Inland waters records (GRS-2598)

Description

These geospatial records contain information on inland water features such as lakes, streams, ponds, watersheds, dam names, and the Great Salt Lake shoreline; National Hydrology Data (NHD); and drainage systems. These include hydrology records and the Digital Flood Insurance Rate Map (DFIRMS). The DFIRM database depicts flood risk information and supporting data used to develop risk assessment. The primary risk classifications used are the 1-percent-annual-chance flood event, the 0.2-percent-annual-chance flood event, and areas of minimal flood risk. The DFIRM Database is derived from Flood Insurance Studies (FISs), previously published Flood Insurance Rate Maps (FIRMs), flood hazard analyses performed in support of the FISs and FIRMs, and new mapping data, where available. The FISs and FIRMs are published by the Federal Emergency Management Agency (FEMA). The file is georeferenced to earth's surface using the Universal Transverse Mercator (UTM) projection and coordinate system. The sp ecifications for the horizontal control of DFIRM data files are consistent with those required for mapping at a scale of 1:12,000.

Retention and Disposition

Retain permanently. Transfer records to the archives.

Appraisal Value

Appraisal