§ 143-14. Storm drainage., Article III. Design Standards, Chapter 143. Subdivision of Land, Part II. General Legislation, Code of Ordinances, Malta

General. In designing for storm drainage, The Town of Malta Standard Specifications for Storm Drainage Systems, as adopted, shall be adhered to.

Design criteria.

(1)

All components shall be designed for runoff from the entire contributing watershed, taking future development into account. In addition, the design shall be considered as part of a larger storm drainage system and shall provide drains to the limits of the subdivision.

(2)

The following criteria shall be used in designing for storm drainage:

(a)

Storm drainage systems shall be designed to accommodate a ten-year design storm.

(b)

Stormwater management systems, when required, shall be designed to accommodate a twenty-five-year design storm with provisions to safely pass a one-hundred-year-storm event.

(c)

Culverts to be installed to carry existing streams and waterways will be reviewed by the Town on an individual basis, and design criteria will be established at that time.

(d)

Surface flow on streets shall be limited to a maximum of 350 feet.

Pipe. Required pipe sizes shall be determined by a method approved by the Town Engineer, or other agent designated by the Malta Town Board, or other agent. All pipe shall be installed with a minimum cover of two feet, unless approved by the Town Engineer.

Catch basins and manholes.

(1)

Catch basins, manholes, frames, covers and grates shall conform to the Town Standard Specifications for Storm Drainage System, 2017, and as may be amended or modified in the future.

(2)

Storm inlets shall be located to intercept runoff before it enters an intersection and at all low points. Catch basins on storm mains shall be provided with sumps where required by the Board.

Trash racks. Trash racks may be required where the intake of branches or debris to the storm system may clog the line. The design of the trash rack shall be based on conditions and requirements of each particular case.

Grading.

(1)

Lots shall be graded so that runoff from roofs, drives and other impervious surfaces flows toward a street, except that such runoff may flow to the rear where a watercourse abuts the rear of a lot. If it is not practicable to direct runoff to the street, a grading plan for the area may be required by the Board. Such grading plan shall show that grading is designed to prevent ponding and to direct water away from all buildings.

(2)

Lots having driveways sloping away from streets shall have driveways paved so as to provide a high point at or near the right-of-way. It is intended that this high point will prevent street runoff from entering the lot.

(3)

Structures shall have ground floor elevations not less than 18 inches above the final road elevation to assure positive drainage away from the structure.

Erosion and sediment control. All erosion and sediment control measures shall be designed in accordance with the latest edition of the New York Guidelines for Urban Erosion and Sediment Control, by the Soil and Water Conservation Society, and in accordance with Town of Malta and NYSDEC MS4 requirements.