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F11_hw06 - 4 Determine the discharge through a An...

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ENV 4561 Fall 2011 Homework # 6 Assigned: October 6, 2011 Due October 13, 2011 1) A 4 ft rectangular channel carries a flow of 28 cfs and terminates in an overfall. The channel has a slope of 0.0018 ft/ft and n = 0.013. Determine the distance from the overfall to where the critical and the normal depths occur. End you calculations when your calculated depth is within 1.5% of the normal depth. 2) A concrete channel is 5 feet wide and 4 feet deep with a weir that extends across the entire width and is set to 2 ft above the channel bottom. If the water is flowing in the channel at an elevation of 145.2 ft and the channel bottom elevation is 142 ft, what is the flow over the weir? Compare the Francis, Rehbock and Basin equations . 3) Determine the difference in head on a 60 o V-notch weir and a 45 o V-notch weir in a channel if the flow is 10 cfs and c 1 = 2.7. Comment on the effect of the angle of the V-notch weir on head.
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Unformatted text preview: 4) Determine the discharge through: a) An unsubmerged 9-in. Parshall flume with Ha = 2.27 ft b) A 6-ft Parshall flume with Ha = 2.6 ft and Hb = 2 ft. If you need to use correction factors in your calculations that are not available in your book, go to the US Bureau of Reclamation, and you can find correction factors in their publication: “Water Measurement Manual.” ( http://www.usbr.gov/pmts/hydraulics_lab/pubs/wmm/ ) 5) Design a Parshall flume to handle 10 mgd flow in a 4 ft wide channel at a downstream depth of 3.3 ft. If the channel floor is at elevation 73.4 ft, what is the water elevation upstream of the flume? What is the flume crest elevation? Include a design drawing and state all assumptions. (You can use page 129 in BJP for an example of the design drawing)....
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