ANOTHER ROLE OF SABO DAM

Abstract

We have started observations of rainfall amount and water stages at Sabo dams in some devastated basins and a natural basin which was chosen as a basin for comparative studies. This paper points out another role of Sabo dams after describing some characteristics of runoff and sediment yield from devastated basins and a forested basin. The obtained results are as follows:
1) The ratio of runoff/rainfall during June to November of the devastated basin exceeds that of the forested basin. These phenomena may be occurred by high intensity of evapo-transpiration in the forested basin and high storage capacity of water in group of Sabo dams constructed in the devastated basin.
2) The peak specific discharge from the forested basin exceeds that of from the devastated basin for large flood. These phenomena may be also occurred by storage effect (namely, flood regulation effect) of group of Sabo dams constructed in the devastated basin.