Sandstone= | 49% to 89% less with peak runoff | 26% to 83% build up―good on sandstone |
20% to 49% less with moderate runoff | ||
Basalt= | 16% to 53% less with moderate runoff | 20% - 42.5% build up―good on basalt |
56% to 90% less with peak runoff | ||
Alluvial soil= | 50% to 60% less with peak runoff | 3.4% to 26% build up―good on alluvial. |
10% - 20% less with moderate runoff |