CALCULATION USING DARCY'S LAW An aquifer system is formed by two horizontal layers. Two piezometers were installed for monitoring, the distance between them is 885m. The upper layer (A) has a thickness of 39m and K = 1.3 x 10-5 m/s and the lower layer (B) has a thickness of 25m and K = 2.7 x 10-6 m/s. THE hydraulic load in the PZA is 60m and in the PZB it is 40m. Calculate the flow and the transmissivity of each layer.

CALCULATION USING DARCY'S LAW An aquifer system is formed by two horizontal layers. Two piezometers were installed for monitoring, the distance between them is 885m. The upper layer (A) has a thickness of 39m and K = 1.3 x 10-5 m/s and the lower layer (B) has a thickness of 25m and K = 2.7 x 10-6 m/s. THE hydraulic load in the PZA is 60m and in the PZB it is 40m. Calculate the flow and the transmissivity of each layer.

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter7: Seepage

Section: Chapter Questions

Problem 7.1P

See similar textbooks

Similar questions

A pump well is dug through a confined aquifer having a thickness of 32 meters. The piezometric surface of the aquifer is 18 meters measured from the top impermeable layer. The first observation well is 75 feet directly west of the pump well and the second observation well is 75 feet directly north of the first observation well. Determine the hydraulic conductivity of the aquifer if it supplies a discharge of 10 liters per second and the drawdown of the observation wells are 13 feet and 23 feet.
A aquifer of an medium to coarse grained sand aquifer. It is 12.19 thick and 1.61 km wide. This aquifer is covered by a confining unit of Quaternary clay deposit about 13.72 m thick beginning from the land surface. The difference in the hydraulic head between two observation wells 1.524 m apart is 3.05 m. The hydraulic conductivity of the aquifer is 20.44 m/d. What is the quantity of the ground water passing through a cross-section of this aquifer?
Given: velocity of flow = 0.0375 m/s coefficient =0.05 m/s porosity p =48% slope S = 3/4 Given the coefficient =0.05 m/s and porosity p =48%, find the transmissibility (T) in m/s per unit m, if the aquifer width is 1.2 m.
hydrology engineering Q.2. The formation of length 6.4km between two stream A and B IS made up of two layers, the bottom layer is previous with a thickness of 8m and hydraulic conductivity of 36m/day .the upper layer is impervious .find the discharge from stream A to stream B if the depth of water in them are 16m and 13.5m respectively .
An unconfined aquifer is known to be 32 m thick below the water table. A constant discharge of 2 cubic metres per minute is pumped out of the aquifer through a tubewell till the water level in the tubewell becomes steady. Two observation wells at distances of 15 m and 70 m from the tubewell show falls of 3 m and 0.7 m respectively from their static water levels. Find the permeability in mm/s of the aquifer. a.3.28 x 10^-1 b.4.68 x 10^-1 c.2.58 x 10^-1 d.1.18 x 10^-1
In fig 3-5, the aquifer thickness is 10 ft, the hydraulic conductivity of the aquifer is 0.06 m/day, and the river water surface is 7m above the bottom of the aquifer. If it is necessary to maintain a water level in the trench not more than 10 m deep, at what rate must water be pumped out of a 100 m long trench? The distance between the edge of the trench and the river is 300 m. Assume all water comes from the river.
Calculate the transmissivity of the confined aquifer if the flow is along the strata consist of a 3 layers. The upper layer consist of gravel of 400 cm having hydraulic conductivity of 2.0 cm/sec. The middle layer consists of the fine sand of thickness 300 cm, having hydraulic conductivity of 0.002 cm/sec. The bottom layer consists of coarse sand of thickness 400 cm, having hydraulic conductivity of 0.01 cm/sec.
1. 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 days
A tube well is constructed in a confined aquifer. The discharge of the tube well is 10 L/s, where the thickness of the aquifer is 11 meters, and the draw down is 20 meters at the tube well. The hydraulic conductivity of the permeable soil is 12 meters per day. An observation well at a radius of 500 meters has a piezometric surface of 47 meters. Calculate the diameter of the well.
A horizontal column of 100 cm length and 10 cm height is packed with a uniform soil with a saturated hydraulic conductivity of 4×10–5 cm/s. Then, the uppermost 1.0 cm is replaced with a soil with a saturated hydraulic conductivity of 2.2×10–7 cm/s. Therefore, the horizontal column has two horizontal layers. The pressure head is 20 cm at the left end (X = 0 cm; inflow boundary) of the column and 150 cm at the right end (X = 100 cm; outflow boundary). Flow is horizontal and steady state. For horizontal flow, the pressure head is the only driving force (gravitational head = 0). The volumetric water content of both soils is equal to the porosity and is 0.45 cm3/cm3. (A) Determine the effective saturated hydraulic conductivity of the layered soil column. (B) Calculate the Darcy’s flux through the layered soil column. (C) Calculate the Darcy’s flux in the top and bottom layers of the soil column.
if Manning's N=0.023 and Hydraulic radius=3 m , then value of Chezy constant is ________?
11. A channel runs almost parallel to a river as shown in the figure. The water level in the river has an elevation of 36 m. and the elevation of the channel is 33 m. The river and channel are 600 m apart and a previous formation of the average thickness of 9 m and hydraulic conductivity of 0.80 m/hr joints them together. Compute the hydraulic gradient Compute the rate of seepage flow from the river to the channel per meter width in liters per day. If the seepage velocity is 0.048 m/day, compute the void ratio of the previous medium.