An unconfined aquifer has a porosity of 0.45, and specific yield is 0.25. The dimension(s) of the aquifer is: 60 m of length, and 80x2 m2 cross sectional area. Estimate the groundwater volume that can be withdrawn or available from the aquifer.
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An unconfined aquifer has a porosity of 0.45, and specific yield is 0.25. The dimension(s) of the aquifer is: 60 m of length, and 80x2 m2 cross sectional area. Estimate the groundwater volume that can be withdrawn or available from the aquifer.
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- Refer to Figure 7.24. The following data were collected during the field permeability measurement of a confined aquifer using a pumping test. Determine the hydraulic conductivity of the permeable layer. Use Eq. (7.49). Thickness of the aquifer, H = 4.5 m Piezometric level and radial distance of the first observation well: h1 = 2.9 m; r1 = 17.8 m Piezometric level and radial distance of the second observation well: h2 = 1.8 m; r2 = 8.1 m Rate of discharge from pumping, q = 0.5 m3/minA 0.3 m well has a 25 m long screen that covers the entire depth of an aquifer. The aquifer medium has an effective grain size of 1.5 mm. The well is pumped at a rate of 0.2 m³/s. Assess the validity of Darcy's law near the well. Assume, porosity = 0.25 (Dynamic viscosity of water at 20°C is 1.005*10-3 Ns/m2)Calculate specific yield of an aquifer if a = 9.9 and B = -0.60 %3D Discharge = 80 L/s Max drawdown = 0.8 m Saturated thickness = 20 m O 0.20 O 0.40 O 0.10 0.30
- 2. A confined aquifer is recharged by a continuous supply of water from the certain source. The average thickness of the aquifer was determined to be 25 m and the average width is 4 km. The hydraulic conductivity of the aquifer was obtained at 40 m/day and its void ratio is 0.3333. The piezometer heads in two wells 1.325 km apart are 65 meters and 60 meters from a common reference datum. Determine the rate of flow in cubic meters per day. Determine: •compute the rate of flow through the aquifer in m3/day •compute the seepage velocity in m/day •compute the time of travel from the head of the aquifer to a point 8 km downstream in daysThe hydraulic conductivity of an aquifer is 0.002 cm/sec, the hydraulic gradient is 0.004, and the porosity is 0.3. The aquifer is 5 meters thick (b). What it is its transmissivity (T) in cm2 / sec. ? Enter your answer to the nearest tenth.3. (Modified version of Problem 5.39 in the text). An unconfined sand aquifer with a surface area of 10,000 m? experiences a 1 m water level drop. The porosity and specific yield for the sand aquifer are given as 0.34 and 0.25, respectively. a. Calculate the volume of water that would be released from the aquifer. m3 b. How much water would remain in the drained portion of the aquifer?
- 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 silty-sand aquifer has a hydraulic conductivity of 10-4 cm/s. Two piezometers are located 300 m apart and indicate groundwater elevations of 12m and 10m above a datum. The porosity of the aquifer is 0.30. (a) What is the specific discharge in this aquifer? (b) What is the maximum velocity that a salt tracer would move in this aquifer? (c) Assuming that the aquifer is 8 m in depth, what is the discharge per meter perpendicular to the water flow?The contaminant concentration has been detected to be 200 mg/L for the area of a site represented below. The groundwater contours are spaced at intervals of about 50 m. The average thickness of the aquifer is 5 m and the hydraulic conductivity is 1x10-2 cm/s. For each meter of length (unit length) as measured parallel to the river, what is the contaminant loading rate (i.e., C x Q) in kg/year?
- Q-7 Water table of an aquifer drops by 100 cm over an area of 1000 km². The porosity and specific retention of the aquifer material are 25% and 5%, respectively. The amount of water (expressed in km³) drained out from the area is.An aquifer is spread over 300 Ha. The water table in the aquifer was 6 m below the ground surface. A drawdown of 3 m was observed after sometime. Find the change in the ground water storage if the porosity of the aquifer is 0.43 and the specific retention is 0.15.A 30 cm well penetrates 45 m below the static water table. After a long period of pumping at a rate of 1200 lpm, the drawdown in the wells 20 m and 45 m from the pumped well is found to be 3.8 and 2.4 m respectively. Determine the transmissivity (-K*aquifer thickness) of the aquifer. What is the drawdown in the pumped well? [Hint: Use water table depth as aquifer thickness in the case of unconfined aquifer]