Accession Number : ADA582972
Title : Ririe Dam Release Test Assessment
Descriptive Note : Final rept.
Corporate Author : ENGINEER RESEARCH AND DEVELOPMENT CENTER HANOVER NH COLD REGIONS RESEARCH AND ENGINEERING LAB
Personal Author(s) : Daly, Steven F ; Carr, Meredith ; Hall, Stephen ; Giovando, Jeremy
Report Date : Jun 2013
Pagination or Media Count : 73
Abstract : To potentially increase storage over the winter season, the US Army Corps of Engineers (Corps) Walla Walla District (NWW) is currently evaluating flood control operations at Ririe Reservoir. Because there is little experience with winter releases and a previous winter release resulted in minor flooding, it is important to understand the potential problems associated with releases in these conditions. Therefore, the Corps conducted a Release Test on 10-13 February 2013. Throughout the test, instruments took detailed measurements of the water temperature, stage, and discharge along the Willow Creek channel; and personnel observed the dynamic ice conditions. The test included an initial release of 150 cfs for 28 hr; a rapid increase to 300 cfs, which was held for 14.5 hr; and another rapid increase to 500 cfs, which was held for 24 hr. The flow was then shut off. Neither the Initial Release Wave nor subsequent flow significantly removed, dislodged, or eroded snow in the channel; the snow melted only after a thermal melt-out front advanced downstream. No out-of-bank flooding occurred. As a result of the information gathered from this Release Test and from one in 2011, this report presents a series of recommendations for future wintertime releases.
Descriptors : *DAMS , FLOODING , ICE , MELTING , RESERVOIRS , SNOW
Subject Categories : Civil Engineering
Distribution Statement : APPROVED FOR PUBLIC RELEASE