In the selection of a drainage plan for a development, the applicant shall evaluate and implement, where practicable, site design features which minimize the increase in runoff volumes and rates from the site. The applicant's drainage plan submittal shall include evaluations of site design features which are consistent with the following hierarchy:
A. Minimize impervious surfaces on the property, consistent with the needs of the project;
B. Attenuate flows by use of open vegetated swales and natural depressions and preserve existing natural stream channels;
C. Infiltrate runoff on site;
D. Provide storm water retention structures;
E. Provide storm water detention structures; and
F. Construct storm sewers. (Ord. 1630, 4-12-1999)