Using a seasonal water yield model to assess the impact on runoff volume, the case of agriculture in the Bang Kloy Bon sub-watershed, Kaeng Krachan National Park , Thailand
Thammanoon Temchai/ Email: dhamma57@gmail.com
National Parks Research Center (Petchburi)
National Parks Office, Department of National Parks, Wildlife and Plant Conservation, THAILAND
ABSTRACT
The objective of this study was to compare runoff volumes in the Bang Kloy Bon sub-watershed under different management scenarios; In case of no agriculture area and in the case of agriculture in the sub-watershed as desired using comparative criteria from imaginary forest conditions that have not been disturbed by humans. The seasonal water yield model of the InVEST (Integrated Valuation of Ecosystem Services and Tradeoffs) tool was used. The results of the study indicated that if the watershed area is converted to agricultural area will cause the water balance in the stream to change. As a result, the amount of water runoff at the top of the soil increased until the flooding occurred. The water retention in the soil is reduced, and during the period the water flow in streams will be broken in the dry season. Affects communities located in the Phetchaburi River area, the area above the Kaeng Krachan Dam and the lower part down and can affect communities in Muang district Phetchaburi Province, Including the risk of drought problems in some seasons in the future, accounted for the loss value (excluding other property damage) 391.11 million baht per year