EBK WATER RESOURCES ENGINEERING
3rd Edition
ISBN: 9781119493167
Author: Mays
Publisher: VST
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Q21(
Water is pumped at a rate of 150 m³/hr to the upper reservoir as shown in
Fie 2. Calculate the power required to drive the pump. Take pump efficiency as 80%.
I need the answer as soon as possible
2. Water is pumped from a lower reservoir using a 75 kW pump. If the height of water at the higher reservoir is 120m.
And the flow rate of the pump is 0.03 m^3/s, what are the head losses of the system?
0.03 m's
120m
75kW
Pump
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- 6. A pump is connected to a rising main with a diameter of 0.35m and length of 400m. The rising main discharges to a level 32m above the sump level. The friction factor of the rising main may be taken as 0.01, local losses total 2.5V² /2g, and the pump has the characteristics shown in Table Q6. Determine the flow rate, head and efficiency at duty point under the following design scenarios: () One pump (i) Two pumps operating in parallel (ii) Two pumps operating in series You may find the following expression useful: ALV? h, 2gD Table 6: Pump A characteristics Flow rate (m3/s) 0 0.1 0.2 0.3 0.4 0.5 Pump head (m) 39 38 35 30 22 12 Efficiency (%) 48 62 63 55 44arrow_forwardExercise 4-3 (Problem ?? pp. ??) A single ideal pumping well, with radius of 1.0 ft and flow rate of 155 gpm, exists in an ideal confined aquifer. The aquifer has a saturated thickness of 82 ft. The pump continues running until equilibrium conditions are reached. The drawdown at the pumping well is 42 ft, and the drawdown at an observation well 138 ft away is 7.5 ft. Determine: ft² 1. Find the transmissivity in and hydraulic conductivity in 2. Find the radius of influence in feet.arrow_forwardA pipe line is 6 km long and having 20 cm diameter connects two reservoir 'A' and 'B'. The rate of discharge in the pipe is 30 lit/sec. Find out the difference in reservoir levels if friction factor f = 0.0008.arrow_forward
- . A 20 mm diameter well fully penetrates a confined aquifer of 30 m depth. For a pumpage of 35 litres/second the steady drawdowns at 100 m and 300 m distances from the well are observed as 3.2 m and 2.5 m respectively. Estimate the coefficient of permeability in m/day and transmissibility of the aquifer in m2 per day. Estimate also the drawdown at the well.arrow_forwardTwo identical groundwater pumps are operating 4.2 km apart. Each pump well structure has a tube diameter of 90cm. The original water table has an elevation of 60m and the hydraulic conductivity is 32m/day. However, it is maintained that the maximum drawdown (at the tube) is 14 m. The water table will not change at the midpoint between the two pump wells. If the water source is from a confined aquifer with thickness of 5m: A. Determine the drawdown at a point 0.5 km from the pump. B. Determine the discharge of each groundwater pump in m^3/s.arrow_forwardThe area of the reservoir is 1.5 km2 with an open evaporation of 85 cm/year. Assume that the average evapotranspiration from the catchment is 70 cm/year,estimate the average annual discharge from the outlet of the reservoir in m3/second? (Kindly explain all your working step by step)arrow_forward
- a. What is the critical depth in a rectangular channel with 2.3 m width and 0.91 m2/s discharge per width of the channel (steady flow)? Answer choices 0 m 0.27 m 0.43 m 0.11 m b. Calculate the minimum specific energy (in meters) from the previous problem. Explain the general approach through which you calculated the value of minimum specific energy.arrow_forwardPlease answer question 9.16 ASAParrow_forwardDetermine the flow in each pipe in the 3 reservoirs shown.arrow_forward
- 1. Water is being pumped from reservoir A to reservoir B. Taking h-0.006m/m, find the pump horsepower required assuming 85% pump efficiency and neglecting the minor losses. 50m 20m Pump Q = 2.5m/s D = 0.5m L = 1500m Aarrow_forwardRead the question carefully and give me right solution according to the questionarrow_forwardQuestion 4 Calculate the discharge (m³/day) through an infiltration gallery placed at a depth of 4m below ground water table, subjected to the condition that the drawdown in the well does not exceed 2.18 m. Take the length of the gallery 56.75 m and radius of influence to be 100m. The hydraulic conductivity can be assumed as 75 m/day.arrow_forward
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