Our geologist is working on another project -this time, siting a retention/deten

Question

Our geologist is working on another project -this time, siting a retention/detention structure to store storm runoff temporarily, allowing most of it to percolate slowly into the ground instead of being quickly flushed down the streams or storm -sewers). Here's the sketched cross-section - it is a suburban area in western Oregon (a few miles or km across; SL = sea level). Five sites have been suggested. Based on what you've learned this quarter about rocks and soils, topography, flow of ground and surface waters, slope instability, etc. ???, which do you think would be the best choice? A) B) C) D) E)

Explanation / Answer

a)beach deposits

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