A contracted rectangular weir is to be constructed in a stream of water in which the discharge varies from 55 to 1415 liter/sec. Determine the length of weir, such that the measured head will never be less than 60 mm or greater than one third of the length of the weir.

A rectangular weir having a length of one meter is constructed at one end of a tank having a square section 20 x 20m and a height 10m. If the initial head on the weir is Im, determine the time required to discharge a volume of 72 cu.m. a). 78 sec. Solution: b). 55 sec. c). 97 sec. d). 68 sec.

The discharge of water over a 45 degree triangular weir is 0.728 cfs. What is the head?

11.Show that doubling the head over a rectangular weir or trapezoidal weir makes the discharge 2.8 times greater.

HW1 // A stepped rectangular weir has the upper step 1m wide and 0.3m deep and the lower step 0.6m wide and 0.5m deep. Calculate the discharge when the water level just touches the top edge of the weir. cd= 0.6 HW2 // What is the equation for the compound weir below? HW3 // Water flows at a rate of 5 m3/sec in a rectangular channel of width 10m. the normal depth of flow in channel is 5m. if a sharp-crest weir of height 5m is installed across the channel, determine the new flow depth in the channel for the same flowrate? cd = 0.6 HW4 // A rectangular weir with 1.6 m width. How high should it be placed in a channel to maintain an upstream depth of 2.35 m for 0.4 m3/sec flow? 0.65 cd = (1+4)

5. What is the flow rate of water over a 60° triangular weir when the head is 0.90 ft?

Problem 6 - 75 What length of a Cipolletti weir should be constructed in order that the head of flow will be 0.96 m when the flow rate is 3.76 m³/s? Ans: 2.15 m

A rectangular weir of 4.5 m long is to be built across a rectangular channel if the maximum depth of water on the upstream side of weir is to be 1.75 m. What should be the crest height of the weir if: a) the discharge over weir is 5.5 m³/sec, b) the discharge over weir is 9 m³/sec? Where the discharge coefficient cd=+0.5. 50

Determine the discharge, in L/s, over the weir having a head of 0.30 m if a a contracted rectangular sharp crested weir 2 m long is used. Select the correct response: 51 611 587 69 O O

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