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<br />96 <br /> <br />2418 parameteTs to provide predictive assessment of traditional resources, This information would <br />2419 help to determine inundation frequency as well as critical threshold levels for triggering <br />2420 recommendations for remedial responses. The ongoing mainstem flow and deposition <br />2421 project is testing this model in one area of the river corridor where archaeological resources <br />2422 have been identified, If the modeling work proves useful in this test area, the model can be <br />2423 applied to other areas and other types of important resources. <br />2424 3) Test and apply a model of geomorphic processes relative to archaeological site <br />2425 erosion. The existing work linking certain geomorphic process and archaeological site <br />2426 erosion (Hereford et aI., 1991) is currently being evaluated. This work hypothesizes that <br />2427 sediment loss related to regulated flows and the absence of natural flooding events, foster <br />2428 arroyo cutting through terraces due to mainstem bank failure and cutbank retreat combined <br />2429 with natural run off processes. Together these processes remove terrace sediments that <br />2430 contain archaeological deposits. Past site assessments from P A program field work, suggest <br />2431 that additional archaeological site monitoring is needed to test the above hypothesis. <br />2432 Evaluation of this erosional hypothesis is currently ongoing and will be applied in a limited <br />2433 area of the river corridor. It is anticipated that refinements to the model, further field testing, <br />2434 and possible application to other areas will occur during this planning period. Previous work <br />2435 (Yeatts 1996) with side channel arroyos during the 1996 experimental flow, indicates that <br />2436 flows of higher magnitude can redeposit sediments and potentially slow erosion. Together <br />2437 this information should provide additional data to determine the longer term effects of <br />2438 varying planned flow events on resources. <br />2439 <br />2440 M02) If in situ conservation is not possible, desil!Il mitigative strategies that integrate the full <br />2441 consideration of the values of all concerned tribes with a scientific approach. <br />2442 IN 2.1 Characterize through scientific study and data development all assumed <br />2443 historical and current values, including scientific values, of resources to tribal nations and to <br />2444 the general public [priority 3] <br />2445 IN 2.2 Develop research designs and costs associated with data recovery. [priority 9] <br /> <br />November S, 1998 <br />Second Draft - Do Not Cite, Photocopy, or DlstrIbute <br />