(A) The subdivider shall construct storm water drainage facilities, which may include curbs and gutters, catch basins and inlets, storm sewers, road ditches and open channels as may be required. For storm water drainage facilities the design of the facilities shall be designed to accommodate the surface runoff incident to the ten-year design storm by utilization of the “rational method” or the “scs method” or both. All such facilities are to be of adequate size and grade to hydraulically accommodate maximum potential volumes of flow; the type of facility required, the design criteria and the size and grades to be determined by the Subdivision and Land Use Committee.
(1) Cross road culverts must have a minimum diameter of 15 inches or equivalent. Private entrance culverts must be adequate and have a minimum diameter of 12 inches and be at least 30 feet long.
(2) The agency that will have the maintenance of the street system must be consulted as to the acceptance of the storm water drainage facilities system.
(3) Storm drainage facilities shall be so designed as to prevent no hazard to life or property; and the size, type and installation of all storm water drains and sewers proposed to be constructed shall be in accordance with the plans and standard specifications approved by a registered engineer and those provided herein.
(B) No plat shall be approved for any subdivision or part thereof which is subject to periodic flooding or which contains inadequate drainage facilities or which makes adequate drainage of streets impossible. However, if the subdivider agrees in writing to make improvements at his or her expense which will, in the opinion of the County Engineer, make the area safe for human occupancy and use, and further provides adequate drainage for streets, then the preliminary and final plat may be approved.
(C) No existing ditch, stream, drain, slough, retention basin or drainage canal shall be deepened, widened, filled, rerouted or filled without permission from the County Engineer.
(D) The drainage system shall be constructed and be operational during construction; or as approved by the County Engineer.
(E) The natural drainage system shall be used as far as is feasible for the storage and flow of runoff.
(Ord. passed 10-14-2003; Ord. passed 11-10-2003; Ord. passed 11-14-2004; Ord. passed 9-11-2007)