The Different of Hydrological Services from Forest Development Activities at Huai Hong Khrai Watershed, Chiang Mai Province

Abstract

Hydrological services of watershed ecosystem are the one index which could be indicated effects of forest restoration in different activities from the past to present. This research aimed to clarify and compare the hydrological services of watershed ecosystem from different forest development activities of Huai Hong Khrai Watershed, Chiang Mai province. Four different development activity sites were selected; 1) rainwater forest development, 2) check dam forest development, 3) irrigation forest development and 4) reservoir and check dam forest development. The analysis indices of average runoff, flow date and flow interval were analyzed during 2011-2017. The result showed that average annual runoff and wet-dry period runoff were non-significant (p<0.05). These indices were highest at rainwater forest development site, however, during the dry period the runoff at reservoir and check dam forest development site had highest amount. Flow date at 25%, 50%, 75% were found in wet period, while, flow date at 95% and 99% were found in dry period. In addition, the highest value was found at reservoir and check dam forest development site. Indicating the reservoir and check dam forest development activity site had spent long time for runoff acumination. In accordance with flow interval had the short period of last 5 % and 1 % runoff during lack of rainfall. Indicating that the reservoir and check dam forest development activity is good hydrological services. The results of this study can be used as a guideline for selecting forest restoration activities that require hydrological services as a key index. It can be a database for water resource management for solving flood in rainy season and lack of water in dry season problems.

Keywords: hydrological services; forest restoration

---