In geotechnical engineering, an interceptor ditch is a small ditch or channel constructed to intercept and drain water to an area where it can be safely discharged. These are used for excavation purposes of limited depth made in a coarse-grained soils. These are constructed around an area to be dewatered. Sump pits are also placed at suitable intervals for installation of centrifugal pumps to remove the water collected in an efficient manner. In fine sands and silts, there may be sloughing, erosion or quick conditions. For such type of soils the method is confined to a depth of 1 to 2 m. Interceptor ditches are most economical for carrying away water which emerge on the slopes and near the bottom of the foundation pit. Its size depends on the original ground slope, runoff area, type of soi
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