withdrawals in other months of the year is due to outdoor water use, which is
completely or largely consumptive. The consumptive use coefficient from the
winter base rate method is given by Eq. (3):
CU coefficient %
ð Þ ¼ monthly withdrawal À winter withdrawal
ð
Þ =
monthly withdrawal
ð
Þ Âoutdoor use CU coefficient
ð
Þ
ð 3Þ
Fig. 3 Total monthly withdrawals and wastewater discharges are plotted for two small- to
medium-sized communities in the upper Potomac Basin. Also plotted are dry weather discharges,
estimated as the coefficients, b 1 , b 2 , b 3 , and b 4 , of the regression model,
discharge ¼ b 1 Â x 1 + b 2 Â x 2 + b 3 Â x 3 + b 4 Â x 4 + b 5 Â precipitation. The x i are binary variables
which ¼1 if month is in Season i, or ¼0 otherwise
Interactive Geospatial Analysis Tool for Estimating Watershed-Scale. . .
153
completely or largely consumptive. The consumptive use coefficient from the
winter base rate method is given by Eq. (3):
CU coefficient %
ð Þ ¼ monthly withdrawal À winter withdrawal
ð
Þ =
monthly withdrawal
ð
Þ Âoutdoor use CU coefficient
ð
Þ
ð 3Þ
Fig. 3 Total monthly withdrawals and wastewater discharges are plotted for two small- to
medium-sized communities in the upper Potomac Basin. Also plotted are dry weather discharges,
estimated as the coefficients, b 1 , b 2 , b 3 , and b 4 , of the regression model,
discharge ¼ b 1 Â x 1 + b 2 Â x 2 + b 3 Â x 3 + b 4 Â x 4 + b 5 Â precipitation. The x i are binary variables
which ¼1 if month is in Season i, or ¼0 otherwise
Interactive Geospatial Analysis Tool for Estimating Watershed-Scale. . .
153