Calculate specific yield of an aquifer if a = 9.9 and ß = -0.60 Discharge = 80 L/s Max drawdown = 0.8 m Saturated thickness = 20 m 0.20 0.30 0.40 0.10
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- From the figure shown, the thickness of permeable layer is 1.1m making an angle of 14 degrees with the horizontal. K= 4.87x10^-12 cm/sec. If the vertical thickness depth of the aquifer at point of the first piezometer (left) is 1.5m and the other point at second piezometer is 1.1m, determine the area of flow. h=1.4 m Direction impervious layer of seepage 3 m 14 1.1 m impervious layer 14 -36 m-cademic) X = 4 km If aquifer hydraulic gradient, hydraulic conductivity and effective porosity are found to be 0.4, 0.5 m/day and 0.2 respectively, determine how long the contaminants have been in the aquifer (in years)? 1 year = 365 days %3DFrom the figure shown, the thickness of permeable layer is 1.1m making an angle of 14 degrees with the horizontal. K= 4.87x10^-12 cm/sec. If the vertical thickness depth of the aquifer at point of the first piezometer (left) is 1.5m and the other point at second piezometer is 1.1m, determine the seepage velocity. h=1.4 m Direction of seepage impervious layer 3 m 14 1.1 m impervious layer 14 -36 m-
- 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?10.17. Determine the relative movement of a contaminant front in an aquifer subject to the following conditions. The Kow value for the contaminant is 100. the porosity of the aquifer is 0.2. the bulk density of the aquifer material is 2.0 x 106 g/m³, and the fraction of organic carbon in the soil is 0.15. 10 19 10.17 S nn WA confined aquifer shown has hydraulic conductivity of 52 m/day with void ratio of 0.282. The average thickness is 30 m and the average width is 4 km. el = 85 m el = 55 m 80 m aqulfer 1400 m Determine the nearest value of the tirne of travel from the head of aquifer to a point 5.2 km downstream in days (in a whole day).
- . A natural soil deposit has a bulk unit weight of 18.44 kN/m3and water content 5%. Calculated theamount of water required to be added to 1 m3soil to raise the water content to 15%. Assume thevoid ratio remains constant. What will then be the degree of saturation? Take Gs as determined inquestion no. 2. G=2.692. 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 days6. Two observation wells have been constructed in the confined aquifer shown below. If the flow rate (Q) is 0.01 m³/hr/unit width, Porosity, n= 0.26, effective porosity=0.23 and and compressibility of aquifer matrix is a = 10-8 ms2/kg: compressibility of water, B = 45.8 x10 11N/m² i. ii. lii. 20 m K₁-15 miday 300m K₂-7 K₁-10 m/day Determine K2 what is the effective hydraulic conductivity (K) for the system Calculate transmissivity and Storativity
- Q 3 .An aquifer has following different formations, their thickness and Hydraulic conductivity are given below. Assume that each formation is isotropic and homogeneous. Compute both the equivalent horizontal and vertical hydraulic conductivities Formation Thickness (m) Hydraulic Conductivity ( m/day) 6 27.4 2 14 18.8 3 16 25.2 4 21 22.6 17 23 6 23 30.4 22 33.8 8 33 47.2 9 33 31.6 10 40 52 11 41 66.4 12 43 69.8 13 45 53.2 14 45 63.6 15 55 77 16 52 63.4 17 55 62.8 18 58 62.2 19 62 93.6 20 65 93 21 71 83.4 22 70 97.8 23 75 96.2 24 79 111.6 25 83 114 26 84 116.4 27 86 119.8 28 93 109.2 29 91 112.6 30 98 104 31 101 109.4 32 99 109.8 33 102 131.2 34 104 128.61. 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 18 m and the average width is 8 km. The hydraulic conductivity of the aquifer was obtained at 60 m/day and its void ratio is 0.1586. The piezometer heads in two wells 2,145m apart are 128 meters and 188 meters from a common reference datum. 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 daysA confined aquifer of 15 m constant thickness is sandwiched between two aquicludes as shown in the figure (not drawn to scale) Piezometer P 55.2 m Piezometric Surface Aquiclude Aquifier: Piezometer Q Aquiclude 34.1 m L = 2500m The heads indicated by two piezometers P and Q are 55.2 m and 34.1 m, respectively. The aquifer has a hydraulic conductivity of 80 m/day and its effective porosity is 0.25. If the distance between the piezometers is 2500 m, the time taken by the water to travel through the aquifer from piezometer location P to Q (in days, round off to 1 decimal place) is