Flood hydrology for Dry Creek, Lake County, Northwestern Montana
By: C. Parrett and R.D. Jarrett
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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.
| 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 |
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