11E-518 Drainage Improvements

For all subdivisions the subdivider shall submit with the preliminary plat application, such maps, profiles, and other data prepared by an engineer to indicate the proper drainage of the surface water to natural drainage courses or storm drains, existing or proposed. The location and width of the natural drainage courses shall be shown as an easement common to all owners within the subdivision and the Town on the preliminary and final plat. All natural drainage courses shall be left undisturbed or be improved in a manner that will increase the operating efficiency of the channel without overloading its capacity. An adequate storm and surface drainage system shall be a required improvement in all major subdivisions and shall be installed by the subdivider. Culverts shall be required where all water or drainage courses intersect with streets, driveways, or improved public easements and shall extend across and under the entire improved width thereof including shoulders. A. Culverts to be a minimum of 18” in diameter with a crush resistance as defined by AASHTO T99 Standards. B. Natural drainage channels should be used when available. C. Catchment basins to be designed to contain runoff during a one (1) 25 year storm event. D. All runoff to be contained on site. E. Measures should be taken to prevent storm water from entering irrigation canals. F. Easements shall be provided along drainages adequate to contain that watercourse and any further width necessary for maintenance of reconstruction.