RETENTION BASIN HYDROGRAPH VOLUME COEFFICIENTS 25- YEAR CURVE

Volume (AF) = 1.25 x Coefficient x Area (AC) (in J - Zone)

Volume (AF) = 1.1 x Coefficient x Area (AC) (in I - Zone)

Volume (AF) = 1.35 x Coefficient x Area (AC) (in K - Zone)

imp* Soil 0% 5% 10% 15% 20% 30% 40% 50% 90% 100%

120 0.014 0.0287 0.0435 0.0582 0.0729 0.1024 0.1319 0.1614 0.2792 0.3087

123 0.0891 0.1001 0.111 0.122 0.133 0.155 0.1769 0.1989 0.2867 0.3087

124 0.0032 0.0185 0.0337 0.049 0.0643 0.0948 0.1254 0.1559 0.2781 0.3087

134 0.0055 0.0206 0.0358 0.051 0.0661 0.0964 0.1268 0.1571 0.2784 0.3087

FIGURE V-9