A. 
A hydraulic design report prepared by a licensed professional engineer containing design information for all highway drainage structures, storm sewers and channels must be submitted to the Town Engineer and the Town Superintendent of Highways. This report should contain the basic design data required to arrive at each drainage structure size, such as design frequency, flow rate, grade, velocity, area and method used to determine the waterway size. A consideration should also be given to anticipated (if any) future development and any urbanization of the area.
B. 
There should be enough information shown on the plans and profile to properly construct all the required drainage facilities. Type and size of culvert, end treatments of inlets and outlets, the gauge of metal pipe or class of concrete pipe, invert elevation each inlet and outlet, ditch and channel section, gutters, channel protection and alignment of ditches are some of the information required on the plan and profile.
A. 
The developer shall dedicate to the Town by recordable instrument all easements as shown on the plans.
B. 
All drainage easements must have a minimum width of 30 feet and shall include the right to enter upon said property for the purposes of installing, maintaining and repairing the ditches and pipes as placed in such easements. It is the policy of the Town that all storm drainage be enclosed in drainage pipe, and all easements shall contain a provision providing for the right to install underground pipes and to discharge stormwater therein. The developer shall also install in said easements pipe of a size sufficient to provide for present and future runoff.
C. 
Where it is proposed that stormwater be drained from the highway or from other lands of the developer to the perimeter of the developer's property, easements shall be provided in recordable form and free and clear of all liens from the adjoining owners permitting the discharge of stormwater drainage onto such adjoining lands.
D. 
The developer shall provide an attorney's certificate of title indicating that the above mentioned easements and rights to discharge surface water are free and clear of all liens.
A. 
Storm drain and culvert pipe may be corrugated metal, reinforced concrete or ADS with a minimum diameter of 12 inches.
B. 
Round corrugated metal pipe and pipe arches, fully bituminous coated, and end sections shall conform to Section 707-02 of the current Standard Specifications of the New York State Department of Transportation, with the following exceptions:
(1) 
All collars or connecting bands shall be 12 inches wide and shall be furnished with bolts six inches long.
(2) 
Round corrugated aluminum pipe, pipe arches and end sections shall conform to Section 707-13 of the current Standard Specifications of the New York State Department of Transportation.
(3) 
Reinforced concrete pipe shall be manufactured with slip joints or bell and spigot joints.
(4) 
Each piece of reinforced concrete pipe shall be marked with the specification number and the date of manufacture.
(5) 
Reinforced concrete pipe shall be sealed with flexible watertight elastomeric gaskets and approved bituminous sealers or plastic sealers. Bituminous or plastic sealants shall be applied at the time the pipe is being laid to line and grade. Such sealants shall be installed with the sealant manufacturer's instructions so that the joint is completely filled with the sealant.
(6) 
Round ADS pipe shall conform to the current Standard Specifications of the New York State Department of Transportation.
(7) 
All collars or connecting bands shall be furnished with plastic ties and installed in accordance with the manufacturer's recommendations.
(8) 
Corrugated metal or ADS pipe and pipe arch connections for making field joints shall consist of corrugated bands so constructed as to lap on equal portions of each culvert section to be connected.
(9) 
Height of the fill and pipe classes shall be designed to meet the minimum requirements of H-20 highway loading, which is equivalent to a truck with two loaded axles carrying 16 tons of load each.
A. 
Whenever a drain begins or ends in an open ditch, pond or stream, inlet and outlet ends shall be designed to protect embankments and channels and to preserve the hydraulic efficiency of the pipe.
B. 
The following end treatments shall be used for drainage pipes:
(1) 
Prefabricated end sections.
(2) 
Headwall and wingwalls with or without concrete aprons.
(3) 
Beveled pipe ends.
C. 
Prefabricated end sections shall be of similar material and construction to the pipe. End sections shall be connected to the pipe in the same manner as pipe sections are connected.
A. 
Where underdrains are required, they shall be designed by a professional engineer and approved by the Superintendent of Highways and the Town Engineer.
B. 
Underdrains may be perforated metal or ADS and placed in trenches and surrounded by material which is both pervious to water and capable of protecting the pipe from infiltration by the surrounding soil. (See Figure 5.[1])
Specifications and drawings on Figures 7, 7A, 7B show the minimum acceptable construction for typical catch basins and curb inlets.[1] Whenever, in the opinion of the Town Highway Superintendent, ground conditions or other circumstances require larger or heavier materials and additional materials, reinforcing or other modifications and improvements in design and construction shall be made as directed by the Town Highway Superintendent at any time prior to paving.
A. 
Location. Catch basins shall be located at all points of change of slope or alignment and at all junction points. Catch basins shall be located in the lows of sag vertical curves as necessary to prevent ponding. At no time shall catch basins be spaced farther apart than 300 feet on slopes up to 6% and 250 feet on slopes over 6% in steepness.
B. 
Construction. All construction and materials shall comply with Section 604 of the current Standard Specification of the State of New York Department of Transportation.
C. 
Installation of pipes.
(1) 
Openings in catch basins around all pipes entering and leaving the basin shall be cut to fit the contours of the pipes as closely as possible. Remaining intercises shall be solidly filled with mortar for the full thickness of the wall. Ends of all pipes shall be cut off flush with the inside surface of the catch basin walls and shall project outside a sufficient distance to allow for proper connection with adjoining pipe section.
(2) 
When the diameter of the effluent pipe is greater than that of the influent pipe, the elevation of the top of the influent pipe shall be no lower than the elevation of the top of the effluent pipe.
(3) 
When the diameter of the effluent pipe is the same or smaller than the influent pipe, the elevation of the invert of the influent pipe shall be no lower than the elevation of the invert of the effluent pipe. In no case shall the top of any influent pipe be more than five feet above the invert of the effluent pipe.
D. 
Curb inlets.
(1) 
Wherever required, catch basins shall be capped with inlets having a minimum frame opening of 30 inches by 30 inches or a type as designated by the Town Superintendent of Highways.
(2) 
Curb-type inlets shall be installed so that the top of the grating shall be no more than one inch below the finished grade of the wearing surface, and the pavement shall be sloped toward the inlet as shown in Figure 7B.[2] Catch basin covers and cast iron curb boxes shall conform to the current Standard Specifications of the State of New York Department of Transportation, Division of Construction, and be designed to carry H-20 highway loading. All catch basins shall be square unless otherwise approved by the Town Superintendent of Highways.
[2]
Editor's Note: Figure 7B is included at the end of this chapter.
E. 
Steps for catch basins. Catch basins having a depth greater than 48 inches from the finished surface to the top of the concrete base shall be provided with steps. The steps shall extend 4 1/2 inches inside the wall of the catch basin. The top step shall not be more than 18 inches below the finished surface. Intermediate steps shall be no more than 18 inches apart. Reinforced plastic steps meeting Section 725-02 of the Standard Specifications, State of New York Department of Transportation, Construction Division, may be used.
[1]
Editor's Note: These figures are included at the end of this chapter.
A. 
With the approval of the Town Highway Superintendent and Town Engineer, open ditches for back lots and side slopes may be used in lieu of storm drain pipes when the grade of the land traversed is flat or when it is desirable to drain and dry up the surrounding area.
B. 
In no case shall the grade of an open ditch exceed 6%. The following guide lines shall be used in treatment of these ditches:
(1) 
Up to 1%: seed and mulch.
(2) 
One percent to 3 1/2%: jute mesh and seed.
(3) 
Three and one-half percent to 5%: sod.
(4) 
Over 5%: riprap.
C. 
Riprap, when called for, shall consist of field stone or rough, hewn quarry stones as nearly cubical in form as is practical, placed upon a slope not steeper than 1:2 and so laid that the weight of the large stones is carried by the soil and not by the adjacent stones. All stones shall weigh 50 to 150 pounds each, and at least 60% of them shall weigh more than 100 pounds each.
D. 
Whenever a drain pipe enters an open ditch, the bottom and sides of the ditch shall be riprapped for a distance of at least 30 feet beyond the end of the pipe.