A comprehensive plan showing that the stormwater drainage system is designed to convey the stormwater runoff and to detain the increased stormwater runoff in accordance with this chapter must be provided. The comprehensive plan shall include maps and other descriptive materials showing the drainage plan and the following, as applicable:
(A) The extent and area of each watershed affecting the design of detention and other drainage facilities as shown on USGS Quadrangle maps or other more detailed maps as required by the town.
(B) The preliminary layout and design of proposed storm sewers, the outfall and outlet locations and approximate elevations, the receiving stream or channel and its 100 year return period water surface elevation.
(C) The location and design of the proposed street system, especially including depressed pavements used to convey or temporarily store overflow from the heavier rainstorms, and the outlets for such overflow.
(D) The locations, cross sections and profiles of existing streams and floodplains to be maintained, and new channels to be constructed.
(E) The materials, elevations, waterway openings, and the basis for design of proposed culverts and bridges.
(F) Existing detention ponds and basins to be maintained, enlarged, or otherwise altered and new ponds or basins to be built and the basis of their design.
(G) The estimated depth and amount of storage required in the new ponds or basins.
(H) The estimated location and percentage of impervious surfaces existing and expected to be constructed when the development is completed.
(I) If the proposed development is part of a larger project that will be completed in the future, the calculations must include a master plan for the full site at ultimate development. The calculations must show how the fully developed site will drain and how the interim drainage system built with the smaller project will be incorporated into the final drainage plan for the full site.
(Ord. 1999-05, passed 6-8-99)