A pumping test was carried out in a confined aquifer 16m thick overlain by an impermeable layer 32 m thick.Rateobservation wells located at 15ofpumping125,000cm3/s ;drawdownsinwascenter of the pumping level wererespectively, from the initialradius of the pumping well is 0.30 m.and 30 m from the1.80 m and 1.30 m,groundwater level. Thea. Compute the transmissivity of the aquifer.b. What is the drawdown at the test well? (1

Using formula for confined aquiferQ=2πT(s1-s2)ln(r2r1)

A pumping test was carried out in a confined aquifer 16 m thick overlain by an impermeable layer 32 m Rate thick. of pumping 125,000 cm3 /s ;drawdowns in was observation wells located at 15 m and 30 m from the center of the pumping level were 1.80 m and 1.30 m, respectively, from the initial groundwater level. The radius of the pumping well is 0.30 m. a. Compute the transmissivity of the aquifer. ( b. What is the drawdown at the test well? (

A pumping test was carried out in a confined aquifer 16 m thick overlain by an impermeable layer 32 m Rate thick. of pumping 125,000 cm3 /s ;drawdowns in was observation wells located at 15 m and 30 m from the center of the pumping level were 1.80 m and 1.30 m, respectively, from the initial groundwater level. The radius of the pumping well is 0.30 m. a. Compute the transmissivity of the aquifer. ( b. What is the drawdown at the test well? (

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 groundwater pump has an unknown discharge extraction rate from a confined aquifer. The thickness is 8mand K=40m/day. To estimate its flow rate, 2 observation wells were installed. The first well is 2.5km from thepump and another well 6.9km from the first well further. The observed drawdown from original water level of150m were 12m in the 1st well and 7m in the 2nd well. If the groundwater pump has a diameter of 0.80m:Determine how far in meters from the pump its influence or no drawdown effect on water table. the answer is 60,033.1092= please provide the solution so that we can understand how they get that correct answer thank you
The static level of water table in an unconfined aquifer was 35m above the underlying impermeable stratum. A 75mm radius well, penetrating the aquifer to its full depth, was pumped at the rate of 28 liters per second. After several weeks of pumping, the drawdown in observation wells 20m and 50m from the well were 3m and 2.5m respectively, and the observed drawdowns were increasing very slowly. (B.Sc., UAE, 1989).a) Assuming equilibrium conditions, estimate the hydraulic conductivity and transmissivity of the aquifer.b) Estimate the drawdown just outside the pumped well.
The static level of water table in an unconfined aquifer was 30 m above the underlying impermeablestratum. A 150 mm diameter well, penetrating the aquifer to its full depth, was pumped at the rate of20 liters per second. After several weeks of pumping, the drawdown in observation wells 20 m and 50m from the well were 3.5 m and 2 m respectively, and the observed drawdowns were increasing veryslowly (B.Sc., DU, 2012).a) Assuming equilibrium conditions, estimate the hydraulic conductivity and transmissivity of theaquifer.b) Estimate the drawdown just outside the pumped well.c) What will be the yield of a 300 mm diameter well which will produce the same drawdowns justoutside the well and at the 50 m distance observation well in (2)? What would be the drawdown at anearer observation well?
A 0.34 m diameter well fully penetrates an unconfined aquifer which is 33.2 m thick. The drawdown at the pumping well is 1.34 m and the permeability of the gravel aquifer is 4.32 * 10-3 m/s. If the flow is steady-state and the discharge is 422.3 lt/min, a- find the drawdown at the site 132.4 m from the center of the pumping well, b- determine the radius of influence ‘r∞’ of this well under that discharge.
A permeability pumping test was carried out in unconfined aquifer with the piezometric level before pumping is 2.18m below the ground surface. The first permeable layer has a thickness of 5.7m measured from the ground surface and the unconfined aquifer is 7.0m deep until reaches the aquiclude at the bottom. At a steady pumping rate of 15.6m^3/hr the drawdown in the observation wells were respectively equal to 1.62m and 0.47m. The distance of the observation wells from the center of the test well were 15m and 32m respectively. If the hydraulic gradient is 0.0092 determine the seepage velocity at 0.25 void ratio?
A permeability pumping test was carried out in unconfined aquifer with the piezometric level before pumping is 2.18m below the ground surface. The first permeable layer has a thickness of 5.7m measured from the ground surface and the unconfined aquifer is 7.0m deep until reaches the aquiclude at the bottom. At a steady pumping rate of 15.6m^3/hr the drawdown in the observation wells were respectively equal to 1.62m and 0.47m. The distance of the observation wells from the center of the test well were 15m and 32m respectively. Compute the Transmissibility?
A permeability pumping test was carried out in unconfined aquifer with the piezometric level before pumping is 2.18m below the ground surface. The first permeable layer has a thickness of 5.7m measured from the ground surface and the unconfined aquifer is 7.0m deep until reaches the aquiclude at the bottom. At a steady pumping rate of 15.6m^3/hr the drawdown in the observation wells were respectively equal to 1.62m and 0.47m. The distance of the observation wells from the center of the test well were 15m and 32m respectively. Compute the hydraulic conductivity?
A pumping test was made in a sand layer extending to a depth of 16m. The initial groundwater table was located 2m below the ground surface. Observation wells were sighted at distances 4m and 9.5m from the pumping well. Using a discharge of 0.4 cubic meters per hour, a steady level is attained at the pumping well. The measured drawdowns at the two observation wells are 2m and 0.25m respectively. Solve the drawdown 5m from the pumping well.
A pumping test was made in a sand layer extending to a depth of 16m. The initial groundwater table was located 2m below the ground surface. Observation wells were sighted at distances 4m and 9.5m from the pumping well. Using a discharge of 0.4 cubic meters per hour, a steady level is attained at the pumping well. The measured drawdowns at the two observation wells are 2m and 0.25m respectively. Solve the hydraulic head 5m from the pumping well.
A well with a diameter of 18 in. penetrates an unconfined aquifer that is 100ft thick. Two observation well are located at 100 ft and 235 ft from the well, and the measured drawdownsare 22.2ft and 21ft, respectively. Flow is steady and the hydraulic conductivity is 1400 gpd/ft^2. What is the steady-state rate of discharge from the well?
) A pumping test carried out in a 50 m thick confined aquifer resulted in a flow rate of 600l/min. The thickness of the impermeable layer above the aquifer is 20 m and the originalwater level in the well was 2 mm below the ground surface (which is also the top of theimpermeable layer). Drawdowns in two observation wells located 50 m and 100 m fromthe well are 3 and 1 m respectively. Calculate:i) The coefficient of permeability of the aquifer, ii) The drawdown in the well, iii) The radius of influence. The diameter of the well is 0.6 m.
Four wells located at the corners of a square area with side length of 50 m are to be used to control the water table elevation below a construction site. If the saturated thickness of the aquifer at a fully penetrating stream 60 m from the near two wells is 30 m, calculate the minimum discharge (same for four wells) rate to maintain at least a drawdown of 6 m at the center of the construction site. K = 1 m/d Pls fast hand written solution