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Maintenance of ponds - Erosion of soil in dykes and its control
Unit 5- Construction of Fish ponds
Erosion of soil in dykes and its control
The water wave developed on the top water surface due to the winds try to notch out the soil from the upstream face and may even some times cause the slip of the upstream slope. Upstream stone pitching be provided to avoid such failures. Heavy rains falling directly over the down stream face and the erosive action of the moving water may lead to the formation of gullies on the down stream face, ultimately leading to the dam failure. This can be avoided by proper maintenance, filling the cuts from time to time especially during rainy season. Grassing the slopes and by providing proper berms at suitable height,so that the water has not to flow for considerable distance. The proper drainage arrangements are made for the removal of the rain water collected on the horizontal berms. Since the provision of berms ensures the collection and removal of water before it acquires high down ward velocities, the consequent erosion caused by the moving water is considerably reduced.
The water wave developed on the top water surface due to the winds try to notch out the soil from the upstream face and may even some times cause the slip of the upstream slope. Upstream stone pitching be provided to avoid such failures. Heavy rains falling directly over the down stream face and the erosive action of the moving water may lead to the formation of gullies on the down stream face, ultimately leading to the dam failure. This can be avoided by proper maintenance, filling the cuts from time to time especially during rainy season. Grassing the slopes and by providing proper berms at suitable height,so that the water has not to flow for considerable distance. The proper drainage arrangements are made for the removal of the rain water collected on the horizontal berms. Since the provision of berms ensures the collection and removal of water before it acquires high down ward velocities, the consequent erosion caused by the moving water is considerably reduced.
Last modified: Tuesday, 26 April 2011, 4:53 AM