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I I I I I I I I I I I I I I I I I I I Mono Lake Basin Hydrologic And Geomorphic Studies Mono Lake Tributaries and Upper Owens River California Department of Fish and Game Sacramento, California This project involved an investigation of the effects of stream diversions on the hydrologic and channel stability characteristics of Mono Lake tributaries and the Upper Owens River. Detailed hydrologic, geomorphic, and sediment transport studies were conducted to establish diversion- related impacts to fisheries habitat by comparing riverine conditions with and witliout historical diversions. Recommendations for instream flow requirements were developed to support reestablishment of fisheries and riparian habitat within affected reaches. Study tasks performed by Ayres Associates personnel included the development of daily flow longitudinal hydrologic models for each tributary, conducting flow frequency analyses for with- and without-diversion scenarios, and summarizing hydraulic and sediment transport characteristics for each geomorphic reach. Ayres' results were used to derive habitat relationships for impact assessment. Noteworthy Features of this Job · Rigorous scientific methodologies were utilized within a controversial and politically-charged setting. · "With" versus "Without" techniques were used to develop impact assessment matrix. · Fluvial geomorphic principles were coupled with quantitative physical-process modeling of perennial and intermittant riverine environments. Why is this Job Relevant? · Impacts attributable to the alteration of hydrologic regimes caused by flow diversions were quantified. · Study methods and results were presented at workshops, public meetings, and agency hearings. · Project innvolved a multidisciplinary study team and extensive inter-agency coordination.