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Flood hydrology for Dry Creek, Lake County, Northwestern Montana

By:
and
DOI: 10.1061/40517(2000)52

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Abstract

Dry Creek drains about 22.6 square kilometers of rugged mountainous terrain upstream from Tabor Dam in the Mission Range near St. Ignatius, Montana. Because of uncertainty about plausible peak discharges and concerns regarding the ability of the Tabor Dam spillway to safely convey these discharges, the flood hydrology for Dry Creek was evaluated on the basis of three hydrologic and geologic methods. The first method involved determining an envelope line relating flood discharge to drainage area on the basis of regional historical data and calculating a 500-year flood for Dry Creek using a regression equation. The second method involved paleoflood methods to estimate the maximum plausible discharge for 35 sites in the study area. The third method involved rainfall-runoff modeling for the Dry Creek basin in conjunction with regional precipitation information to determine plausible peak discharges. All of these methods resulted in estimates of plausible peak discharges that are substantially less than those predicted by the more generally applied probable maximum flood technique. Copyright ASCE 2004.

Additional Publication Details

Publication type:
Conference Paper
Publication Subtype:
Conference Paper
Title:
Flood hydrology for Dry Creek, Lake County, Northwestern Montana
ISBN:
0784405174; 9780784405178
DOI:
10.1061/40517(2000)52
Volume
104
Year Published:
2004
Language:
English
Larger Work Title:
Joint Conference on Water Resource Engineering and Water Resources Planning and Management 2000: Building Partnerships
Conference Title:
Joint Conference on Water Resource Engineering and Water Resources Planning and Management 2000
Conference Location:
Minneapolis, MN
Conference Date:
30 July 2000 through 2 August 2000