Trenching technique is the use of trenches to control and drain seasonal flooded area. In Nigeria, a simple trench technique has been put in place and implemented to better drain water from seasonal flooding of lowland areas for agricultural production and fisheries. Trenches or flood control channels are series of large and empty open-air channels dug below the ground level that aids in the control of flood waters. When a flood occurs, it will occupy most parts of the floodplain. As the intensity of the water lowers, it will run into the channel and proceed to be drained into the nearby water body. The main aim of constructing the trenches is to drain out waters from the seasonal floods that almost occur annually. In some few places, the trench is used for fishing by the local fishermen to enhance their livelihoods and prolong their farming season.
The technique, conditions of implementation, benefits, sustainability and scaling up are described in a sheet you may upload HERE
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