780Fc13121: "Downstream arrangement of the 4-foot modified Parshall measuring flume, short throat type"
Note on envelope reads, "Colorado sta." Title information from "Progress Report on Tests of Modified Parshall Measuring Flumes," in "28. Special Tests of Variations of Parshall Flume Bellvue Laboratory, summer and fall 1932," Irrigation Research Papers, Water Resources Archive, CSU Archives and Special Collections. See Figure 1. Caption further reads, "Hb piezometer located on axis of flume at midpoint of the slope."