2. In the design of a borehole, the radius of influence R cannot be established precisely and, therefore, is commonly assumed to be 200 m. For a well of radius, rw 250 mm and transitivity T= 0.0208 s1 that is to supply 15 m/hr, determine: i. Drawdown below which the pump must be placed ii. The percentage error in drawdown if the correct radius of influence was 300 m. 2.72TZW Assume the borehole yield Q) %3D log. R /r

2. In the design of a borehole, the radius of influence R cannot be established precisely and, therefore, is commonly assumed to be 200 m. For a well of radius, rw 250 mm and transitivity T= 0.0208 s1 that is to supply 15 m/hr, determine: i. Drawdown below which the pump must be placed ii. The percentage error in drawdown if the correct radius of influence was 300 m. 2.72TZW Assume the borehole yield Q) %3D log. R /r

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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4. A confined aquifer of 10-m thickness and 16.43 m/day hydraulic conductivity is fully penetrate by a pumping well of 0.5 m radius operating at Q=425 m³/day. Determine the drawdown under steady-state conditions in a) the pumping well and b) 50 m away from the well. Take the radius of influence of the pumping well as 300 m.
(ii) In a hydraulic jump occurring in a horizontal channel, the Froude's number before the jump is 10.0 and energy loss is 3.2 m. Estimate sequent depths, discharge intensity and Froude's number after the jump.
.A confined aquifer of 15 m constant thickness is sandwiched between two aquicludes as shown in the figure (not drawn to scale) Piezometer P 55.2m Piezometric Surface Aquiclude Aquifer Aquiclude Piezometer Q L = 2500m 34.1m The heads indicated by two piezometers P and Q are 55.2 m and 34.1 m, respectively. The aquifer has a hydraulic conductivity of 80 m/ day and its effective porosity is 0.If the distance between the piezometers is 2500 m, the time taken by the water to travel through the aquifer from piezometer location P to Q (in days, round off to 1 decimal place) is
9) A well is located in a confined aquifer near the intersection of a constant head and impervious boundary. a) Estimate the steady state drawdown in the well for Q=2 ft³ s, rw = 1 ft, distance from the well to stream= 300ft and distance from well to impervious boundary= 150 ft. T = 0.14ft²/s b) Estimate the steady state drawdown at point P located midway between the well and the steam. The angle between the stream and the impervious boundary is 90°
Q7: The channel shown in the figure and has a surface of flout finalized concrete 0.1m per 100m of length calculate the discharge (Q) and Froude number (Fr) for a depth of 1.5m, assume n-0.0015 determine Fr is critical, subcritical or supercritical? y=D=1.5m h -3.0m 3 2
A confined aquifer of 15 m constant thickness is sandwiched between two aquicludes as shown in the figure (not drawn to scale) 55.2 m BT Peizometer P Reference Datum Aquiclude Piezometric Surface Aquiclude Peizometer Q L = 2500 m 34.1 m ונטוב SOM The heads indicated by two piezometers P and Q are 55.2 m and 34.1 m, respectively. The aquifer has a hydrau- lic conductivity of 80 m/day and its effective porosity is 0.25. If the distance between the piezometers is 2500 m, the time taken by the water to travel through the aquifer from piezometer location P to Q (in days, round off to 1 decimal place) is
Q2) For the concrete dam in Fig. 2, calculate the 1) seepage quantity in cm³/sec, and 2) pore water pressure (u) in the points 1 to 7 at the bottom of the dam. (yw = 10 kN/m³). the Nd. 1.5 m 10 m 3 1 .} 4 (k = 10-³ cm/sec) } 1 1 1 24 m " R I 1 1 Figure 2.
A hydraulic jump takes place in a rectangular channel downstream of a spillway. The flow in the channel is Q =900 cfs. The conjugate depth (y1) upstream of the jump was measured at 1.4 feet. The channel width is B = 15feet. (a) Compute the conjugate depth y2 downstream of the hydraulic jump.(b) What type of jump are we looking at in this problem? Refer to the five types presented (in the figureabove) by Prof. Ven Te Chow, the father of watershed hydraulics and physical hydrology.(c) Evaluate the specific energies E1 and E2 at points 1 and 2 (upstream and downstream of the jump,respectively) and the specific energy Ec corresponding to the critical depth yc. Then annotate thespecific energy diagram below with the values of y1, y2, yc, E1, E2, and Ec.(d) How much is the head loss in the hydraulic jump? Explain your answer.
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TELEGRAM Q1: A 30cm diameter well penetrates vertically through an aquifer to an impermeable stratum located 18.0 m below the static water table. After a long period of pumping at a rate of 1.2 m3/min, the drawdown in test holes 11m and 35 m from the pumped well is found to be 3.05 and 1.62m respective. What is the hydraulic conductivity of the aquifer? Express in meters per day. What is its transmissivity? Express in cubic meters per day per meter. What is the drawdown in the pumped well?
Situation 2: An open cylinder vessel 1.2 m in diameter contains water at a depth of 3.75 m. 3) If it is rotated at a speed of 85 rpm about its vertical axis, determine the least depth (m) of the vessel so that no water will be spilled out. A) 4.0 B) 4.2 C) 4.5 D) 4.7
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