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实验过程：1.设置a. b. 用大约位于水槽纵向中间的点测器测量水槽底部的深度。c. 关闭排水阀；启动大泵；并打开进水阀。d. 强烈建议在测量深度时打开电子表格，以验证流量是亚临界还是超临界。
Task:
Experimental Procedure:
1. Set-up
a. Open both sluice gates as high as they will go.
b. Measure the depth of the bottom of the flume with the point gage located approximately in the middle of the flume lengthwise. This value will be the datum against which other measurements are compared.
c. Close the drain valve; start the large pump; and open the inlet valve.
d. It is highly recommended to have a spreadsheet opened during the depth measurement to verify whether flow is subcritical or supercritical. How???
2. Measure a range of subcritical depths at a single flow.
a. Establish a steady flow in the flume of about 100 or 200 gpm. (The exact value doesn’t matter but record it.)
b. Drop the downstream sluice gate until it barely impinges on the flow. Use a tape measure to measure the height of the gate above the wall of the flume.
c. As the gate impinges on the flow, the water will back up in the flume on the upstream side of the gate. The flow out of the gate opening will be supercritical but the upstream flow will be subcritical. Slowly lower the gate until the flume is nearly full. Wait for the flow to come to steady state between movements of the gate. If you lower the gate too far, the water will overtop the flume and your feet will get wet!
d. Measure and record the height of the water surface with the point gage in the middle of the flume lengthwise. Use a tape measure to measure the height of the gate above the wall of the flume.
e. Raise the gate a short distance; wait for the flow to come to steady state; and measure the water surface again. Repeat this step until you have at least 4 measurements of depth
Write-up
No professional memo is needed for this lab. But answer the following questions in a tab of your spreadsheet.
1. How is Froude Number related to the flow regime in terms of subcritical and supercritical?
2. How is critical depth determined on the Energy Graph?
3. For specific amount of energy, how many flow depth(s) could be determined from the Energy Graph? What are those depth(s) called?
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