1. Provide preliminary dam design. A stable gravity dam cross-section must be designed in terms of sliding and overturning given that the coefficient of sheer resistance of the foundation soil is 0.75, and the tailwater level of water converted into the channel directly behind the dam is 0.5m. Assuming an uplift force variation with no information about drainage (as a straight line from 100% of the headwater pressure at the upstream face (heel) to 100% of the tailwater pressure at the downstream face (toe) applied over 100% of the base area) and assuming usual conditions only. 1.4 Determine the moments imposed at the dam toe. 1.5 Determine the dam weight needed to achieve an overtuming factor of safety of 2. 1.6 Assuming that the dam downstream is with a slope of 1V/2H determine the dam base width to satisfy the stability requirements 1.7 At the dam bottom an emergency square gate (4mx4m) is placed to discharge water during flood events, and it is supported by a hinge at the top. What would be the force needed to open the gate?

1. Provide preliminary dam design. A stable gravity dam cross-section must be designed in terms of sliding and overturning given that the coefficient of sheer resistance of the foundation soil is 0.75, and the tailwater level of water converted into the channel directly behind the dam is 0.5m. Assuming an uplift force variation with no information about drainage (as a straight line from 100% of the headwater pressure at the upstream face (heel) to 100% of the tailwater pressure at the downstream face (toe) applied over 100% of the base area) and assuming usual conditions only. 1.4 Determine the moments imposed at the dam toe. 1.5 Determine the dam weight needed to achieve an overtuming factor of safety of 2. 1.6 Assuming that the dam downstream is with a slope of 1V/2H determine the dam base width to satisfy the stability requirements 1.7 At the dam bottom an emergency square gate (4mx4m) is placed to discharge water during flood events, and it is supported by a hinge at the top. What would be the force needed to open the gate?

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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Concept explainers

Highway Drainage

Highway drainage is the process of extracting and regulating the excess surface water on the pavement by giving the desired slope. The construction of a highway drain helps to divert the water present on the surface, and sub-grade by the means of slope. Highway drainage systems are a necessary part of smooth functioning of traffic, since the highway drainage systems provide proper disposal of unwanted substances from the highways.

Question

Scenario:
As a Hydraulic Engineer you are required to design a dam to create a reservoir in Amman City, open
channel and pumps to convey water from the reservoir to a downstream community, and a pipe
network to distribute the water within the community. Based on the hydrology assessment of the
watershed the dam height was set to 12 m above ground level, with a freeboard of 2m (water level in
the dam is 10m), dam width of 60m, and downstream flow was set at 8.5 m'/s (see Fig.1 below). Your
task as an engineer is to provide a water supply for a planned community. Your project will involve
(as a minimum):
10 m 12 m
Q-85 mys
60 m
Top view
Side view
Fig 1: Side and top of view of the proposed dam

1. Provide preliminary dam design. A stable gravity dam cross-section must be designed in terms
of sliding and overturning given that the coefficient of sheer resistance of the foundation soil is
0.75, and the tailwater level of water converted into the channel directly behind the dam is 0.5m.
Assuming an uplift force variation with no information about drainage (as a straight line from
100% of the headwater pressure at the upstream face (heel) to 100% of the tailwater pressure at
the downstream face (toe) applied over 100% of the base area) and assuming usual conditions
only.
1.4 Determine the moments imposed at the dam toe.
1.5 Determine the dam weight needed to achieve an overtuming factor of safety of 2.
1.6 Assuming that the dam downstream is with a slope of 1V/2H determine the dam base width to
satisfy the stability requirements
1.7 At the dam bottom an emergency square gate (4mx4m) is placed to discharge water during flood
events, and it is supported by a hinge at the top. What would be the force needed to open the gate?

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Step 3 Calculation of moments at dam toe

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Step 4 Calculation of required weight

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Step 5 Calculation of dam base width

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Step 6 Calculation of Force required to open the emergency gate

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