Storm water detention provisions shall be as follows.
(A) Except as herein provided, all new or expanded developments shall provide for storm water detention to ensure that such expansion or construction minimizes storm water runoff onto adjacent properties through the steps outlined in division (C) below.
(B) New or expanded residential single-family residential development shall not be subject to the requirements of division (C) below. Nonetheless, the owner of any such single-family residential property shall be responsible for minimizing storm water runoff onto any adjacent properties as a result of such expansion or construction.
(C) (1) The locations of natural drainage systems, design of flood control and/or storm water management installations and devices shall be shown on a site plan that bears the seal of a certified engineer. The structures, devices, and methods used shall be planned, designed, constructed, and maintained so as to:
(a) Provide for the natural infiltration of storm water;
(b) Control the velocity of runoff flows;
(c) Extend the time of concentration of storm water runoff;
(d) Collect and transmit excess storm water flows into either the town drainage system or into a natural drainage system.
(2) No zoning permit will be issued for a new or expanded structure, other than single-family residential, unless the property owner first submits such site plan.
(D) The requirements of division (C) above may be waived by the town on a case-by-case basis where it is determined that the proposed expansion or construction is of such a nature that it will have no impacts on storm water runoff.
(E) The following criteria shall also be considered:
(1) A ten-year frequency storm shall be used in determining the amount of storm water run off generated.
(2) The impoundment of storm water runoff may be incorporated in the design of open spaces, parking lots, loading areas, playgrounds, and building structures provided the health, safety, and welfare of the public is not harmed in any way.
(3) To the extent practicable, all development shall conform to the natural contours of the land and natural and pre-existing man-made drainage ways shall remain undisturbed.
(4) No surface water may be channeled or directed into the sanitary sewer.
(a) All development shall be constructed and maintained so that adjacent properties are not unreasonably burdened with surface waters as a result of such development.
(b) More specifically:
1. No development may be constructed or maintained so that such development unreasonably impedes the natural flow of water from higher adjacent properties across such development, thereby unreasonably causing considerable damage to such higher adjacent properties;
2. Concrete curb or curb and gutter is required to adequately direct and control storm water in all parking lots.
(Ord. passed 11-3-1970; Am. Ord. passed 7-3- 1972; Am. Ord. passed 10-9-2001)