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[4]: 144 Drainage, frost penetration and external loads such as wind and hydrostatic forces also have to be determined and included in the final examination of the design. [4]: 144 Soil nail walls are not ideal in locations with highly plastic clay soils. Soils with high plasticity, a high liquid limit and low undrained shear strengths are at ...
Drainage front instability, also known as viscous fingering, where an unstable drainage front results in a pattern of fingers and viscous entrapped saturated zones. Irrigation with saline or high-sodium water may damage soil structure owing to the formation of alkaline soil. Clogging of filters: algae can clog filters, drip installations, and ...
The checked surface drainage systems consist of check gates placed in the embankments surrounding flat basins, such as those used for rice fields in flat lands. These fields are usually submerged and only need to be drained on certain occasions (e.g., at harvest time). Checked surface drainage systems are also found in terraced lands used for ...
Even in the computer era, manual watershed delineation is still a useful skill, in order to check whether watersheds generated with software are correct. [ 1 ] Instructions for manual watershed delineation can be found in some textbooks in geography or environmental management, in government pamphlets, [ 4 ] [ 5 ] or in online video tutorials.
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Point drainage, which intercepts water at gullies (points). Gullies connect to drainage pipes beneath the ground surface, so deep excavation is required to facilitate this system. Support for deep trenches is required in the shape of planking, strutting or shoring. Channel drainage, which intercepts water along the entire run of the channel.