A 300 mm diameter test well penetrates 24 m below the static water table. After 24 hours of pumping at 70 liters per second, thewater level in an observation well at a distance of 96 m from the test well is lowered by 0.60 m and the other observation well at adistance of 34 m from the test well, the drawdown is 1.2 m.1. Compute the coefficient if permeability of the unconfined aquifer in m/day.2. Compute the transmissibility of the unconfined aquifer in m2/day.

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Answered: A 300 mm diameter test well penetrates…

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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Could you help me answer the following question? Thank you A fully penetrating pumping well extracts groundwater from a confined aquifer with a pumping rate of 750 m3/day. The hydraulic conductivity of the aquifer is 10 m/day and the saturated thickness is 50 m. The drawdown of the aquifer from this pumping well is insignificant at a distance of 1000 m from the pumping well. At what distance from the pumping well is the drawdown 10 cm? Assume the hydraulic gradient is negligible in the local area. Transmissivity T = 1746.76 gal/min/ft Hydraulic conductivity = 11.645 gal/min/ft2 Storativity = 0.809 The drawdown on Jenny’s Well by the end of August. =0.6902 ft. Observation well situated is 69.7 ft away from the pumping well (which is pumping at the rate of 305 gal/min). The aquifer is confined, and the depth has been measured from well logs and is 150 ft. The data for time (t) and drawdown (s) is given below: t (min) s (ft) 0.072 0.003 0.105 0.006 0.155 0.012…
An unconfined aquifer is 100 feet thick was evaluated using a field pumping test. The depth to groundwater is 10 feet. At a distance of 1000 feet, the drawdown was 40 feet, and at a distance of 5000 feet it was 20 feet. Find the permeability of the aquifer assuming that a steady-state of 960 gal/minute during the test in ft/sec.
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: Find the transmissivity in ft^2/day and hydraulic conductivity in ft^2/day Find the radius of influence in feet.
A 400 mm diameter test well penetrates 27 m below the static water table. After 24 hours of pumping at 75 liters/sec, the water level in an observation well at a distance of 100 m from the test well is lowered 0.35 m. The other observation well at a distance of 40 m from the test well has a drawdown of 0.97 m. Compute the transmissibility of the aquifer in m?/day.
With units please
The thickness of a horizontal, confined, homogeneous, isotropic aquifer of infinite areal extent is 30m. A well fully penetrating the aquifer was continuously pumped at a constant rate of 0.1 m³/s for a period of 1 day. The drawdowns given in the table below were observed in a fully penetrating well 90 m from the pumping well. Compute the transmissivity and the storativity by using: a) the Theis method of log-log matching. b) the Cooper-Jacob method of semi-log plotting. [For Part a), you have to first use attached Table to plot the values of W(u) versus 1/u on a log-log graph in the range of 10-9
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. ●
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°
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

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