A test well with a diameter of 350mm reached 27 meters below the static water table. The water table level at an observation well 80 meters from the test well is dropped 0.5 meters, and the water table level in another observation well 40 meters away is lowered 0.5 meters after 24 hours of pumping at 85 liters per second. The descent is 0.9m from the test well. 3 m³ day b.) Compute the coefficient of permeability of the aquifer in m/day a.) What is the rate of flow in Ground lovel Water table before puding Testet Drain dese cuEY'S during pomping (dr dh

A test well with a diameter of 350mm reached 27 meters below the static water table. The water table level at an observation well 80 meters from the test well is dropped 0.5 meters, and the water table level in another observation well 40 meters away is lowered 0.5 meters after 24 hours of pumping at 85 liters per second. The descent is 0.9m from the test well. 3 m³ day b.) Compute the coefficient of permeability of the aquifer in m/day a.) What is the rate of flow in Ground lovel Water table before puding Testet Drain dese cuEY'S during pomping (dr dh

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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A pumping test in an aquifer has yielded the following data: A pumping well with a diameter of 15 cm pumps at a rate of 12 m³/day, and draws the aquifer down by 3.6 m. Drawdown at a monitoring well 20 m away is 1.1 m. a) Calculate the Transmissivity of the aquifer. Assume this number is representative of the entire aquifer. b) Determine saturated hydraulic conductivity, and identify a soil type from table 7.2 in the Margulis book. The aquifer thickness is 20 m. ●
An unconfined aquifer is 10 m thick and is being pumped so that one observation well placed at a distance 76 m shows a drawdown of 0.5 m. On the opposite side of the extraction well is another observation well 100 m from the extraction well, shows a drawdown of 0.3 m. Assume the coefficient of permeability of 50 m/day. a.) What is the discharge f the extraction well? b.) Suppose the well at 100 m from the extraction well is now pumped. Show with a sketch what this will do to the drawdown. c.) Suppose the aquifer sits on an aquaclude that has a slope of 1/100. Show with a sketch what this will do to the drawdown.
A clay sample is 2.5 cm high and has a diameter of 6.5 cm. It is placed in an oedometer with a variable- head permeameter. The water percolation through the sample is measured in a standpipe whose inner diameter is 1.7 mm. The tube is graduated in centimeters from the top to the bottom. The top graduation is zero and is located 35 cm above the base of the oedometer. The overflow in the oedometer is 3 cmabove its base. At the start of the test, the water level in the tube is at zero; 6 mins and 35 sees later, the water level has dropped to graduation 2. What is the coefficient of permeability of the clay in cm/s?
Q3. A 200 mm diameter well which fully penetrating a confined aquifer of thickness 25 m is pumped at a constant rate of 2000 m3/day. The steady state drawdown in the well is 8 m and the drawdown in a piezometer 100 m from the well is 1.4 m.(a) Ignoring well losses, calculate the transmissivity of the aquifer, the hydraulic conductivity of the aquifer material and the radius of influence of the well.(b) Repeat the calculation for an unconfined aquifer with saturated thickness 25 m
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°
A field pumping test was conducted from an aquifer of sandy soil of 4 m thickness confined between two impervious strata. When equilibrium was established, 105 liters of water was pumped out per hour. The water elevation in an observation well 3.50 m away from the test well was 2.1 m and another 6.0 m away was 2.7 m from the roof level of the impervious stratum of the aquifer. Find the value of k of the soil in m/sec.
A falling head hydraulic conductivity test is performed on a sample of soil. The stand pipe having a diameter of 0.20cm is observed and it takes 60 seconds for the water to drop by 50 cm from an initial hydraulic head of 90cm. The sample has a length of 20cm, and a diameter of 4cm. a.Find the coefficient of permeability (cm/sec) b.Solve for the hydraulic gradient c. Compute the rate of flow of water in the soil. (cm' /sec.) 0.20 cm 6 s TAND PIPE 50cm Acm 不 20am -: SOIL
Problem (4) The following results have been reported for field pumping test from a well, where the top permeable layer is unconfined and underlain by an impermeable layer, for a steady state condition: m3 q = 0.68 min h, = 5.6m at r, = 60m h, = 5m at r, = 30m Calculate the hydraulic conductivity (cm/s) of the permeable layer.
A pumping test was made in sands extending to a depth of 20m where an impermeable stratum was encountered. The initial ground-water level at the ground surface. Observation wells were sited at distance of 4 and 9m from the pumping well. A steady state was established at about 20 hours when the discharge was 4.20 liters per second. The draw downs at the two observation wells were 1.7m and 0.85m. Calculate the coefficient of permeability. original ground water levelT (level at ground surface) 9m 4m Q= 4.2 liters/s O.85 20m h2 SAND Impermeable stratum
9.An unconfined aquifer with K-30 m/day is bounded by a stream on one side as shown in Figure 2, At a distance of 80 m from the stream, a well of 0.4 m diameter is pumped at rate of 3000 m³/day. What is the drawdown in the well? Q=3000 m³/day 20 m m 801 Figure 2 C C d=0.4 m K=30 m/day Impermeable Layer m³ / day
2. (a) A well in an aquifer is pumped over a long period at a rate of 0.05 m3 /s under approximate steady-state conditions. The steady-state drawdowns, from the water table level, at two observation wells at 25 m and 50 m from the abstraction well were observed to be 15.3m and 9.5m, respectively. If the saturated thickness of the aquifer prior to pumping is 80 m, determine the hydraulic conductivity of the aquifer material. (b) Will the actual drawdown in the pumping well be more than the theoretical drawdown? If yes, why and what measures can you recommend for reducing the drawdown in the pumping well?
A well in an unconfined aquifer is pumped at the rate of 50 L/s ( 800 gal/min.). The thickness of the aquifer is 30 m. and the elevation of the phreatic surface is 25 m. above the underlying aquiclude at an observation of well 20 m away from the well and 34.6 m above at a well 50 m. away. What is the value of K for this aquifer?