# 1-34 - BIE 5110/6110 Sprinkle Trickle Irrigation Fall...

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BIE 5110/6110 Sprinkle & Trickle Irrigation Fall Semester 2004 – Exam #2 Include units in all results. Indicate any assumptions that you might make. Don’t show more than three significant digits in the results. Name__________________________________ 1. (60 pts) Two gun sprinklers are supplied water from a pump at an open reservoir (water surface at 203 ft above msl), as shown in the figure below: reservoir (elev = 203 ft) pump (elev = 209 ft) gun #1 (elev = 219 ft) gun #2 (elev = 228 ft) 4 5 0 ft 3 6 2 f t “T” (elev = 217 ft) There is a common 4-inch (ID = 4.280”) PVC supply line from the pump to a “T”. The supply line is 450 ft long. A 3-inch (ID = 3.284”) PVC pipe goes 365 ft from the “T” to gun #1, and another 3-inch pipe goes 200 ft from the “T” to gun #2. The sprinkler height above the buried lateral pipe is h r = 8.00 ft for both guns. The flow rate vs. pressure data for the gun sprinkler give the following relationship: 0.49 q1 1 . 7 P = for q in gpm; and P in psi. The suction side of the pump has the same 4-inch PVC pipe as the supply line, 12 ft in length, with two 45-degree long-radius, flanged elbows, a basket strainer, and a foot valve. 1 of 7

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a) Develop one point on the system curve using the Hazen-Williams equation (with C = 150) for friction losses. Use a flow rate of 80 gpm for gun sprinkler #1. b) Calculate the flow rate for gun sprinkler #2. c) Calculate the total system flow rate, Q s . d) Calculate TDH for this flow rate. Show your calculations for minor losses.
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1-34 - BIE 5110/6110 Sprinkle Trickle Irrigation Fall...

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