The San Antonio Flood of 1998

Tunnel Inlet

Last Index Next

The downtown region was lucky in that engineers had completed a drainage tunnel under the heart of the city the previous December. This is the dam that diverts the river into the tunnel, which can handle 7,000 gallons per minute.
The flood waters were almost even too great for this new flood control project. This is the area upstream. U.S. Highway 281 runs across the bridge that is just a few inches above the water.
To keep the debris from being sucked in, the structure has grates with this massive mechanism to comb trash out periodically.
This is the flow of the river that did not get channeled off. The scale indicates that 648 cubic feet of water is passing through every minute.
Last Index Next

Last updated November 26, 1998