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Lec14 - University of California Berkeley Civil Engineering...

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University of California, Berkeley Professor Ken Johnson Civil Engineering 70 Engineering Geology Civil Engineering 70 Lecture 14 10/11/07 Water Resources o Benefits/Concerns o Groundwater Basin o Boundaries o Water Quality o Management o Well Head / Source Water Protection Graded Stream Profile o Baseline Generally sea level o Rivers approach the baseline asymptotically coming from the mountains exponentially o Dams create a new baseline Sediments accumulate behind the dam and creates a new asymptotic baseline Downstream of the dam, there is more erosion as the river tries to reestablish the graded stream profile. The river tries to take back the sediments lost behind the dam Alluvial Fan o Where a river hits the base of the hill side Goes from steep to shallow Alluvium is deposited into the flat area o San Francisco Bay is surrounded by an alluvium apron All the flat parts are alluvial fans, sediments coming from the surrounding mountains Drainage Basin o A boundary where water falls and drains in one system o Drainage boundaries are determined by topography Mountains determine where water originates
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