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(i) Gradient of the land: The slope should be steep to allow flow of water by gravity.
(ii) Vegetation: Absence of vegetation will increase the rate of run-off.
(iii) Human activity: Construction of roads in built up areas prevent infiltration and arouse surface run-off.
(iv) Amount of water: There should be sufficient rainfall to make the soil saturated in order to allow the excess water to form surface run-off.
(v) Nature of soils or rocks: The rocks/soil should be impermeable to allow for limited infiltration and percolation for the excess water to form surface run-off.
(vi) Water table: The water table should be high to reduce infiltration and allow surface run-off.
maurice.mutuku answered the question on June 7, 2017 at 06:13
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