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Stream channel cross sections for a reach of the Boise River in Ada County, Idaho

Open-File Report 99-211

Prepared in cooperation with Federal Emergency Management Agency, City of Boise, City of Garden City, City of Eagle, and Ada County
By:
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Abstract

The Federal Emergency Management Agency produces maps of areas that are likely to be inundated during major floods, usually the 100-year, or 1-percent probability, flood. The maps, called Flood Insurance Rate Maps, are used to determine flood insurance rates for homes, businesses, or other structures located in flood-prone areas. State and local governments also use these maps for help with, among other things, development planning and disaster mitigation. During the period October 1997 through December 1998, the initial phase of a hydraulic analysis project of the Boise River from Barber Dam to the Ada/Canyon County boundary, the U.S. Geological Survey collected stream channel cross-section data at 238 locations along the river and documented 108 elevation reference marks established for horizontal and vertical control. In the final phase of the project, the Survey will use these data to determine water-surface elevations for the 10-, 50-, 100-, and 500-year floods and to define floodway limits. The Federal Emergency Management Agency will use the results of this hydraulic analysis to update the 100- and 500-year flood boundaries and the floodway limits on their Flood Insurance Rate Maps.

Geospatial Extents

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Stream channel cross sections for a reach of the Boise River in Ada County, Idaho
Series title:
Open-File Report
Series number:
99-211
Year Published:
1999
Language:
English
Publisher:
U.S. Geological Survey
Publisher location:
Reston, VA
Contributing office(s):
Idaho Water Science Center
Description:
Report: iv, 100 p.; Data files
Number of Pages:
104
Country:
United States
State:
Idaho
County:
Ada
City:
Boise;Garden City;Eagle
Other Geospatial:
Barber Dam;Eagle Island