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<br />, <br /> <br />(100076 <br /> <br />Exp flow ad hoc group mtg <br />May 29,2001 <br /> <br />Experiments discussed to date <br /> <br />1 - April BHBF following Biological Opinion SASF (8K steady during 8.23 mafyear) <br />+/- 60K <br /> <br />purpose - the main channel could accumulate sediment from trib inputs if dam releases were kept <br />below 10,000 cfs, and BHBFs could redeposit this sediment at higher elevations <br /> <br />2 - Ian or April BHBF following fall HMF during Paria inputs (or LCR > 10K peak?) <br />+/- 60K, non-8.23 mafyear <br /> <br />purpose - Fall HMFs would retain sediment from fall trib events for deposition, and succeeding <br />BHBFs would redeposit these inputs as effectively as #1 <br /> <br />3 - 90K BHBF depending on outcome of # 1 and #2 <br /> <br />purpose - more significant impacts than a BHBF at 60K, targeting the OHWZ? <br /> <br />4 - 45K BHBF to assess sediment tranport changes since 1996 <br /> <br />purpose - determine changes in concentration and grain size deposition since 1996 (comparison <br />with 1996 BHBF test). Could be a I-day test? <br /> <br />5 - fall Habitat Maintenance Flow (31K) during / following Paria inputs <br /> <br />purpose - store sediment inputs in eddies at elevations exceeding normal powerplant operations <br /> <br />6 - powerplant fluctuations (8K - 31K) during / following Paria inputs, alternating fluctuating and <br />steady flows (2 days each) <br /> <br />purpose - powerplant capacity fluctuations would be just as effective as HMFs in recharging eddy <br />deposits, by allowing low flows for channel accumulation, reducing overall downstream sediment <br />transport <br /> <br />7- fluctuations following BHBF <br /> <br />purpose - determine if load has an adverse effect on newly deposited bars <br /> <br />Additional comments/questions on experiments: <br />- do a series of high flow events cumulatively deplete the system? <br />- would there be circumstances where we would not want to perform an experiment? <br />