Abstract
The relationship between rainfall and runoff has been observed over a period of 7 years on sandy loam soils of the Indian Arid Zone. Fifteen microcatchment areas (MC) were studied; these were formed by combinations of three slopes (0.5, 5 and 10%) and five lengths (5.12, 7.0, 8.5, 10.75 and 14.5 m) with corresponding areas of 252, 324, 360, 396 and 432 m 2. These MC's can produce 13.3–45.4% runoff depending upon their morphological characteristics. Over the 7-year period, threshold rainfall reduced by half and runoff efficiency doubled due to the formation of a less pervious soil crust over the MC surface; it became denser each year.
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