![]() ![]() The Submergence Transition (S t) for the 18-inch Parshall Flume is 70%. The point at which submergence is sufficient to require correction is termed the Submergence Transition (S t). When downstream conditions are such that they restrict the flow out of a flume, the flume is termed to be submerged and corrections to the indicated flow need to be made. Openchannelflow offers the 18-inch Parshall Flume in four different materials: Openchannelflows head vs flow table for the 36-inch Parshall Flume is available for download. Discharge equations in CFS, GPM, MGD, L/S, and M3/HR The general free-flow equation for Parshall Flumes is: 36-inch Parshall flume.A plan view showing the point of measurement (H a).The values for the 18-inch Parshall Flume are: Minimum Head (ft)Ī discharge table for the 18-inch Parshall is available for download. The general free-flow equation for the Parshall Flume is: ![]() Flume DimensionsĪlways remember that Parshall Flumes are not scale models of each other. Also, a correction for settling has also been developed. Should the flume become submerged due to downstream conditions, a universal flow equation is available to correct the flow rate. In the field, variances in approach conditions, minor errors in the installation, and typical construction tolerances mean that the user should more realistically expect an accuracy of +/-5% ( ASTM D1941). The laboratory accuracy of Parshall Flumes has been found to be +/-2%. Two-piece manhole construction is common when burial depths are greater than 8-feet.A 60-inch manhole barrel is required to integrate an 18-inch Parshall Flume.Metering manholes (factory integration of a flume into a fiberglass manhole).Stubs and flanges up to 36-inches can be accommodated.Our knowledgeable staff has over 30 years of industry experience and can point you in the right direction of which style flume to choose. ![]()
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