Calculated storm water runoff at a given point may be reduced by factors shown in
Table 5.5.2.2 based on the tributary area (in square miles) draining to said point.
Table 5.2.2.2
- Areal Reduction Factors
Areal Reduction Factors**
(for use in calculating Point Rainfall for Bexar County)
Area (sq mi)
Base ARF for Area
10
0.855
25
0.79
50
0.76
100
0.73
175
0.71
300
0.67
**Source: 2007 Watershed Hydrology Technical Support Data Notebooks on file with San
Antonio River Authority
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