A pumping test was carried out in a soil bed of thickness 20m and the following measurements were recorded. • Rate of pumping = 9.5x103 m³/s • Drawdowns in observation wells %3D located at 13m and 33m from the center of the pumping well were 2.00m and 1.27m, respectively from the initial groundwater level. • Initial groundwater level was located at 1.9m below ground level. Determine hydraulic conductivity in cm/s

A pumping test was carried out in a soil bed of thickness 20m and the following measurements were recorded. • Rate of pumping = 9.5x103 m³/s • Drawdowns in observation wells %3D located at 13m and 33m from the center of the pumping well were 2.00m and 1.27m, respectively from the initial groundwater level. • Initial groundwater level was located at 1.9m below ground level. Determine hydraulic conductivity in cm/s

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter11: Ground Improvement

Section: Chapter Questions

Problem 11.7P

See similar textbooks

Similar questions

A pumping test was carried out in a soil bed of thickness 15 m and the following measurements were recorded. Rate of pumping was 10.6 x 10^-3 m3/s ; drawdowns in observation wells located at 15 m and 30 m from the center of the pumping well were 1.6 m and 1.4 m,Trespectively, from the initial groundwater level. The initial groundwater level was located at 1.9 m below ground level. Determine k in cm/s. a. 2.6 x 10^-6 b. 5.0 x 10^-2 c. 3.47 x 10^-2 d. 6.7 x 10^-1
The following results are obtained for a liquid limit test using a fall cone device. Cone Moisture penetration, d (mm) content (%) 13 26.3 19 31.9 26 39.3 31 42.6 Estimate the liquid limit of the soil and the flow index. For estimating the flow index use wi and w4. Round your final answers to three significant figures. LL IFC
3. Calculate the effective concentrations of p-NPP and AP in the wells.
DETERMINE: a. Rate of seepage into the well during pumping
for the following conditions, determine the groundwater infiltration. new two lane highway, lane width 12ft; shoulder width 10ft; length of crack 20ft; rate of infiltration 0.5ft^3/day/ft^2; spacing of crack 25ft kp=15*10^-5 ft/day
Books - Study Career Life Problem 7) The following data are obtained from a liquid limit test. Draw the flow curve and determine LL value of the soil. Blow Count, N Water Content,% 55 23.5 43 27.9 22 36.4 15 45.3 (Use lincar scale)
Assignment no. 3 Problem # 1. A 300 mm diameter test well penetrates 24 m. below the static water table. After 24 hours of pumping at 69 liters/sec. The water level in an observation well at a distance of 96m from the test well is lowered 0.60m. And the other observation well at a distance of 34m from the test well, the drawdown is 1.2m. a. Compute the coefficient of permeability of the unconfined aquifer in m/day. b. Compute the transmissibility of the unconfined aquifer in m2/day. Compute the transmissibility of a confined aquifer 8m. thick below the unconfined aquifer in m2/day. I.
Lecturer: Roozbeh Safaeian Amoly Duration: 90 minutes 1. A soil sample 15 cm in diameter is placed in a tube 3 m long. A constant supply of water is allowed to flow into one end of the soil at A, and the outflow at B is collected by a beaker as shown in the figure. Determine (a) hydraulic gradient, (b) flow rate, (c) average velocity, (d) seepage velocity if e 0.7, and (e) hydraulic conductivity, if the average amount of water collected is 3 cm for every 20 seconds. 10 kPa 1.4 m F 1 5m-- 15m-- 1sm-l- 1.5m-| B A Soil 2m Exit Datum 1.75 m 15m
Lecturer: Roozbeh Safaeian Amoly Duration: 90 minutes 1. A soil sample 15 cm in diameter is placed in a tube 3 m long. A constant supply of water is allowed to flow into one end of the soil at A, and the outflow at B is collected by a beaker as shown in the figure. Determine (a) hydraulic gradient, (b) flow rate, (c) average velocity, (d) seepage velocity if e 0.7, and (e) hydraulic conductivity, if the average amount of water collected is 3 cm' for every 20 seconds. 10 kPa ttt 1.4 m 1.5m- 15m- 15m-- 1.5m- B Soil C. Exit Datum 2m 1-5 m 15m 11:00 口 4) 2.06.2021
4 Homework 1. Dervie and prove Table 2. 9.1 Water injection is carried out in a 50 ft thick, 300 ft wide, and 400 ft long grid- block (much like a rectangular core, called gridblock in reservoir simulation terminology), which has a porosity of 33% and absolute permeability of 500 mD. The injection of water is carried out at a residual oil saturation of 20%. The pressure drop across the gridblock is 5 atm. The relative permeability of water (k) at residual oil saturation of 20% or water saturation of 80% is 0.67. Water viscosity is 1.0 cP. Calculate the water flow rate in barrels/day. 9.3 An oil-water SS displacement experiment was carried out on a 5.0 cm long and 3.0 cm diameter sandstone core plug. The porosity of the plug is 25% and the grain density is 2.65 g/cm³. Oil and water densities are 0.85 g/cm³ and 1.05 g/cm³, while viscosities are 2.0 cP and 1.0 cP, respec- tively. The differential pressure for the test is 12.94 psi. Other data are provided in the following table. Calculate…
If an analysis is made of the hydraulic conductivity of a site using permeameter tests of core samples, slug tests of monitoring wells, and pumping tests of production wells, it is often observed that the hydraulic conductivity as measured by each method is different. Which method would be most likely to have the greatest hydraulic conductivity, and which the least? What are some possible reasons why this would be true?
Determine the time of concentration for use in the NRCS method for a drainage basin located in Hardin County, Ohio having the hydraulic path described below:Overland Average Grass L = 100’ S = 1.6% n = 0.24Shallow Concentrated L = 680’ S = 3.2%Stream Flow L = 2950’ S = 0.61% Cross Sectiono B = 12’o T = 20’o y = 4’o n = 0.035 COUNTY 2-yr ; 5-yr ; 10-yr ; 25-yr ; 50-yr ; 100-yr HARDIN 2.5 ; 3.0 ; 3.5 ; 4.2 ; 4.7 ; 5.3