Restoration Plan for the Clark Fork River And the Blackfoot River Near Milltown Dam [electronic Resource] 2005 Appendix C
Restoration Plan for the Clark Fork River And the Blackfoot River Near Milltown Dam [electronic Resource] 2005 Appendix C
Montana.Natural Resource Damage Program
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Shear stress assessments typically compare critical shear stress to average total shear stress. Average shear stress is calculated by the equation, where x is the shear stress, y is the specific weight of water, R is the hydraulic radius, and s is the slope of the channel. Concerning channel design methods, the engineered channel is typically designed to generate a critical shear stress capable of initiating motion in a Dg^ size particle during a bankfull discharge event. This concept is consis...tent with several studies (Pickup 1976; Jackson and Beschta 1992; Grant 1987; Carling 1988; Sidle 1998; Booth 1990; and Leopold 1992). Significantly increasing or decreasing stream energy by modifying channel dimensions may lead to channel degradation or aggradation, respectively. C.5.1 Methods A critical shear stress analysis was completed for selected reference reaches. Hydraulic models were developed using HEC-RAS (US Army Corps of Engineers 2004) to estimate average total shear stress. As indicated previously, the model was calibrated by using field-surveyed channel geometry, bankfull indicators and bankfull discharges to predict Manning's roughness values.
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