Effect of watershed rehabilitation on streamflow characteristics at Sakaerat Environmental Research Station Amphoe Pak Tong Chai, Changwat Nakhon Ratchasima
1994
Somchai Onarsa
This research was conducted during June 1992 to May 1993. Four subwatersheds were selected namely, Haui Wanasart (natural dry evergreen forest), Haui Kokped (natural dry dipterocap forest), Haui Tayoo (natural succession with some forest plantation) and Haui Namkhem (forest plantation mixed natural dry evergreen forest). The potential streamflow after 10 years watershed rehabilitation of Haui Wanasart, Haui Kogped, Haui Tayoo and Haui Namkhem were measured about 23, 880, 720, 279, 800 and 108, 780 cubic m/square km or 56.5, 72.7, 73.6 and 98.9 % of the previous rehabilitation in year 1982-1983. The rainfall showed irregular distribution in this year, more amount of rainfall in dry period and less rainfall in September, as compared with the previous recorded. It was very high evapotranspiration which the soil had low moisture content and streamflow. The rainfall-streamflow relationships of all subwatersheds were non-significant in statistics except Haui Wanasart due to irregular rainfall distribution with the coarse soil texture, high soil porosity with low organic matter and shollow soil including so many crack of bedrock that the water would loss by leakage from the watershed.
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