RWH structure consists of a soil dike with dimensions; height up to 5 m, crest width up to 2 m and the length up to 60 m without any rolled. It also has a spillway. The main purpose is to retain rainfall for irrigation, and it was implemented traditionally in dry regions. These techniques are almost empty for the whole year because of the variability of rainfall (less than 250 mm).
Specify better. I did not is the stability of the structure or another type of stability?
Dear Adham.
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It seems to me you're in the presence of a traditional case of checking the stability of earth dams.
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You have to carry two separate analyzes, stability analysis to tipping and sliding solid earth, if you put a typical section (base width, steepness of slopes and maximum level of flooding), I can quickly give way to resolution.
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But the most difficult is not it, if the structure remains empty most of the time she can suffer massive land degradation, it is important to check "in place" to find out if there is no structural compromising by phenomena such as piping and other.
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In: Internal Erosion Due to Water Flow Through Earth Dams and Earth Structures (Raul Flores-Berrones and Norma Patricia Lopez-Acosta)
http://www.intechopen.com/download/get/type/pdfs/id/23121 you will have a good script to check for problems like these, and related. Good job.
Dear Adham; In our watershed earthen dikes which are kilometers together long are being used for rain water harvesting. Rainy season is for 3 months July to September and these structures hold quite a big amount of water. It is being used for irrigation during summer(rainy) season during long dry spell in lower command. Rest of the water is being released completely to a river and area which was waterlogged for 3 months used for cultivation of pulses and mustard. Bumper crop is being harvested.
Regarding stability most of the structures are stable in the watershed. Only we ave to take care of minor repairing before monsoon. Stability depends on design of structure and soil quality used along with other material. Thanks
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