A. Drainage easements or rights of way shall be adequate to accommodate the design frequency discharge within the limits of such dedication:
1. Where such dedication is not adjacent to and parallel with street right of way or other public property the city may require dedications in excess of that necessary to accommodate the design frequency discharge in order to facilitate maintenance access;
2. In no case shall a drainage easement or right of way for surface facilities provide a width of less than ten feet (10') unless adjacent to and parallel with a dedicated street or other public open space;
3. In no case shall a drainage easement or right of way for storm sewer facilities provide a width of less than fifteen feet (15') unless adjacent to and parallel with a dedicated street or other public open space;
4. Where a drainage easement overlaps or parallels a utility easement the city may require such additional width as necessary to permit installation of utilities without obstruction or interference with drainage system elements. In such instances, development plans shall indicate the location of utility facilities within the coincident easements;
5. Where portions of a development are within a floodplain, identified in the flood insurance study for the city, easements or rights of way shall be sufficient to assure compliance with the flood hazard area development regulations as contained within the land development code;
6. Drainage system elements with a contributing drainage basin area of one hundred twenty (120) acres or greater shall be within rights of way dedicated to the city;
7. Drainage system components with a contributing drainage basin area of greater than forty (40) and less than one hundred twenty (120) acres may be within dedicated drainage easements provided that such easement shall be in excess of any minimum lot size requirements established within applicable zoning or subdivision regulations;
8. Drainage system components with a contributing drainage basin of less than forty (40) acres may be within dedicated drainage easements; and
9. In no case shall a subdivision design require that surface drainage from any tract or lot to cross more than two (2) separate tracts or lots without being contained or diverted into a dedicated street, drainage right of way or drainage easement. (Ord. 1387, 1-30-1996)