780Fc15607: "Showing center stake in bottom of channel, upstream from excavation, with top at elevation of the crest of the flume"
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Title information from "Improving the Distribution of Water to Farmers by Use of the Parshall Measuring Flume" by Ralph L. Parshall. See Figure 7. Caption further reads, "Note the raised central portion of the excavation which serves as the base for casting the floors of the flume structure."