[HISTORY: Adopted by the Board of Trustees of the Village of LeRoy 9-18-2019 by L.L. No. 1-2019. Amendments noted where applicable.]
A. 
Detention or retention ponds, sedimentation basins and related control measures shall be provided where, in the judgment of the Planning Board, such facilities may be required, or in the best interests of the applicant's land and the surrounding lands, for proper drainage control. Detention or retention facilities shall be designed to control runoff, standing water, and other nuisances caused by excess water collecting in a certain area.
B. 
The Village reserves the right to establish more restrictive requirements depending upon the specifics of each retention or detention pond site plan.
All detention and retention ponds to be located with the Village must meet the following requirements:
A. 
The pond shall be designed to accept runoff at an appropriate return interval based on the project site drainage area and to provide the required detention or retention volume.
B. 
The minimum freeboard above design high water level to the top of embankments shall be two feet.
C. 
Controlled overflow structures shall be provided for flows in excess of the maximum design flow.
D. 
Temporary settling basins or sediment sinks shall be provided and maintained as required by the Village Superintendent of Public Works or the Village Engineer.
E. 
The outlet structure shall be designed to discharge flow as a continuous function of head at a rate not to exceed runoff from the natural, undeveloped site for all flow conditions, with maximum allowable flow occurring at maximum pond depth.
F. 
Trickle tube outlets shall include anti-vortex devices and trash racks.
G. 
Controlled overflows using emergency spillways shall be with spillway crest not less than two feet below top embankment and one foot above design high water level.
H. 
Pond embankments shall be designed with minimum side slopes of one on three.
I. 
Seepage control collars shall be provided on piping passing through embankments.
J. 
The bottom of ponds shall be designed with a minimum longitudinal slope of 0.5%.
K. 
The minimum area for a parcel to allow for a detention or retention pond is two acres.
L. 
The maximum area of any detention or retention pond is one acre.
M. 
The ratio of the area of the detention or retention pond versus the area of the landowner's contiguous land being serviced by the detention or retention pond cannot exceed 1:3. That is, the pond cannot cover more than 1/3 of the contiguous land of the landowner.
N. 
The bank of all ponds must maintain a minimum of 200 feet setback from the boundary line of the parcel.
O. 
There shall be no additional residential buildings on the parcel besides the primary residence.
P. 
No soil excavated from the pond site can be used to raise the elevation of that parcel in a manner that causes stormwater to drain off of that parcel and onto neighboring lands.
Q. 
All other requirements from the New York State Stormwater Management Design Manual dated January 2015, and any amendments thereto, Section 6.1.1, must be met and complied with.
All applications shall be submitted to the Superintendent of Public Works, Village Engineer, and the Planning Board, with a copy sent to all adjacent property owners. All applications shall include proof that the requirements § 92-2A through P are met. All applications shall also include:
A. 
Name, legal address, and telephone number of the applicant.
B. 
Common address and legal description of site.
C. 
Vicinity map.
D. 
Existing and proposed mapping and plans.
E. 
Hydrologic and hydraulic analysis including.
F. 
Preliminary landscaping plans for stormwater treatment practices and any site reforestation or revegetation.
G. 
Preliminary erosion and sediment control plan that at a minimum meets the requirements outlined in local erosion and sediment control guidelines.
H. 
Identification of preliminary waiver requests.
I. 
Maintenance plan.
All final applications shall be submitted to the Planning Board and shall include the following information:
A. 
Subsections A through I in § 92-3 above;
B. 
Approval from the Village Engineer; and
C. 
Approval from the Village Superintendent of Public Works.
The Planning Board shall review all preliminary applications. Upon submission of a final application, following a public hearing, the Planning Board shall approve or deny any final application by reviewing each and every requirement in §§ 92-2 and 92-3 above. Those aggrieved by the decision of the Planning Board may appeal to the Zoning Board of Appeals. Those aggrieved by a decision of the Zoning Board of Appeals may appeal such decision to the Supreme Court pursuant to Article 78 of the Civil Practice Law and Rules.
During the excavation and installation process, the Village, its agents or subcontractors may perform periodic inspections to ensure that the excavation and installation process matches the approved plan, upon sufficient notice to the landowner. Notice shall be deemed sufficient if seven days' notice is given in-person or verbally directly to the landowner, or 14 days' notice by writing to the landowner's address of record as listed on the latest assessment roll. These agents and/or subcontractors shall include, but not be limited to, the Village Engineer, the Village Superintendent of Public Works, the Village Code Enforcement Officer(s), the Mayor, and Trustees of the Village Board. When necessary, in the case of a flash flood or other stormwater emergency, the Village and its agents may enter the premises without fulfilling the notice requirements contained herein. The Village and its agents, however, shall make a good faith effort to notify the landowner prior to his/her/their entry onto the premises.
The Village Superintendent of Public Works, or any of his or her employees, may enter the premises to inspect the maintenance and operation of any detention or retention pond upon sufficient notice to the landowner. Notice shall be deemed sufficient if seven days' notice is given in-person or verbally directly to the landowner, or 14 days' notice by writing to the landowner's address of record as listed on the latest assessment roll. The Village reserves the right to impose future maintenance and operation requirements for detention and retention ponds. When necessary, in the case of a flash flood or other stormwater emergency, the Village and its agents may enter the premises without fulfilling the notice requirements contained herein. The Village and its agents, however, shall make a good faith effort to notify the landowner prior to his/her/their entry onto the premises.