[Floods related to the damage of Batanghari watershed Jambi (Indonesia)]
1993
Ilyas, M.A. | Effendy, R. (Pusat Penelitian dan Pengembangan Pengairan, Bandung (Indonesia))
To the present, hydrologist as well as weather forecasters have not been able to forecast when storms or floods will occur, although actual frequency and intensity of floods as well as storms can be calculated after a flood has been viewed. In the case of rainfall of similar intensity and duration in catchment areas of same extent, flood will show a different peak or volume because the discharge hydrograph depends also on the type of soil and vegetation in the area. General condition shows that the thicker vegetation and the more porous the type of soil, the lesser the flood peak. For catchment areas where input from rainfall and output from discharge are measured, application of the USA Soil Conservation Service can estimate the amount of water storage by S and indicate the run-off parameter index known as the Curve Number (CN). CN can reach a maximum index of 100 when S= 0, meaning that no rainfall has been stored either by soil or interception of vegetation roots, on the other hand the smaller the CN the greater the amount of water stored by S which indicates the condition of the catchment area. Theoretically the S value will depend on the maximum soil moisture. This paper discusses the application of the SCS method for an analysis of the flood in 1992 and the recorded water level data in the Sub-river basin of the Batang Hari namely Batang Hari-Muara Kilis and Batang Merangin-Bangko. The obtained CN value will determine the priority of river management for the sub river basins of the Batang Hari
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