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Hydraulic Structures Addis Ababa University Study Guide Design Example Gravity dam Design the non- overflow section of a gravity dam with the following data for an extreme loading condition: I. R. L. of deepest foundation level 100 m II. R. L. of roadway at the top of dam 161 m III. Full reservoir level 152 m IV. Design flood level 155 m V. Maximum tail water level 106.9 m VI. Minimum tail water level 100 m VII. Maximum deposited silt level on the upstream 105.3 m. VIII. Location of centre of drainage gallery form u/s face of dam 7 m IX. Roadway width at the top 6.1 m X. Downstream vertical face up to El. 154.28 m XI. Upstream face of dam vertical XII. Downstream face of dam 0.9 horizontal to 1.0 vertical XIII. Dry density of silt 1360 kg/m3 XIV. Unit weight of concrete 25 KN/m3 XV. Safe bearing capacity 1672 KN/m2 XVI. Shearing resistance of concrete (average) 2060 KN/m2 XVII. Shearing resistance of foundation (average) 1300 KN/m2 XVIII. Minimum allowable shear friction factor under a. Normal loading = 5.0 b. Extreme loading = 4.0 XIX. Maximum coefficient of sliding under Normal loading = 0.75 XX. Horizontal seismic coefficient = 0.2 XXI. Vertical seismic coefficient = 0.1 XXII. Fetch distance 18 km XXIII. Average wind speed 25 m/s Design 6.1 161 154.28 152 0.9 W1 1 W2 105.3 106.9 100 7 A. Selection of Dam Profile The base width as provided for the given section: B B = 0.9*(54.28) + 6.1 = 54.95 m The angle of the downstream face from the vertical is: tan-1(0.9/ ...
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