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Appendix D - SOP for Stream Flow Measurement - Hansen Project 9 <br />Table 2. Lookup Table for Portable Cutthroat Flume (Continued) <br />Upstream <br />Gauge Height ft <br />g ) <br />Flow Rate in Gallons per Minute GPM based on Flume Bottom Width <br />gpm gpm gpm gpm cfs cfs cfs <br />cfs <br />b <br />11,t <br />Vt <br />411 <br />8" <br />/ 1f, <br />211 <br />4" <br />8" <br />0.65 <br />95.1 <br />194 <br />394 <br />803 <br />0.212 <br />0.431 <br />0.877 <br />10.79 <br />0.66 <br />98.0 <br />200 <br />406 <br />828 <br />0.218 <br />0.444 <br />0.905 <br />1.84 <br />0.67 <br />101 <br />206 <br />418 <br />853 <br />0.225 <br />0.458 <br />0.932 <br />1.90 <br />0.68 <br />104 <br />212 <br />431 <br />879 <br />0.232 <br />0.472 <br />0.960 <br />1.96 <br />0.69 <br />107 <br />218 <br />444 <br />905 <br />0.239 <br />0.486 <br />0.989 <br />2.02 <br />0.70 <br />110 <br />224 <br />457 <br />931 <br />0.246 <br />0.500 <br />1.02 <br />2.07 <br />0.71 <br />113 <br />231 <br />470 <br />958 <br />0.253 <br />0.514 <br />1.05 <br />2.13 <br />0.72 <br />117 <br />237 <br />483 <br />985 <br />0.260 <br />0.529 <br />1.08 <br />2.19 <br />0.73 <br />120 <br />244 <br />497 <br />1013 <br />0.267 <br />0.544 <br />1.11 <br />2.26 <br />0.74 <br />123 <br />251 <br />510 <br />1040 <br />0.275 <br />0.559 <br />1.14 <br />2.32 <br />0.75 <br />127 <br />258 <br />524 <br />1067 <br />0.282 <br />0.574 <br />1.17 <br />2.38 <br />NOTES: <br />Lookup table for collapsible cutthroat flume manufactured by BASKI, Inc. <br />For free discharge, downstream height _ by upstream height must be less than 0.5. <br />Throat Width Flow Rate <br />CFS GPM <br />1 Inch 0.50 hat 2 <br />225 hat <br />2 Inch 1.02 hat 4 <br />458 hat <br />4 Inch 2.08 haZ 9 <br />932 hat <br />8 Inch 4.22 hat 1 <br />1900 ha <br />ha= Upstream Gauge Height in Feet <br />For free discharge, the downstream height divided by the upstream height must be less than <br />Water Plow <br />Slope no greater <br />than 1% for 4 -6 feet <br />downstream height divided by upstream height <br />must be 0.5 or less for free Flow <br />Throat <br />Width Front <br />Width <br />(dimensions for 4 Inch flume) <br />1 -1 .12 to 2 times <br />Front Width <br />Water flow <br />Figure 2. Flow Rate Equation for 18 -Inch Baski Portable Cutthroat Flume <br />4153A.140129 Whetstone Associates <br />