Due to a continuous pumping for 7 hrs from a catchment of 25 ha, having porosity of 30% and specific retention of 10%, groundwater level dropped by 1 m. The corresponding change in storage is:
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- b. An aquifer with a potentiometric surface is 50 m thick and 500 m wide. Two observation wells are located 1400 m apart in the direction of flow. Head in the first well is 50m and in the second well is 42m. Hydraulic conductivity is 0.7 m/d. Effective porosity of the medium is 20%. Determine the total flow of the water through the aquifer. Also determine the actual groundwater velocity between the two wells.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.(b) Give the characteristics of different formations in which groundwater exists. A fully penetrating artesian well is discharging at a rate of 25 litres/sec. The storage coefficient and transmissivity of the aquifer are 4.5 × 104 and 0.15 m²/min respectively. Find the drawdown at (i) A radius of 5 m distance after 2 hours pumping. (ii) A radius of 150m distance after one day pumping. Use the following approximation well function W(u) = -0.5772 - In(u) - u.
- 49. 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. Determine the coefficient of permeability of the soil.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?2. An artesian well is pumped at the rate of 25 liters/sec. at observation wells 170m and 340m away the drawdowns noted are 0.83m and 0.67m respectively. The average thickness of the aquifer at the observation wells is 6.5 meters. Compute the coefficient of permeability of the aquifer if the water level was 15 meters before pumping. 340 m 170 m Q= 25 liters normal hyd. grade line 0.83 15m h2 hi impermeable layer t= 6,5 mm Aquifer
- 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.In a field testing, the hydraulic gradient between two peizometers is 1.11, the area of flow is 4.08 m2 and the hydraulic conductivity of the aquifer material is 0.94 m/day, calculate the discharge in m3/day. Note that discharge cannot be negativeWater flows through a fully confined sand aquifer with a piezometric head gradient of 0.025.(a) If the hydraulic conductivity and effective porosity of the aquifer are 1.72 m/d and 0.45, respectively, estimate the specific discharge and seepage velocity in the aquifer.(b) estimate the volumetric flow rate of the groundwater if the aquifer is 45 m deep and 1.2 km wide.(c) How long does it take a dissolved contaminant in the groundwater to move 1 km?
- A pumping test was carried out in a confined aquifer 16 m thick overlain by an impermeable layer 32 m thick. Rate observation wells located at 15 of pumping 125,000 cm3/s ;drawdowns in was center of the pumping level were respectively, from the initial radius of the pumping well is 0.30 m. and 30 m from the 1.80 m and 1.30 m, groundwater level. The a. Compute the transmissivity of the aquifer. b. What is the drawdown at the test well? (1A permeability pumping test was carried out in a confined aquifer with the piezometric level before pumping of 2.18m below the ground surface. The aquiclude has a thickness of 5.7m measured from the ground surface and confined aquifer is 7.6m deep until it reaches the aquiclude at the bottom. At a steady state pumping rate of 15.6 ?7??6?3/?2h?7??1? the drawdown in the observation wells were respectively equal to 1.62m and 0.47m. The distances of the observation wells from the center of the test well were 15m and 32m respectively. The radius of the test well is 1m. Determine the coefficient of permeability (m/hr) Select the correct response: 2.15x10-5 0.215 0.597 5.97x10-5Q3: A reservoir with An initial capacity of (30000 acre-ft) .If the average annual inflow is (30000 acre-ft), And the average annual sediments is (250,000 Tons). The Sediments Deposits Which Transport To A Reservior Is (Silty) And The Reservior Is (Normally Moderate Drawdown) (7₁-65 pcf ,B=2.5 pcf,T=100 Years ).. The useful life of the reservoir will be terminate when one-thirds of It's initial capacity is filled with water. Find : 1- The probable life of A reservoir, and? 2- The storage capacity at the end of 100 yrs?