Study on the Regional Rational Formula of the Basin of Cho-Shuei Creek

• Main Authors: Chou, Ching-Cheng, 邱慶誠
• Other Authors: Yu Pao-Shan
• Format: Others
• Language: zh-TW
• Published: 1998
• Online Access: http://ndltd.ncl.edu.tw/handle/46269425969697261391

碩士 === 國立成功大學 === 水利及海洋工程學系 === 86 === The rational formula is one of the useful tools for estimation of design peak flow in water resource engineering. Therefore, the determination of parameters in the rational formula is very important. However, the runoffcoefficient is always chosen based on the experience and judgment of engineers. The time of concentration is also a parameter to be difficultly decided,because many formulas confuse the engineers to choose a suitableone. Thosecause the difficulty of the rational formula application. Therefore, the studyaims to develop a methodology to objectively decidethe parameters, includingrunoff coefficient and time of concentration,based on the analysis of observeddata. The parameters decided at each stream flow station are further regional-ized to develop the regional rational formula for small to media upstream catchments of Cho-Shuei Creek. The regioanal rational formula proposed in thestudy not only responses thestatistical property of observed historical flood,but also can be appliedat the ungauged sites for small to median upstream basins of Cho-Shuei Creek.