A lake has maximum depth of 60 m. If the mean atmospheric presssure in the lake region is 91 kPa and the unit weight of the lake water is 9790 N/m3, the absolute pressure (in kPa, round off to two dcimal places) at the maximum depth of the lake is |||
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- A sand layer of 3 m thick lies on a 3 m clay deposit. The water table is below 2 m of the ground surface. There is a 1 m capillary rise above the water table. Below the clay, there is a 2 m of a sand layer that lies on a bedrock. Piezometers installed at the bottom of the clay layer show an artesian pressure, the piezometric level being 1 m above the ground surface. The saturated and dry unit weight of the sand is 18 and 16 kN/m3, respectively. The saturated unit weight of the clay is 20 kN/m3. An embankment is going to be placed at the ground surface and will apply a 30 kPa uniform surcharge. Calculate and draw the total, pore pressure, and effective stress profiles for the following conditions.a) before the embankment is placedb) immediately after the embankment is placedc) long after the embankment is placedC A lake has maximum depth of 60 m. If the mean atmospheric presssure in the lake region is 91 kPa and the unit weight of the lake water is 9790 N/m3, the absolute pressure (in kPa, round off to two dcimal places) at the maximum depth of the lake isA 3.2 meter thick silty sand stratum intersects one side of a reservoir. The stratum has a hydraulic conductivity of 4 x 10-² cm/sec and exceeds along the entire 1000-m length of the reservoir. Compute seepage loss per month. el. 167.3 m Reservoir Clay Silty sand Observation well Clay 256 m - el. 165.0 m 3.2 m
- 1. A piezometer point is 35 m above mean sea level. The fluid pressure in the aquifer at that point is 6.70 x 10E+6 N/m2. The aquifer has fresh water at a temperature of 15 degree C. a) What is the point water pressure head? b) What is the total head?An artifical recharge pond is located in a sandy area (Kv = 10 m/day; porosity = 30%). The pond covers a large area. A flood wave fills the pond rapidly to a water level of 5.5 meters above the sandy bottom. By controlling the inflow and outflow the water level is maintained at this elevation. During previous operations, the bottom of the pond was covered by a layer of fine material 0.5 meters thick with Kv = 0.1 m/day and a porosity of 50%. Assuming infiltration is vertically downward only, determine the position of the wetting front from the recharge pond into an initially dry soil as a function of time (derive an equation). Assume a very deep water table. What is the infiltration after a long time?Precipitation The area between the isohytes 0.45 m and 0.55 m is 100 Sq.km and between 0.55 m and 0.65 m is of 150 Sq.km. The average depth of annual precipitation over the above basin of 250 Sq.km will be
- A confined aquifer has a source of recharge. The hydraulic conductivity of the aquifer is 40 m/day and its porosity is 0.25. The piezometric head in the two wells 1000m apart is 65 m and 60 m respectively from a common data. The average thickness of the aquifer is 25 m and the average width is 4 km. Compute the flow rate through the aquifer in m3/day.Compute the effective pressure in kPa at a depth of 15 m below the bottom of a lake 6 m deep. The bottom of the lake consists of soft clay with a thickness of more than 15 m. The average water content of the clay is 40% and the specific gravity of soils may be assumed to be 2.65.A tube-well of 20 cm of diameter fully penetrate a horizontal, homogeneous and isotropic confined aquifer of infinite horizontal extent. The aquifer is of 30 m uniform thickness. A steady pumping at the rate of 40 litres/s from the well for a long time results in a steady drawdown of 4 m at the well face. The subsurface flow to the well due to pumping is steady, horizontal and Darcian and the radius of influence of the well is 245 m. The hydraulic conductivity of the aquifer (in m/day, round off to integer) is
- A confined aquifer has a source of recharge. The hydraulic conductivity of the aquifer is 40 m/day and its porosity is 0.25. The piezometric head in the two wells 1000m apart is 65 m and 60 m respectively from a common data. The average thickness of the aquifer is 25 m and the average width is 4 km. Compute the seepage velocity.A confined aquifer has a source of recharge. The hydraulic conductivity of the aquifer is 40 m/day and its porosity is 0.25. The piezometric head in the two wells 1000m apart is 65 m and 60 m respectively from a common data. The average thickness of the aquifer is 25 m and the average width is 4 km. Compute the time of travel from the head of the aquifer to a point 3 km downstream in months. Rund off to the nearest whole number. 1 month = 30 daysA confined aquifer has a source of recharge. The hydraulic conductivity of the aquifer is 40 m/day and its porosity is 0.25. The piezometric head in the two wells 1000m apart is 65 m and 60 m respectively from a common data. The average thickness of the aquifer is 25 m and the average width is 4 km. Compute the time of travel from the head of the aquifer to a point 3 km downstream in months. Round off to the nearest whole number. 1 month = 30 days %3D