05b9ba calculation of parshall flume submerged flow rate si units

Parshall Flume Calculations - S.I. units 2. Flow Rate for Submerged Flow (1' to 50' Throat Width Throat Submerg. Width Ratio, S W, m. 0.305 0.3048 0.2438 0.8 0.1133 0.00628 0.457 0.3048 0.2438 0.8 0.1699 0.0088 0.610 0.3048 0.2438 0.8 0.2266 0.01131 0.914 0.3048 0.2438 0.8 0.3398 0.01508 1.219 0.3048 0.2438 0.8 0.4531 0.01948 1.524 0.3048 0.2438 0.8 0.5663 0.02325 1.829 0.3048 0.2438 0.8 0.6791 0.02702 2.134 0.3048 0.2438 0.8 0.7930 0.03079 2.438 0.3048 0.2438 0.8 0.9062 0.03393 3.048 0.3048 0.2438 0.8 1.115 0.00654 3.658 0.3048 0.2438 0.8 1.324 0.00785 4.572 0.3048 0.2438 0.8 1.638 0.00981 6.096 0.3048 0.2438 0.8 2.159 0.01308 7.620 0.3048 0.2438 0.8 2.681 0.01635 9.144 0.3048 0.2438 0.8 3.204 0.01962 12.19 0.3048 0.2438 0.8 4.248 0.02616 15.24 0.3048 0.2438 0.8 5.291 0.03271 Enter measured Ha and Hb for correct Throat Width, W. The sprea submergence ratio, Hb/Ha; Q calculated for free flow, Qfree; corr submergence, Q corr ; and the flow rate for submerged flow, Q subm . Qfree Qcorr Ha*, m Hb*, m (Hb/Ha) m 3 /s m 3 /s * For the locations in the flume to measure Ha and Hb, see the f Open Channel Flow Measurement 2: The Parshall Flume

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Sheet1Parshall Flume Calculations - S.I. units2. Flow Rate for Submerged Flow (1' to 50' Throat Width)Equations for Calculation of Flow Rate under Submerged Conditions:Enter measured Ha and Hb for correct Throat Width, W. The spreadsheet will calculate1. For 0.3 m < W < 2.44 msubmergence ratio, Hb/Ha; Q calculated for free flow, Qfree; correction forsubmergence, Qcorr; and the flow rate for submerged flow, Qsubm.Qsubm = Qfree - QcorrThroatSubmerg.Qcorr = (3.738/106) M (Ha/0.3048)2.123 e9.284SWidthRatio, SQfreeQcorrQsubmW, m.Ha*, mHb*, m(Hb/Ha)m3/sm3/sm3/sW, mM0.3050.30480.243840.80.11330.00628363280.1070.30510.4570.30480.243840.80.16990.00879708590.1610.4571.40.6100.30480.243840.80.22660.0113105390.2150.611.80.9140.30480.243840.80.33980.01508071860.3250.9142.41.2190.30480.243840.80.45310.01947926160.4341.2193.11.5240.30480.243840.80.56630.02324944120.5431.5243.71.8290.30480.243840.80.67910.02701962090.6521.8294.32.1340.30480.243840.80.79300.03078980050.7622.1344.92.4380.30480.243840.80.90620.03393161690.8722.4385.43.0480.30480.243840.81.1150.00654129211.1093.6580.30480.243840.81.3240.0078504091.316For 0.03 m < W < 2.44 m , S < 0.7 is needed for free flow.4.5720.30480.243840.81.6380.00981193821.6286.0960.30480.243840.82.1590.01308258422.1462. For 3 m < W < 15 m7.6200.30480.243840.82.6810.01635323032.6649.1440.30480.243840.83.2040.01962387633.184Qsubm = Qfree + Qcorr12.190.30480.243840.84.2480.02616087624.22215.240.30480.243840.85.2910.03270646055.258Qcorr = (W/3.048)(0.30483) (3.364 + 20.19 S2 ln S )2* For the locations in the flume to measure Ha and Hb, see the following article:For 3 m < W < 15 m , S < 0.8 is needed for free flow.Open Channel Flow Measurement 2: The Parshall Flume

Open Channel Flow Measurement 2: The Parshall Flume

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