A.
The development of property shall conform with zoning, subdivision and other development-related restrictions established by the Town of Riga. It shall also conform with all regulations established herein as well as with appropriate laws, rules and regulations established by all governing bodies having or claiming jurisdiction over various phases of the development.
B.
Where a conflict arises between these regulations and those of other agencies, the developer shall make known to the conflicting agencies the area of disagreement and endeavor to have such agencies resolve their differences before proceeding with development.
C.
Although these standards have principally been developed to apply to subdivisions, they shall apply to other developments as well to the extent that the standards are applicable.
A.
The term "utilities" as used herein shall be defined as roads, drains, sewers, water mains and appurtenances thereto, both private and intended to be turned over to the Town of Riga for maintenance and operation.
B.
Utilities shall be designed to conform with the topography of the property and with existing utilities on adjacent streets or property. Developers shall satisfy themselves by preliminary investigation and consultation with appropriate Town officials and authorities having jurisdiction over existing utilities as to the adequacy of adjoining facilities upon which their property must rely for service, most particularly water mains, sewers, drains and culverts and drainage channels. All utilities shall be constructed outside of the pavement area.
C.
Standards for required improvements shall be appropriate for the public use and demand anticipated upon full development, and shall be of sufficient size to accommodate development of proximate areas if these are considered by the Board to be logically served through the subject property.
D.
Developers bear the responsibility of providing sound engineering design of all utilities, subject to the approval of the Town of Riga and the respective authorities having jurisdiction over existing utilities. The design shall be prepared by a professional engineer licensed to practice in the State of New York, who shall have had experience in the design of such utilities. The design shall conform to the requirements set forth herein.
Developers proposing projects for which engineering review of plans is required shall submit plans in accordance with these specifications, in addition to those required by the applicable Municipal Code regulations. The developer shall submit conceptual, preliminary and final subdivision plans as outlined in the sequence of procedures in Article I of this document, application materials specified in the site plan review or specifications of other local laws, as applicable to the project. The Town Clerk can advise which law(s) applies to the development and what information is required. Reference should also be made to the subdivision requirements checklist in § 38-4.
A.
Street arrangement.
(1)
Street systems shall be designed with due regard to the needs for convenient traffic access and circulation; traffic control and safety; access for fire fighting, snow removal and street maintenance equipment; and stormwater drainage and sewage disposal. Streets shall be designed to accommodate the prospective traffic and so arranged as to separate through traffic from neighborhood traffic insofar as it is practicable.
(2)
The streets in contiguous subdivisions shall be coordinated so as to compose a convenient system. Where a subdivision adjoins undeveloped land, its streets shall be laid out so as to provide suitable future street connections with the adjoining land when the latter shall be subdivided. A street thus temporarily dead-ended shall be constructed to the property line and shall be provided with a temporary turnaround of the same dimensions as for permanent dead-end streets if in excess of 200 feet, with a notation on the subdivision plat providing for temporary easements for the turnaround until such time as the street is extended. These same requirements shall apply at the discretion of the Planning Board in those cases where the adjoining land is another section of the same subdivision, and which is not scheduled for development at the same time.
(3)
Streets shall be designed in a manner that will accommodate the existing topography, and all streets shall be laid out so as to obtain as many as possible of the building sites at or above the grades of the streets. Grades of streets shall conform as closely as possible to the original topography. A combination of steep grades and sharp curves shall be avoided.
(4)
Where a development abuts or contains an existing or proposed arterial street or other existing town, village, county or state highway, the Planning Board may require marginal access streets reverse frontage with screen planting contained in a non-access reservation along the rear property line, deep lots with or without rear service alleys or such other treatment as may be necessary for adequate protection of residential properties and to afford separation of through and local traffic.
(5)
Where a development borders or contains an existing or proposed railroad right-of-way or controlled-access highway right-of-way, the Planning Board may require a street approximately parallel to and on each side of such right-of-way, at a distance suitable for the appropriate use of the intervening land, as for park purposes in residential districts, or for business, commercial or industrial purpose in appropriate districts. Such distances shall also be determined with due regard for the requirements of approach grades and future grade separation.
B.
Dead-end streets. Where a street does not extend to the boundary of the subdivision and its continuation is not needed for access to adjoining property, it shall be separated from such boundary by a distance sufficient to accommodate a lot meeting the requirements of the Zoning Ordinance.[1] Reserve strips of land shall not be left between the end of a proposed street and an adjacent piece of property. However, the Planning Board may require the reservation of an easement 30 feet wide for pedestrian traffic or utilities. A cul-de-sac of a minimum right-of-way radius of 70 feet in the case of a street with gutters, or 80 feet in the case of a street without gutters, shall be provided at the end of any permanent dead-end street. Dead-end streets shall be limited in length to five times the minimum lot width required by the Zoning Law for the lots serviced by the dead-end street, not including the required cul-de-sac or turnaround. For temporary dead ends, there shall be provided a suitable turnaround constructed to Town specifications.
[Amended 2-9-2004 by L.L. No. 1-2004]
D.
Street intersections.
(1)
Intersections of arterial streets shall be held to a minimum and spaced at least 1,000 feet apart, and intersections of collector streets by other streets shall be at least 800 feet apart. Cross (four-cornered) street intersections shall be avoided insofar as possible, except at intersections where both streets are at least of collector designation. Between offset intersections there shall be a distance of at least 150 feet. Within 50 feet of an intersection, streets shall be approximately at right angles. In no case shall the angle of intersection be less than 75° without additional channelization. Minimum curb radii shall depend on the intersecting street types and shall be as follows:
| Intersecting Street Types | Minimum Curb Radius (feet) |
|---|---|
| Collector with collector | 35 |
| Minor with collector | 30 |
| Minor with minor | 30 |
| Industrial with collector | 60, with 4.0 feet offset and 60 feet taper (per American Association of State Highway and Transportation Officials - AASHTO) |
(2)
Access streets into the subdivision from an arterial street shall have minimum curb radii of 40 feet. All property corners at street intersections shall be rounded with a radius of 20 feet, or have comparable cutoffs or chords, as the Planning Board sees fit. Within triangular areas formed by the intersecting street lines, for a distance of 75 feet from their intersection, and the diagonals connecting the end points of these lines, visibility for traffic safety shall be provided by exclusions of plantings or structures and regrading, as necessary.
(3)
Grades at intersections should not exceed 2% for a distance of 50 feet from the intersection. From 50 feet to 100 feet, the grades should not exceed 3%.
(4)
Triangles, circles or other traffic channeling islands may be required at intersections where present or anticipated traffic conditions indicate their advisability for traffic control or safety.
E.
Street grading and shoulders. Areas within street rights-of-way shall be graded as necessary to eliminate any slopes steeper than one foot vertical in three feet of horizontal distance. Street shoulders shall not exceed a slope of 10% at right angle to the street center line. Shoulders at least eight feet wide shall be provided on both sides of collector streets. Minor streets shall have a shoulder at least eight feet wide on one side of the street and at least four feet wide on the other. Shoulders and all other unpaved areas within the street right-of-way shall be treated with topsoil and seeded to grass except where noted differently on the Typical Road Section.[3]
[3]
Editor's Note: The Standards for Road/Street Design table is located at the end of this chapter.
F.
Sidewalks. Concrete or asphalt sidewalks shall be provided in locations where they are deemed by the Planning Board to be appropriate and in the interest of public safety or convenience and in accordance with the Typical Road Section.[4]
[4]
Editor's Note: The Standards for Road/Street Design table is located at the end of this chapter.
G.
Trees. The developer shall take adequate measures to preserve desirable existing trees in suitable locations within the development. In general, the street right-of-way shall be cleared of existing trees, but occasional existing trees of unusual value may be preserved within the street right-of-way if approved by the Planning Board. New tree plantings are not allowed within rights-of-way, unless requested by the Planning Board. See the Typical Road Section. Tree planting shall be governed by § 38-32 of these requirements.
H.
Lighting. Lighting facilities shall be required along all new streets where designated by the Planning Board. Light spacing, fixtures and underground conduits shall meet with the requirements set forth by the Planning Board and the electric corporation having jurisdiction in the service area.
I.
Street names. All streets shall be named, and such names shall be subject to the approval of the Planning Board and applicable county review agencies. Names shall be sufficiently different in sound and spelling from other street names in the Town of Riga and post offices contiguous to the Town of Riga so as not to cause confusion. A street which is a continuation of an existing street shall bear the same name. Relating street names to features of local historical, topographical or other natural interest is encouraged.
J.
Street signs. Traffic control and street identification signs shall be provided as part of the development. Design and installation of all signs shall be in conformance with the New York State Department of Transportation Manual of Uniform Traffic-Control Devices (MUTCD), latest edition. Unless otherwise approved by the Planning Board, street name signs shall conform to Figure 13-1 of the MUTCD.
K.
Monuments.
(1)
Permanent survey monuments shall be set in the boundary of rights-of-way at intersecting streets, PC and PT of curves, though the PI of short curves may be used instead, where such is practical, at the discretion of the Highway Superintendent and/or the Town Engineer. Monuments shall be placed on one side of the street only and at only one corner of intersecting streets. Adjacent monumented points shall be intervisible.
(2)
Monuments shall be tied into the New York State Coordinate System or other datum acceptable to the Highway Superintendent and/or Town Engineer. Monument locations shall be shown on the subdivision plat; field notes of ties to monuments or a tie sheet shall be submitted to the Town Engineer after installation of monuments.
(3)
Monuments shall be placed so that the scored or marked point shall coincide with the intersection of the lines to be marked, and shall be set so that the top of the monument is level with the surface of the surrounding ground. Monuments shall be readily visible.
(4)
The proposed replacement of any existing monuments shall be clearly indicated on the final plan.
(5)
Iron pin markers shall be set at the beginning and ending of all curves along street property lines; at all points where lot lines intersect curves, either front or rear; at all angles in property lines of lots; and at all corner lots. Markers shall consist of steel pipe at least 18 inches long and not less than 3/4 inch in diameter.
(6)
Monuments shall be of stone or concrete and not less than 4 inches in diameter or square, and not less than 42 inches long or to the top of underlying rock. Concrete monuments shall be reinforced with steel rods, and a plug, brass plate or pin shall serve as the point of reference. If stone, a drilled hole shall serve as the point of reference and a magnetic rod or other suitable metal shall be placed adjacent to the monument to allow for recovery.
L.
General street improvements. In addition to the required improvements specifically referred to elsewhere in these regulations, subdivision plats and other developments shall provide for all other customary elements of street construction and utility service which may be appropriate in each locality as determined by the Planning Board upon consultation with the Town Engineer. Such elements may include but shall not be limited to street pavement, gutters, stormwater, inlets, manholes, curbs, sidewalks, streetlighting, water mains, fire hydrants, fire alarm signal devices and sanitary sewers. Underground utilities within the street right-of-way shall be located as required by the Highway Superintendent and/or the Town Engineer, and underground service connections to the street right-of-way of each lot shall be installed before the street is paved. All street improvements and other construction features of the development shall conform to the Town specifications which may be established from time to time and shall be subject to approval as to design, specifications and construction by the Highway Superintendent and/or the Town Engineer.
M.
Highway frontage.
(1)
To promote and protect the public health, safety and welfare, it shall be the policy of the state, county and Town to control the number of entrances and exits onto and off of highways.
(2)
This policy is adopted toward the end that safer highways shall result, more cohesive neighborhoods shall be developed and abutting property owners shall not be unduly and unnecessarily inconvenienced in the future when it becomes necessary to widen highways to accommodate greater traffic flows.
(3)
The Town Planning Board shall from time to time, as part of the process of approving sketches, maps, plots, plats or plans, require that the applicant grant to the Town of Riga such easements as are required to provide access to contiguous properties onto a public highway via frontage or service roads, common driveway or such other roadways as are required so that the number of entrances and exits onto and off of state, county and Town highways are not increased.
N.
Widening of existing street right-of-way. Where a subdivision or other development adjoins an existing street which does not conform to the right-of-way standards given in the table entitled "Standards for Road/Street Design"[5] in these regulations, the developer shall dedicate whatever additional right-of-way width is necessary to provide, on the development side of the normal street center line, a width which is equal to at least 1/2 of the minimum standard width for the respective type of street.
[5]
Editor's Note: The Standards for Road/Street Design table is located at the end of this chapter.
O.
Road sections. The road sections provided in this chapter shall be used for the various road sections allowed in the town.
P.
Nonresidential subdivisions. Standards for streets in nonresidential subdivisions and other developments with an internal circulation network shall be appropriate for the use intended and shall be established by the Planning Board upon advice by the Town Engineer.
Q.
Adjoined drives. The Planning Board will review all adjoined drives in relation to access, ability to support traffic loads, traffic circulation, drainage and maintenance. All private drives shall be marked with an approved sign for adequate identification for emergency and fire situations. The conditions and standards for private drives are as follows:
R.
Watercourses. Where a watercourse separates a proposed street from abutting property, provision shall be made for access to all lots by means of culverts or other structures of design approved by the Town Engineer.
S.
Topping. All dedicated roads shall set over the winter months prior to the final application of topping material. The top material shall be installed at a time of year and mix type approved by the Town Engineer.
T.
Withholding certificate of occupancy. A certificate of occupancy shall not be issued until the binder course is installed on all roads. For those developments calling for sidewalks to be constructed, a certificate of occupancy shall not be issued until the sidewalk construction is completed (those sidewalks which affect or are affected by the certificate of occupancy requested).
A.
General policy.
(1)
An adequate and comprehensive drainage system shall be provided to convey the stormwater runoff originating within and outside the subdivision in accordance with the natural direction of runoff for the total upland watershed area affecting the subdivision. Such drainage systems shall have sufficient capacity to accommodate the potential future runoff based upon the probable land use and ultimate development of the total watershed area upland of the subdivision.
(2)
Particular attention should be given to storm drainage facilities. These facilities shall be designed to take the runoff from streets, lawns, paved areas and roof areas. Full engineering attention shall be given to the interception and conveyance of stormwater by the street drainage system, a system of back-lot-line drainage swales and main drainage channels and pipes through the subdivision.
(3)
The preservation and improvement of natural watercourses is important to the overall drainage plan in the Town of Riga. When developing a site that has a natural watercourse (numbered tributary), this watercourse should be designed as directed by the Highway Superintendent or Town Engineer. Improvements shall be performed and paid for by the developer as part of the development costs. The developer shall reference the town's Environmental Protection Overlay District (EPOD).
(4)
No developed area shall discharge stormwater into adjacent culverts and channels at a rate greater than what occurs under a natural, undeveloped condition.
(5)
The flow capacity of channels and culverts immediately downstream from a development does not necessarily govern the adequacy of the total drainage system downstream.
(a)
Proceeding downstream in any given drainage basin (and therefore from any given development), the area contributing to any drainage channel is increasing.
(b)
Culverts and channels downstream from a development may be able to handle the total runoff from that development alone, but this does not imply that said channels and culverts can handle the total runoff to that location.
(6)
The fact that downstream facilities are inadequate prior to development, and therefore flood at certain times, does not imply that increasing the frequency at which they will flood by allowing additional runoff from a development will be acceptable.
(7)
Stormwater leaving the site shall be discharged to a recognized drainage course via easements dedicated to the town.
B.
Drainage easements.
(1)
Drainage easements shall be conveyed where road runoff must cross private property. Easement width is to be established by the Town Engineer and Highway Superintendent.
(2)
Easements shall be provided along all natural watercourses and dedicated facilities. Additional easements may be required to maintain drainageways where deemed necessary by the Town of Riga. Easement width is to be determined by the Town Engineer and Highway Superintendent.
(3)
The Planning Board may require downstream easements. The developer must demonstrate that effort was made in good faith in trying to obtain drainage easements. Certified letters are acceptable proof.
C.
Drainage computations.
(1)
Stormwater drainage computations necessary to determine runoff rates for existing and developed conditions shall be performed using methods accepted by the Soil Conservation Service (SCS). Design of major stormwater conveyance systems and detention shall be sized as determined by the contributing watershed area. The developed condition storm for the return period and contributing watershed area noted below shall be the basis for design:
(2)
Design of storm sewers for the development may be performed by the Rational formula, using the ten-year developed condition storm as a basis for design. The minimum coefficient of runoff C to be used shall be 0.40 for developed conditions. Time of concentration to the first inlet shall be determined using the included SCS nomograph and shall be taken as not more than 15 minutes. Rainfall-intensity curves have been included in this document for use in computing anticipated stormwater runoff rates (design graphs and charts are located at the end of this chapter.)
D.
Engineering report and plans.
(1)
A complete engineering report package shall be provided to the Town Engineer for review. It shall include the following information:
(a)
Report.
[1]
Detention pond sizing calculations.
[2]
Outlet control design calculations.
[3]
Stage-storage-discharge information for the pond and outlet structure.
[4]
Pond routing calculations for the design storm and lesser storms.
[5]
Emergency spillway sizing calculations.
[6]
Undeveloped and developed drainage area maps with the path used for time of concentration clearly delineated.
[7]
Additional information as required by the Town Engineer.
(b)
Plans.
[1]
Proposed grading of pond.
[2]
Emergency spillway location and length.
[3]
Path of drainage from site to a bed and bank stream.
[4]
Details of pond, outlet structure, spillway and actual proposed channel sections with all critical elevations labeled.
[5]
A section through the pond with berm side slopes, pipes (may be incorporated with Subsection D(1)(b)[4]) and key elevations.
(2)
The minimum size pipe used for dedicated storm drains shall be 12 inches diameter; except catch basin crossovers, which may be eight-inch pipe.
(3)
Drop inlets shall be spaced at intervals of not over 300 feet, at low points and at intersections. They shall conform with the detailed drawings included in Article IV, Construction Details.[2] Drop inlets shall be connected to the storm system with a manhole.
[2]
Editor's Note: Art. IV, Construction Details, is on file in the office of the Town Clerk.
(4)
Manholes shall be provided along the drain piping network. Manholes shall be designed as follows:
(a)
Manholes shall be placed at intervals of 300 feet maximum.
(b)
The piping of drainage through a manhole shall be such that the crown of the pipe leaving the manhole will be 0.10 feet lower than the pipe entering the manhole.
(c)
No drop manholes will be permitted.
(d)
Manhole tops shall be accurately designed to conform to finished grade.
(e)
All three-way manholes shall be a minimum of 5 feet in diameter. All special manholes shall be reviewed by the Town Engineer. The invert of a three-way manhole will have a minimum radius of 1/2 the diameter of the manhole. No T-intersections will be accepted.
(5)
Storm drains shall be constructed as outlined under Article III, Construction Specifications, of this chapter. Drains shall be designed with straight-line grade and alignment between manholes. Sufficient grade shall be provided to prevent settling of grit, insofar as practical.
(6)
Open channels serving as main drainageways normally will not be accepted by the municipality where, by engineering design, it has been established that the future flow (under conditions of full development) could be conveyed in a pipe system having an N value of 0.013, up to and including a size of 48 inches in diameter or equivalent. Developers and their engineers bear the responsibility of providing technical design data in this regard which shall be submitted to the municipality and it's engineer, whose approval or disapproval of this data shall be final and binding. Easements along natural or open watercourses shall be provided as specified in § 38-22D.
(7)
The developer and his engineer shall be responsible for furnishing, as part of their plans to be presented before the Planning Board, full and sufficient details of all hydraulic structures. This includes but is not limited to cross sections of drainage channels, details of head wall construction, erosion control structures, special manholes, detention facilities and all such other items as may be necessary to establish fully the methods and materials to be followed in construction.
(8)
The developer and his engineer shall so design the vertical control of their subdivision that surcharge of storm drainage systems will not cause a backup or flooding of cellars. This will normally require that cellar drains not be connected to the storm drainage system unless the cellar floor is higher than pavement grade in order that the street drain system can run fully surcharged, or the cellar drainage discharges through a sump pump and check valve.
(9)
In the design of a storm drainage piping system, an N value of 0.013 shall be used for smooth pipe and an N value of 0.024 shall be used for corrugated metal pipe, unless the corrugated metal pipe is of the smooth-flo type, in which case an N value of 0.013 may be used. All CMP shall conform to the New York State Department of Transportation (NYSDOT) Standards for Recommended Minimum 70-Year Design Life.
(10)
Storm drain piping conveying drainage along side lot lines shall extend to the rear lot line or to the main channel to which the drain is discharging.
(11)
All culverts placed in existing streams shall be designed to ensure that the upstream water surface elevation will not be increased by placing this structure in the path of flow.
(12)
In order to maintain structural strength, drop inlet structures shall not contain more than two main stormwater conduits. (Four-inch weep drains are not considered main conduits.)
(13)
On certain projects there may be key elevations which must be adhered to, as determined by the Town Engineer. These key elevations may be finished floor, lowest architectural opening or basement floor elevations. The developer's engineer shall certify these key elevations in writing prior to the issuance of a certificate of occupancy.
(14)
Drop inlets within gutters shall be placed with the intent that they do not lie within the vehicular traffic area of drives and/or roadways.
(15)
All three-way manholes shall be five feet in diameter or greater, depending upon the size of the pipe. The invert of a three-way manhole will have a minimum radius equal to 1/2 the diameter of the manhole. No T-intersections will be accepted.
E.
Stormwater detention basins.
(1)
General.
(a)
The Town has determined that stormwater detention basins will be required because continual upstream development tends to overtax both downstream natural watercourses and man-made drainage facilities. In addition, increased rates of stormwater runoff cause environmental problems downstream such as highly erosive velocities, flooding and overtopping of the banks. Consequently, it has been determined to insist upon detention basins and to have these detention basins designed in a manner compatible with the particular problem. Due to the topography of the Town of Riga, detention facilities will be offstream ponds.
(b)
While the Town reserves the right to establish particular parameters in each individual instance, the general philosophy is to permit runoff from any particular development at a rate no more than would normally occur under a natural, undeveloped condition for all storms. That is, the Town generally agrees that property owners along the downstream channel should be prepared to accept a rate of discharge from the upstream areas equivalent to the discharge from the upstream area under a natural condition.
(c)
However, the Town definitely reserves the right to establish other, more restrictive parameters. For example, if the downstream area has been subjected to floods in the past, even while the upstream areas were not developed, and if the Town deems it desirable and appropriate to remedy this situation, it may, at its discretion, require an impoundment area of a size and type, as well as storm sewers and culverts, which can assist in rectifying the downstream flooding situation.
(d)
Detention pond facilities are to be designed and built to standards discussed with and approved by the Town and its engineer. Attention shall be given to providing facilities which are aesthetically pleasing, of a permanent nature, safe and requiring minimum maintenance.
(e)
The developer is responsible for providing and transferring to the Town permanent easements of a location and type adequate to encompass and to service and maintain the facilities. Such easements are to be approved by the Town Board prior to final subdivision approval.
(2)
Access for maintenance. If not adjacent to a public right-of-way, an easement shall be provided for access for purposes of maintaining the detention/retention basin. The easement shall be sized and located such that construction equipment can reach the site.
(3)
Design. The detention facility is made of three structures: the detention pond, outlet control structure and emergency spillway. The three structures work together as one system.
(a)
Detention pond.
[2]
Sizing the detention pond shall be done using the Soil Conservation Service (SCS) technical release No. 55 (TR-55). Computations shall be based on twenty-four-hour duration rainfall as supplied by the U.S. Weather Bureau. Routing computations shall be performed demonstrating the adequacy of the detention facility and outfall structure.
[3]
Individual commercial sites less than three acres in size that require a detention pond due to the amount of impervious area may size the pond using the Rational Method.
(b)
Outlet control structure.
[1]
The control structure shall be designed as a multifrequency structure since more drainage is generated in all storms from a developed site. The control structure should be designed to attenuate the lesser storms as well as the design storm.
[2]
The outfall pipe (through the berm) shall be designed to pass the design storm (as outlined in Subsection E(3)(a), Detention pond), with a headwater 0.5 feet above the top of the control structure. The minimum pipe size shall be eight inches in diameter.
[3]
The control structure shall have a trash rack and anti-vortex device.
[4]
The outlet structure should be placed on a suitable base to ensure that the structure does not become buoyant under high water conditions prior to the structure overtopping.
[5]
The minimum size of a control structure shall be a diameter of 36 inches.
[6]
The riser tube shall be constructed of reinforced concrete with precast flow orifices.
[7]
If site constraints do not permit the use of a riser tube arrangement, the developer's engineer may discuss an alternate design with the Town Engineer.
(c)
Emergency spillway. An emergency spillway shall be provided on all detention ponds to avoid embankment overtopping and subsequent embankment failure.
[1]
Emergency spillways should be designed using the developed flow for the next larger design storm than the detention pond (e.g., detention pond, twenty-five-year; emergency spillway fifty-year), and using the following equation: Q=3.0 Lh3/2.
[2]
All emergency spillways should be placed in an area of cut so as to minimize the possibility of dam failure. In no case shall emergency spillway sections be designed for or constructed in the embankment section.
[3]
The top of the dam elevation shall be set a minimum of one foot above the free water surface passing over the emergency spillway.
[4]
Tops of embankments shall be designed and constructed level to avoid low points in the embankment section.
F.
Stormwater ground recharge.
(1)
In certain areas where development does not offer positive surface stormwater discharge, the Town may allow stormwater ground recharge.
(2)
The New York State Department of Environmental Conservation may place certain constraints on systems using ground recharge of stormwater. Some of the possible constraints (but not limited to these) are:
(3)
If preliminary approval is given to the concept for a particular location, the developer shall follow the procedure described below. Final approval of the system shall be at the discretion of the New York State Department of Environmental Conservation, the Town Engineer and the municipality.
(4)
The developer shall retain a competent soils engineer to provide a detailed report and plan showing the quantitative and qualitative ability of the aquifer to receive ground recharge. More specifically, the report shall include soil permeability data, geologic features, gradation and soil sampling data, and soil exploration and testing. Adequate logs of test pits and bore holes shall be provided to define the limits of the aquifer where recharge would be made.
(5)
The ground recharge facility shall include a retention facility where adequate settling of soils can occur and storage can be provided. Discharge to the recharge area via a trickle tube or other piping should be shown. Other design data including fencing, useful life of system, infiltration piping and operation and maintenance costs are required and shall be included and made part of the report.
(6)
Stormwater district formation. A stormwater district formation, with the approval of the Town Board, shall be required for all new developments that contain detention basins, groundwater recharge and storm sewers and main channel improvements including straightening, bank stabilization and removal of debris.
A.
In order to ensure that the surrounding land and watercourses will not be subjected to siltation or erosion, the Planning Board shall require the developer to follow certain erosion control practices. The developer shall consult with the Town Engineer to determine whether or not the required procedures are to be put into practice. Such procedures should include:
(1)
Installing and maintaining temporary sedimentation basins at the point or points of stormwater discharge from the property.
(2)
Exposing the smallest practical area of land at any one time during development.
(3)
Provision for temporary vegetation and/or mulching to protect critical areas.
(4)
Provision for adequate drainage facilities to accommodate effectively the increased runoff caused by changed soil and surface conditions during and after development. The developer's engineer shall show, as part of the submitted plans, the interceptor swales and sedimentation basins along the lower edges of all developments. Significant topographic data and design grades for the swales shall be shown on the plans.
(5)
Fitting of the development plan to the topography and soils so as to minimize the erosion potential.
(6)
Retention and protection of natural vegetation wherever possible.
(7)
Installation of permanent final vegetation and structures as soon as could be practicable.
(8)
Provision of adequate protective measures when slopes in excess of 10% are graded, and minimizing of such steep grading.
(9)
Prohibition of stripping of existing ground cover until interceptor swales and sediment sinks have been installed by the developer and approved by the town.
(10)
Requirement that the developer shall routinely muck-out sediment sinks and interceptor swales to provide full capacity.
(11)
Interceptor swales and sedimentation basins constructed on all developments prior to the actual mass grading taking place. The purpose of these swales and basins is to prevent off-site siltation.
B.
There should be sufficient topographic data, sufficient design grades on swales and basins and a sequence of operations to enable the contractor to provide for the facility without causing off-site siltation.
C.
At the time the facilities are constructed and prior to the mass grading operations, developers shall contact the Town Engineer so that an inspection can be made in the field to assure that all siltation facilities are constructed prior to the actual mass grading.
D.
In the event that there are areas within a development which are to be preserved or left in their natural state or forever wild and siltation facilities must be constructed, the intent therefore shall be to protect these areas, in addition to off-site areas.
E.
No topsoil or subsoil shall be removed from the site unless approved by the Town Board.
A.
Flood hazard prevention shall include the control of soil erosion of land surface and drainage channels and the prevention of inundation and excessive groundwater seepage by comprehensive site grading and the establishment of adequate elevations of buildings, building openings and roadway above the observed, anticipated or computed water levels of storm sewers, streams, channels, floodplains, detention basins and swales.
B.
Particular attention shall be paid to development in the vicinity of creeks and their floodplains. No alteration of the existing characteristics of the areas shall take place without the specific approval of the Town as to the adequacy of the protective measures taken, if any, and the effects of such development on upstream and downstream reaches of the watercourse and adjacent properties.
C.
All development proposed within the special flood hazard area as defined by the Federal Insurance Administration shall comply with the various regulations set forth by the Federal Insurance Administrator, when applicable.
The developer shall take all necessary measures to control dust resulting from his construction operations and to prevent spillage of excavated material on public roads. When directed by the Town Building Inspector, the developer shall apply calcium chloride and/or water where directed and in such quantities and at such frequencies as may be required to control such dust and prevent it from becoming a nuisance to the surrounding area.
A.
Sanitary sewer facilities.
(1)
Sanitary sewers shall be provided wherever the proximity of existing sewers make it possible. They shall be designed in accordance with the standards set forth by the New York State Department of Environmental Conservation, Town Engineer and such other agency as has jurisdiction over design, construction and/or final operation or maintenance. The developer shall be responsible to secure the approval of the appropriate agency to connect the new sanitary sewers to the agency's existing sewers, prior to start of construction.
(3)
In designing sewer profiles, consideration shall be given to the relationship of house elevation to sewer elevation to assure the installation of laterals on at least a 1% grade (1/8 inch per foot) for six-inch laterals and 2% grade (1/4 inch per foot) for four-inch laterals.
(4)
Sanitary manhole spacing is to be no greater than 300 feet maximum.
(5)
The sanitary sewer profile shall be designed so that there is at least 0.1 of a foot drop within the manhole but not greater than two feet. If the drop through the manhole is two feet or greater, there shall be an outside drop provided. See details for drop manhole design.
(6)
All three-way manholes are to be five inches in diameter or greater depending on the size of the pipe.
(7)
The invert of a three-way manhole shall have a minimum radius equal to 1/2 the diameter of the manhole. No T-intersections will be permitted.
(8)
All sanitary sewage facilities shall be subject to the approval of the municipality during all stages of design and construction.
B.
Sanitary septic systems. Where sanitary sewers are not available or where the proposed development is too distant from existing facilities for public sewers to be provided economically, development along existing highways may be permitted on the basis of providing septic tanks and leach beds. Such facilities shall be designed in accordance with current policies and directives of the NYSDEC and the Monroe County Health Department.
A.
The Monroe County Water Authority (MCWA) has jurisdiction over all water mains, permits and appurtenances. Concurrent with the submission of the preliminary plan, the developer shall submit a data sheet providing sufficient calculations relating to static and residual pressure, date of flow tests, recorded flow, description of existing water mains and a discussion on anticipated fire protection and domestic pressures and volumes within the development.
B.
Waterlines shall be used wherever the proximity of waterlines make it possible. The waterlines and appurtenances shall be designed in accordance with the standards set forth by the Monroe County Water Authority.
C.
These facilities shall be subject to the approval of the Town and the MCWA during all stages of design and construction.
D.
The criterion of design will normally be that pipes shall be sized to obtain the required fire flow at the critical point in the development while satisfying the average daytime domestic draft, and in no case shall be less than ISO standards.
E.
Where public waterlines are installed, all such waterlines shall be located between the curbline and the property line within any street right-of-way.
F.
Where public water is not available, the developer may be required to install fire suppression ponds or similar on-site storage to aid fire protection.
A.
The finished grade elevation at the front building line of a residential or commercial structure shall be a minimum of two feet above the elevation of the center line of the public street in front of such structure; provided, however, that where the structure is setback a distance of at least 1.5 times the minimum set back allowed by zoning, and/or where natural drainage patterns would be better served by draining away from the street, the Planning Board may, in its discretion, waive this requirement, stating its finding and determination on the record. In any case, however, the approved grading and drainage shall be so designed as to ensure that positive drainage flow is maintained away from the building foundation.
[Amended 2-9-2004 by L.L. No. 1-2004]
B.
Provisions shall be made for the piping of roof and cellar drainage into the street drainage system. The developer and his engineer shall investigate draining the cellars and foundations by gravity. In lieu of this, the developer may request from the Town permission to drain the cellars with sump pumps and appropriate double check valves.
C.
In special conditions, where topography permits or dictates, cellar drainage may be conveyed to main drainage swales where it can be deposited if no nuisance will be caused or created to abutting or downstream property owners. In such instances, the cellar floor shall be so designed as to be above the level of the project design flood to assure no backup or flooding of the cellar.
D.
No laundry, sanitary or kitchen wastes shall be discharged to a storm drainage system. Further, no drain connections from garages or driveways shall be permitted to enter drainage swales where soap suds and detergents from car-washing operations could cause a nuisance to abutting or downstream property owners.
F.
No cellar drainage, roof drainage, drain connections from garages and/or any other stormwater shall be conveyed to a sanitary sewer system.
A.
All design for pipe lines for sanitary sewers and storm drains shall be based on the earth loading occurring at the transition width. Designers shall assume a Class C bedding (load factor 1.5) and safety factor of 1.5 in their design calculations. (except for R.C.P. S.F. = 1.0). Specifications for construction shall stipulate a granular bedding (Class C) as indicated on page 212 of the WPCF Manual of Practice No. 1, "Design and Construction of Sanitary and Storm Sewers, 1969 Edition." The granular bedding shall be No. 1 and No. 2 (approximately a 50-50 mixture) crushed stone as specified in the NYSDOT specifications, Section 703-0201, Crushed stone. Also, unless substantiated by test results, the designer shall assume the following:
| W = 120 pound per cubic feet | |
| KU = Ku = 0.13 (curve D, pg 189 WPCF Manual) | |
| rsdP = 0.5 Ku = Ku = 0.165 (pg 191, WPCF Manual) |
B.
Shaped trench bottoms will not be permitted.
A.
It shall be the responsibility of the developer to furnish easements to the Town of Riga, as required, for the installation and permanent operation of drains, sewers, mains or access roads where required.
B.
These easements shall be prepared prior to the approval of the detailed plan and be so written as to be contingent upon the town's approval of said plan. developers bear the responsibility for preparation of the easement maps and assuring their transfer to the Town of Riga and recording in the County Clerk's office. The Town of Riga reserves the right to require easements for anticipated future utilities where, in the opinion of the Town Board and/or the Town Engineer, such easements are justified by the estimated rate of growth of the area in question.
C.
Easements across lots or centered on rear or side lot lines shall be provided for utilities where necessary and shall be at least 20 feet in width. Where multiple utilities are present, the easement may be changed to 30 feet. Easements along common property lines may be split evenly between lots. In all cases easement width shall be adequate to accommodate maintenance equipment in performing tasks and have access from a dedicated highway sufficient to permit passage of maintenance equipment.
D.
Where a development is traversed by a watercourse, drainageway, channel or stream or contains a pond which crosses a property line, there shall be provided a stormwater easement or drainage right-of-way conforming substantially with the line of such watercourse and of such width as will be adequate to preserve natural drainage and to accommodate the twenty-five-year flood area of such watercourse. Access on easement from a dedicated highway sufficient to permit passage of maintenance equipment should be provided. Piping of the watercourse may be provided. In no case shall the easement be less than 20 feet in width. The Planning Board reserves the option to modify or waive these requirements if appropriate, along with the easement dimensions.
All utilities shall be underground, including electric, telephone and cable television. This regulation shall be enacted in accordance with the New York State Public Service Commission ruling (tariffs) for all public utilities. Utility companies shall obtain the necessary approvals and permits prior to starting construction.
A.
Sketch plan data. A rough scaled sketch layout shall be drawn on paper at a standard scale of not more than 200 feet to the inch. It shall be clearly marked SKETCH PLAN and shall show the following information:
(1)
The name of the proposed subdivision, the name and address of the subdivider(s) and a clear written statement of the developer's intent.
(2)
The North point, scale and a general location map showing the relation of the proposed subdivision to major roads and intersections in the area.
(3)
All existing structures, wooded areas, floodplains and wetlands, streams and other significant physical features which are in the subdivision and/or within 200 feet of the subdivision. Contours shall also be indicated at intervals of not more than five feet.
(4)
The proposed pattern of lots, street layout, recreation areas, drainage systems, sewage disposal and water supply within the area to be subdivided. State the distance to the nearest public water service and sewage service if lots are designed with septic systems and well water. Show the path of development stormwater drainage to a bed and bank stream.
(5)
If the proposed subdivision is not to be served by a public sewer system, the approximate location and method for sewage disposal should be on the plans.
B.
Preliminary and final plan data.
(1)
A scaled layout shall be drawn on paper at a standard scale of not more than 60 feet to the inch. It shall be clearly marked PRELIMINARY or FINAL PLAN and shall show the following information:
(a)
The name of the proposed subdivision, the name and address of the subdivider(s) and a clear written statement of the developer's intent.
(b)
The North point, scale and a general location map showing the relation of the proposed subdivision to major roads and intersections in the area.
(c)
All existing structures, wooded areas, floodplains and wetlands, streams and other significant physical features which are in the subdivision and/or within 200 feet of the subdivision. Contours shall also be indicated at intervals of not more than one foot.
(d)
The proposed pattern of lots, street layout, recreation areas, drainage systems, sewage disposal and water supply within the area to be subdivided. State the distance to the nearest public water service and sewage service if lots are designed with septic systems and well water. Show the path of development stormwater drainage to a bed and bank stream.
(e)
If the proposed subdivision is not to be served by a public sewer system, the approximate location and method for sewage disposal should be on the plans. The following information shall be provided at the discretion of the Planning Board:
[2]
Deep-hole test data to include:
[a]
The date of the test.
[b]
The location of the test hole(s).
[c]
The type of soil and thickness of each layer.
[d]
The level of mineral deposits. If no mineral deposits are encountered, state "none."
[e]
The level of groundwater. If no groundwater is encountered, state "none."
[f]
The level of solid rock. If solid rock is not encountered, state "none."
[g]
The name of the Monroe County Health Department witness.
(3)
Submission requirements for other types of developments shall be in accordance with applicable ordinances.
C.
Drawing sizes and dimensions.
(1)
Standard engineering drawing sizes shall be used to adequately present the plan dimensions of no smaller than 40 feet to the inch for one to five lot subdivisions, and building additions.
(2)
Dimensions for large projects of over five lot subdivisions, commercial and industrial projects shall be no smaller than 50 feet to the inch.
(3)
Large area maps depicting drainage and floodplain areas may be shown at 200 feet to the inch.
(4)
Standard drawing sizes are:
| Size | Dimensions (inches) | |
|---|---|---|
| A | 8 1/2 by 11 | |
| B | 11 by 17 | |
| C | 17 by 22 | |
| D | 22 by 34 | |
| E | 34 by 44 |
D.
Subdivision Plat Record Plan. Unless the County Clerk specifies otherwise, the plat shall be 22 inches by 34 inches in size and shall be drawn at a minimum scale of 50 feet to one inch unless otherwise approved. Where more than one sheet is required to show the entire development, a key map showing all sections shall be provided. The following information shall be clearly shown:
(1)
The title of the sheet, including the name and address of the subdivider, owner and developer and all required signatures. (Where the developer or owner is a corporation, a statement of corporate ownership and officers shall be submitted to the Planning Board at the preliminary stage.)
(2)
The North point, graphic scale and date.
(3)
The boundaries of the subdivision and information to show the location of the subdivision in relation to surrounding property and streets, including names of owners of adjacent land or names of adjacent subdivisions. In whatever manner that is practical, the subdivision boundary shall be referenced from two directions to establish USGS monuments or New York State Plane Coordinate monuments. In the event that such monuments have been obliterated, the subdivision boundary shall be referenced to the nearest highway intersections or at least two previously established monuments of subdivisions of public lands. Any combination of types of reference ties may be accepted which would fulfill the requirement of exact measurements from the subdivision boundary to reference points previously established.
(4)
The lines of existing and proposed streets within the subdivision and the lines of existing or approved streets on adjoining properties.
(5)
The names of existing and proposed streets.
(6)
The lines and dimensions of proposed lots, which shall be numbered and shall have their area in square feet indicated.
(7)
The lines and purposes of existing and proposed easements immediately adjoining and within the subdivision.
(8)
The lines and dimensions of all property which is offered or to be offered for dedication for public use, with the purpose indicated thereon, and of all property that is proposed to be reserved by deed covenant for the common use of the property owners of the subdivision.
(9)
The location of monuments to be placed within the subdivision.
(10)
The locations of any municipal and zoning boundary lines within the subdivision.
(12)
Certification by a licensed professional engineer and a licensed land surveyor as evidence of professional responsibility for the preparation of the plat and a place for the liber and page where filed.
E.
Subdivision Grading and Drainage Plan. This plan shall be on a separate sheet of the same size and scale as the plat and provide the following information:
(1)
Contours of existing grade at intervals of not more than one foot. Intervals greater than one foot may be allowed depending on the character of the topography. The contour is to extend a minimum of 200 feet beyond property limits.
(2)
The location of all buildings proposed.
(3)
The number of each lot.
(5)
The location and means of controlling erosion within the project limits.
(6)
Slope stabilization details.
(7)
Flood hazard prevention.
(8)
Stormwater detention basins, retention basins and ground recharge facilities.
(9)
Certification by a licensed professional land surveyor of the finished grades after completion of grading.
F.
Subdivision Utility and Street Plan.
(1)
This plan shall be on a separate sheet of the same size and scale as the plat and provide the following details:
(a)
Complete plans and profiles of all proposed sanitary and storm sewers, including:
(b)
The location and details of all other facilities, including water mains, gas mains, telephone and electric.
(c)
The location of all existing utilities in and adjacent to the site to be developed.
(e)
Details of erosion and slope stabilization measures, where applicable.
(f)
Any other details pertinent to site construction.
G.
Other data required by the Municipal Code shall be included as part of the subdivision final plans. The initial plans shall be modified to reflect as-built conditions.
