Estimated impact of stormwater reuse for irrigation on average annual runoff reduction

Estimated impact of stormwater reuse for irrigation on average annual runoff reduction. The table shows average annual runoff volumes (acre-feet) for 10-acre watersheds as a function of soil group and percent imperviousness. The range of average annual volume reduction from reuse is shown in the last two columns.
Hydrologic Soil Group (HSG)	Watershed Area (acre)	Watershed Imperviousness (%)	Average Annual Runoff Volume¹ (acre-ft)	Range of Average Annual Runoff Volume Reduction² (%)
A	10	10	2.3	6.0	98.3
	10	30	6.2	2.2	93.6
	10	50	10.2	1.4	86.2
	10	70	14.1	1.0	80.6
	10	90	18.1	0.8	76.7
B	10	10	3.2	4.3	91.7
	10	30	6.9	2.0	88.2
	10	50	10.7	1.3	83.3
	10	70	14.4	1.0	79.3
	10	90	18.2	0.8	76.4
C	10	10	3.9	3.5	87.6
	10	30	7.5	1.9	85.4
	10	50	11.1	1.3	81.8
	10	70	14.7	1.0	78.6
	10	90	18.3	0.8	76.2
D	10	10	4.7	2.9	84.6
	10	30	8.1	1.7	83.2
	10	50	11.5	1.2	80.5
	10	70	14.9	0.9	78.1
	10	90	18.4	0.8	76.0
^{1 - Based on 50-year P8 model run from January 1, 1955, through December 31, 2004, utilizing MSP climate data} ^{2 - Assumes stormwater storage volume for reuse equivalent to the one-week demand for irrigation water assuming an application rate of 1"/week over the application area & irrigation period from May through September}