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Science and Water, Then and Now — 2 Comments

  1. Last fall with fellow members of my engineering professional society I had the privilege of visiting Mission San Jose, cruising the river in downtown San Antonio, and touring the facilities at the upstream end of the flood control tunnel. We did see the top of the 150-foot vertical inlet tunnel but not the bottom (probably just as well ). They do occasionally inspect the underground tunnel but I think it’s by remote video. There are mechanical lifts on the grates at the inlet to keep floating debris out of the system. It was impressive even to us as engineers!

    A few technical details:
    The Olmos Dam, a few miles upriver, is part of the system controlling the water levels downtown.
    The river splits in two for part of its run through downtown, and there are several flood gates to manage the local water levels. Even under normal conditions they pump some water upriver through the tunnel to keep the water fresh.

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