Q19) In a drainage system of (0.2m indiameter), the depth of pipe drain is1.5m below the ground surface; thedrain is over on impervious layerabout 9.0m, and the average annualrainfall in the area is 850 mm, andoccurs between October and April. Ifthe maximum permissible depth ofgroundwater table (WT) to be kept of1.0m below the ground surface bydraining 25% of annual rainfall by 24hours. In addition to the excess waterfrom irrigation requirements of20mm/day that should also bedrained. Determine the spacingbetween drains. The coefficient ofpermeability maybe taken as 0.0012* .cm/secUse L=20.0 mUse L=60.0 mUse L=80.0 m OUse L=75.0 m O

Given : Average annual rainfall = 850 mm Dia of drain = 0.2 m Depth of groundwater table = 1 m below…

Q19) In a drainage system of (0.2m in diameter), the depth of pipe drain is 1.5m below the ground surface; the drain is over on impervious layer about 9.0m, and the average annual rainfall in the area is 850 mm, and occurs between October and April. If the maximum permissible depth of groundwater table (WT) to be kept of 1.Om below the ground surface by draining 25% of annual rainfall by 24 hours. In addition to the excess water from irrigation requirements of 20mm/day that should also be drained. Determine the spacing between drains. The coefficient of permeability maybe taken as 0.0012 * .cm/sec Use L=20.0 m O Use L=60.0 m Use L=80.0 m Use L=75.0 m

Q19) In a drainage system of (0.2m in diameter), the depth of pipe drain is 1.5m below the ground surface; the drain is over on impervious layer about 9.0m, and the average annual rainfall in the area is 850 mm, and occurs between October and April. If the maximum permissible depth of groundwater table (WT) to be kept of 1.Om below the ground surface by draining 25% of annual rainfall by 24 hours. In addition to the excess water from irrigation requirements of 20mm/day that should also be drained. Determine the spacing between drains. The coefficient of permeability maybe taken as 0.0012 * .cm/sec Use L=20.0 m O Use L=60.0 m Use L=80.0 m Use L=75.0 m

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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A pump can lift water at a discharge of 0.15 m³/s to a head of 25 m. The critical cavitation number (o) for the pump is found to be 0.144. The pump is to be installed at a location where the barometric pressure is 9.8 m of water and the vapour pressure of water is 0.30 m of water. The intake pipe friction loss is 0.40 m. Using the minimum value of NPSH (Net Positive Suction Head), the maximum allowable elevation above the sump water surface at which the pump can be located is
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Problem 1. Consider a drainage system that consists of horizontal drains located at an elevation ho above the base of an unconfined aquifer of thickness b 10 m (see Figure 1). The recharge rate is r = 100 mm/yr, and the hydraulic conductivity of the aquifer is K = 1 m/d. The design condition of the drainage system is to avoid ponding at the ground surface. You can ignore the vadose zone for this problem. 1. Obtain the relation between the half-distance between drains, L, and the elevation of the drains, ho. Plot this function over the range of feasible lengths. 2. The cost of each individual drain can be split as the cost of the material (fixed) and the cost of installation (which is assumed to be proportional to the depth b – ho). If the fixed cost is $500 and the installation cost is $100 per meter of aquifer length per meter of depth, can you build a drainage system for less than $1 per meter of aquifer length? If so, what depth ho and spacing 2L would you choose? K= 1 m/day 2L = r…
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Exercise [1] For a small drainage area, the infiltration rate at the start of rainfall storm was record to be 90 mm/hr and decreased exponentially to a constant rate of 8 mm/hr after 2.5 hr. The total infiltration during 2.5 hr was 50 mm. Develop the Horton's equation for the infiltration rate at any time t < 2.5 hr.
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