Effect of different vertical intervals of broad base terrace on the amount and composition of runoff and sediment load [study conducted in the Philippines]
1982
Satorre, C.E.
The amount and composition of runoff and sediment load as affected by the different vertical intervals of a broad base terrace was undertaken on a 7 percent slope of clayey, halloysitic, isohyperthermic, typicpaleudult at the Bago Oshiro Research Station, Davao City. The vertical spacings used were: S/2 + 0 (bare); S/2 + 0 (with corn crop); S/2 + 2 (with corn crop); S/2 + 3 (with corn crop); and S/2 + 4 (with corn crop). Results showed that surface runoff and sediment load per unit area from plots of V.I. = S/2 + 4 with an average runoff and soil loss of 7.9 li/m2 and 10.2 g/m2, respectively, were found to be lower than plots with vertical spacings of S/2 + 0 (bare) with runoff and soil loss of 16.7 li/m2 and 22.4 g/m2; S/2 + 0 (with corn crop), 14.1 li/m2 and 20.32 g/m2; S/2 + 2 (with corn crop), 10.8 li/m2 and 16.4 g/m2; and S/2 + 3 (with corn crop) 10.1 li/m2 and 12.0 g/m2, respectively. The result of the experiment showed that plots of V.I. = S/2 + 4 gave the minimum soil loss and runoff per unit area. This may indicate that this vertical spacing is still allowable in the locality at a given soil type (Tugbok clay) and a slope of 7 percent. Furthermore, the result revealed that boil soil loss and runoff are expected to be lower at vertical spacing greater than S/2 + 4 with soil under good cover condition
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