780Ca13: "Weir basin at the Bellvue hydraulic laboratory, with a 4-foot rectangular weir mounted on the 15-foot crest."
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Cache la Poudre River visible in background. Title information from "The Parshall Measuring Flume" by Ralph L. Parshall. See Figure 30, which also reads, "Weir heads determined by two hookgages as shown. Discharge over the 4-foot weir, 7.67 second-feet."