EBK WATER RESOURCES ENGINEERING
3rd Edition
ISBN: 9781119493167
Author: Mays
Publisher: VST
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Compute the specific energy (E) for a channel with a flow depth of 1.3 m, anaverage velocity of 0.8 m/s, and a bed slope of 0.014 m/m. The velocity is non uniformlydistributed across the cross section and the average velocity is taken from a 1/N powerlaw distribution where N = 6.
A 60-cm-diameter well is located in an aquifer with a transmissivity of 125 m2/day and a storativity of 5x10-2.
a) A fault (barrier) is located is located 300 m from the well. Determine the drawdown at the midpoint between the fault and the barrier at the end of one year’s pumpage at a rate of 2700 m3/day.
b) Replace the fault above with a fully penetrating stream; calculate the drawdown at the stream and midpoint between the well and the stream for the same pumping rate and duration of
A confined aquifer with transmissivity 7.0x10-3 m2/s and storativity 5.0x10-4 is pumped by two wells 35 m apart. One well is pumped at 7.6 liter/s and one at 15.2 liter/s. Plot the drawdown h0-h as a function of position along the line joining the two wells at a time 4 hours after the start of pumping.
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- The average flowrate at a small municipal wastewater treatment plant is 20,000 m'/d. The highest observed peak daily flowrate is 50,000 m'id. Design rectangular primary clarifiers with a channel width of 6 m. Use a minimum of two clarifiers, Use an overflow rate of 40 m/m d at average flow and a side water depth of 4 m.arrow_forward8. A hydraulic jump occurs in a rectangular channel and the depths of flow before and after the jump are 0.5 m and 3.0 m. Calculate (i) the critical depth and (ii) power lost per unit width of channel.arrow_forwardThere are two identical groundwater pump facilities that is operating 6 kilometers apart. The hydraulic conductivity is 40m/day. Each pump well structure has a tube diameter of 75cm. The original water table has an elevation of 110 m. However, it is maintained that the maximum drawdown (at the tube) is 18m. The water table will not change at the midpoint between the two pump wells. Determine the drawdown at a point 2 km from the pump.arrow_forward
- Through water diversion from a tributary of the Vaal River drainage system, a rectangular prismatic canal of dimensions 3 m depth and the width is 300% of the depth has been proposed. The canal is in concrete -finished and is intended to service a small community. The discharge in the canal is assumed to be 0.36 Megaliter/min. Calculate total energy, energy grade line, hydraulic grade line at the start of the diversion point if its elevation is 1400 marrow_forwardCalculate the discharge if Cd 0.63 4 m 4.5 m -2 m- 0.5 m- 1 m Fig. 8-7.arrow_forwardThe crest of a spillway dam is located 78 m above the platform of the dissipation tank located downstream. The slope height is 9.20 m and the maximum flow reaches 195 m3/s per crest meter. Dimension the type dissipating tank for these conditions.arrow_forward
- Please complete solution.arrow_forwardProblem 5 (10 points) For an unconfined aquifer with uniform rainfall recharge, the initial water table is 10 meters above the bottom confining layer. The rainfall recharge rate is 150 cm/year. The aquifer hydraulic conductivity is 20 m/day. An underground subway is planned to be 7 m above the confining layer. A pumping well is needed in order to lower the water table beneath the subway. If the pumping rate 500 m'/day is designed, what is the maximum distance to the subway that the pumping well can be in order to fulfill the dewatering purpose? Land surface tmt t t t t Original water table tertlog 1)eldor ol a un Subway tunnel 10m त ] abaond af d babaod K= 20 m/day tgnal ort (not to scale)nooih wbnootg bubsn n woft biltarrow_forwardPls answer it asaparrow_forward
- For the rectangular channel below, what is the flow depth right before the hydraulic jump (the smallest flow depth shown in the figure)? Flow depth upstream of the spillway is 9.6 m and discharge per width of the channel is 1.1 m2/s. Assume negligible energy loss over the spillway.Choose one: 0.08 m 9.6 m 6.24 m 0.02 marrow_forwardQ1 carrow_forwardConsider a rectangular channel 10 ftwide with the critical-flow meter shown in the figure having dimensions z= 1.10 ft. If the measured depth y1is 2.42 ft, what is the discharge? figure belowarrow_forward
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