Influences of Rainfall and Antecedent Precipitation Index on Surface Runoff Generation in Na Luang Sub-Watershed, Nan Province
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Abstract
Rainfall and antecedent precipitation index (API) can be used as indicators or criteria for surface runoff. This study found that the average annual rainfall (2018-2019) was 989.40 mm. When daily antecedent precipitation index (APIt) was greater than the critical antecedent precipitation index calculated by saturated soil moisture (CAPIsat), it was indicated that there were surface runoff events in the natural forests and agricultural watersheds as 16 and 71 times, respectively. The averages of surface runoff were approximately 20.39 and 37.10 mm per time, respectively. The 9-day accumulated rainfall levels were greater or equal to 87.39 and 49.54 mm, respectively. Moreover, the daily antecedent precipitation indexes were 211.44 and 200.02 mm, respectively. The natural forest watersheds occurred surface runoff less than agricultural watersheds as 81.89 percent.
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บทความที่ได้รับการตีพิมพ์เป็นลิขสิทธิ์ของคณะวิทยาศาสตร์และเทคโนโลยี มหาวิทยาลัยธรรมศาสตร์ ข้อความที่ปรากฏในแต่ละเรื่องของวารสารเล่มนี้เป็นเพียงความเห็นส่วนตัวของผู้เขียน ไม่มีความเกี่ยวข้องกับคณะวิทยาศาสตร์และเทคโนโลยี หรือคณาจารย์ท่านอื่นในมหาวิทยาลัยธรรมศาสตร์ ผู้เขียนต้องยืนยันว่าความรับผิดชอบต่อทุกข้อความที่นำเสนอไว้ในบทความของตน หากมีข้อผิดพลาดหรือความไม่ถูกต้องใด ๆ
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