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00154Q " .. E. From bed load and suspended load data, develop bed-material supply relationships. From geologic investigations, evaluate the potential effect of landsl ides or other unusual sediment-loading conditions on the supply of bed material to the study reach. F. Using the transport capacity and supply relationships, back- calculate the hydrograph required on a mean annual basis to transport the sediment supply. (This will represent the minimum streamflow required for maintenance of the channel from a sediment deposition point of view.) *G. From quant itat i ve ground-cover data, eval uate streambank vegeta- tion, avail abil ity of adequate substrate for vegetat i on encroach- ment, and the type of vegetation that could be sustained in the available substrate. 1. Compare vegetation data with representative basel ine values developed from studies at diversion sites. 2. If adequate substrate is not available and streamside vegetation shows 1 ittl e potent i a 1 for i nvas i on, accept the results of item F above as the required maintenance flow. 3. If it is determined that there is potential for encroachment of vegetation, correlate the site to the most similar diversion site and analyze the velocity and duration of flows required to prevent substrate accumulation and/or remove existing material. * This task will be refined or expanded based on the results of the field investigation and analysis to be performed during the 1988 field season. REFERENCES l. Rosgen, David L., 1985. "A Stream Classification System." Paper presented at North American Riparian Conference, Tucson, Arizona. 2. Simons D. B. and Fuat Senturk, 1976. Sediment TransDort TechnoloGV. published by Water Resources Publication, Fort Collins, Colorado. 3. Wolman, Gordan M., 1954. "A Method of Sarnpl ing Coarse River-Bed Material." Transactions, American Geophysical Union, Volume 35, No.6.