Engineering Field Handbook, Part Two - Storm Distribution Regions
Quad Index Map - New York
This map shows the new four Storm Distribution Regions that should be used with the new county rainfall tables for the new Engineers Field Handbook, Part 2 (EFH-2) method. When watersheds are close to the boundary of the regions, the appropriate quad map can be examined to determine the appropriate storm region to use. Conservative design would use the higher region (A over B for instance) when the region cannot be determined with confidence. Specific design can be done with Win TR-20 where a more precise prediction is desired. The Win TR-20 software and training materials can be downloaded from NRCS's Hydrology and Hydraulics Web page.