on the Lower Colorado, the weekly human hydrograph

I love this:

Thursday is the lowest release for the week, so starting late Thursday the water begins to drop in the river, with the lowest flows on Saturday. If you are a recreational water user — skiing, fishing, pleasure boating, or jet skiing — less water means more sandbars or exposed debris to avoid. You may ask why the releases are not kept at a uniform flow? Farmers are people, too, with families and other responsibilities. Irrigations are scheduled so that they can also enjoy other activities on weekends. By Monday morning, water releases are at their full flow for the week.

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