In a drainage system, closed drains are placed with their centres 1.8 m below the ground level. The highest position of the drained water table is 1.4 m below the ground level. The impervious layer is at a depth of 5.8 m below the ground level. The average annual rainfall is 75 cm and permeability is 2 x 105 m/sec. If it is assumed that 1% of annual average rainfall is drained per day, then the spacing of drains is

In a drainage system, closed drains are placed with their centres 1.8 m below the ground level. The highest position of the drained water table is 1.4 m below the ground level. The impervious layer is at a depth of 5.8 m below the ground level. The average annual rainfall is 75 cm and permeability is 2 x 105 m/sec. If it is assumed that 1% of annual average rainfall is drained per day, then the spacing of drains is

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

A canal and a stream run parallel to each other at a separation distance of 500m. both of them completely penetrate an unconfined aquifer (K= 3m/day) located above a horizontal impervious bed. The aquifer forms the separation land and mass between the two water bodies. The water surface elevations in the canal and the stream are 5m and 15m, the datum being horizontal. Estimate the following: The seepage discharge in the canal, in cubic meters per day The seepage discharge in the stream, in cubic meters per day
A canal and a stream run parallel to each other at a separation distance of 400 m. Both of them completely penetrate an unconfined aquifer (K = 3.0 m/day) located above a horizontal impervious bed. The aquifer forms the separation landmass between the two water bodies. The water surface elevations in the canal and the stream are 5.0 and 3.0. Find the the seepage discharge into the two water bodies Plot the water table.
A Channel runs along almost parallel to a river ,and they are 2000 ft apart. The water level in the river is at elevation of 120 ft .The channel is at elevation of 110 ft. A pervious formation averaging 30 ft. thick and with hydraulic conductivity of 0.25 ft/hr joins them. Determine the flow rate of seepage from the river in cu ft per day Hint :consider 1 ft length of the river and channel
In a subsurface pipe drainage system, it is desired to keep the highest level of the water table at 1.5 m below the ground surface. The depth of impervious layer from land surface is 10.0 m and the depth of the drain below the land surface is 2.0 m. The mean annual rainfall in the area is 96 cm; and the coefficient of permeability is 6 × 10-6 m/s. Design the spacing the drain pipes. Highest 1.5 m 2 m WT b=10-1.5 10 m K-S=7- =8.5 m CSScannewith
Water table in a canal command receives a recharge at the rate 2.5 mm/day. Sub-surface ditch drains at a spacing of 2 km are provided for the sub-surface drainage. Estimate the maximum rise of the water table at steady state. Given: hydraulic conductivity of the soil = 10 m/day, depth of the impervious layer below initial water table position = 20 m. Assume the ditches to be fully penetrating.
A soil of two layers has a hydraulic conductivity of 8(cm/day) for the first layer, and 2.5(m/day) for the second layer. There is a boundary level which separate the two layers and the location of the boundary is after the first layer. The drain is installed on the second layer at a distance of 2.8 m from the impervious layer. The total depth of the second layer is 4m. The depth of water table from drain level is 2m, the recharge is 2(cm/day), and drain wetted parameter 1.5m. Find drain spacing using simplified Hooghoudt -Ernst Equation.
A canal and a stream run parallel to each other at a separation distance of 400 m. Both of them completely penetrate an unconfined aquifer (K = 3.0 m/day) located above a horizontal impervious bed. The aquifer forms the separation landmass between the two water bodies. The water surface elevations in the canal and the stream are 5.0 and 3.0. Plot the water table.
A homogeneous earth dam has a top width of 6 m and a height of 42 m with side slopes of 3 to 1 and 4 to 1 on the upstream side and downstream side respectively. The free board is 2 m. There is a horizontal filter at the base on the downstream side extending for a length of 60 m from the toe. If the coefficient of permeability of the soil is 9 × 10^–2 mm/s, find the quantity of seepage per day for 100 m length of the dam in l/s.
A homogeneous earth dam has a top width of 6 m and a height of 42 m with side slopes of 3 to 1 and 4 to 1 on the upstream side and downstream side respectively. The free board is 2 m. There is a horizontal filter at the base on the downstream side extending for a length of 60 m from the toe. If the coefficient of permeability of the soil is 9 × 10^–2 mm/s, find the quantity of seepage per day for 100 m length of the dam. a. 75 l/s b. 45 l/s c. 60 l/s d. 90 l/s
Q6/a: A soil of two layers has a hydraulic conductivity of 8(cm/day) for the first layer, and 2.5(m/day) for the second layer. There is a boundary level which separate the two layers and the location of the boundary is after the first layer. The drain is installed on the second layer at a distance of 3.2 m from the impervious layer. The total depth of the second layer is 5m. The depth of water table from drain level is 2.5m, the recharge is 2.7(cm/day), and drain wetted parameter 0.3m. Find drain spacing using simplified Hooghoudt - Ernst Equation. 85.13 m O90.13 m O 105.13 m none of these
A canal and a stream run parallel to each other at a separation distance of 500m. both of them completely penetrate an unconfined aquifer (K= 3m/day) located above a horizontal impervious bed. The aquifer forms the separation land and mass between the two water bodies. The water surface elevations in the canal and the stream are 5m and 15m, the datum being horizontal. Estimate the following: The infiltration rate, in cm per year, that will create a water table divide at a distance of 200m from the canal, The elevation of the water table divide, in meters
b. Determine the spacing of pipe drain from following data. Annual rainfall = 1000mm Drainage coefficient = 1% to be drained in 24 hrs Depth of impervious layer from land surface = 10m Depth of highest position of water table below the land surface = 1.5m Depth of drain below land surface = 2.0m Permeability of soil = 10-4 m/s