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Flow rate lab questions

# Flow rate lab questions - per second is or 0.25CFS b It is...

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Adam Pescatore Water Flow Rate Measurement Summary of Notable Findings: Farmers install weirs and flumes for the purpose of measuring flow rate. This is relevant because it will tell the farmer how much time it takes to irrigate his or her field. In the field, flow rate is calculated by obtaining a velocity measurement and a head measurement. Usually a table exists for weirs or flumes that displays head values and their corresponding flow rates. The numbers come from a version of the general equations that are more specific to individual weirs or flumes. Several different weirs were measured in this lab and their head lengths were used to get a flow rate. Most of the equations for flow rate were spot on in the calculations, but the open pipe trajectory method proved to be incompatible with the pipe observed at in the field. As mentioned in question c below, the pope had valves and turns in it that affected the velocity calculated. Questions: a. The flow rate for water in a pipe with a 4-inch inside diameter with a velocity of 2.4 feet
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Unformatted text preview: per second is or 0.25CFS b. It is important to measure the flow rate at precise locations in both pipe and channel cross sections because with the flow rate on hand, a farmer or irrigator can calculate how much water will deliver to their crop in a given time. It is important to be precise because a small field error can lead to a large miscalculation in the long run, which will cost somebody their money. c. A potential source of error in the measuring of the pipe is the convoluted path that the water takes to get through the pipe; going through bends and valves. This alters the velocity of the water coming out, which ends up skewing the calculated flow rate away from the actual flow rate. Also, as the water comes out of the pipe, there are pockets of air in the stream coming out of the pipe. The actual diameter of the pipe is not accurate in this case....
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