Sridhar, Venkataramana Rao creator Tawatchai Tingsanchali Chairperson Nophadol In-na Co-Chairperson Sheng, Liang Examination Committee The Netherlands Scholarship Donor text series technical report th Bangkok Asian Institute of Technology 1994 continuing eng 173 leaves The current practice of PMF Estimation in the storm rainfall prone Ubol Ratana Reservoir is by Rational formula and Unit Hydrograph approach. The storm rainfall and their distribution is not given due attention during the previous studies even though the acceptable conservative values of PMF obtained from them. In this study, a reliable and authenticated method of estimating PMF is proposed for the reservoirs in the Northeast Thailand based on the: 1. Careful consideration of storms that cross the catchment area along with orientation and their period of crossing which is capable of producing a rainfall exceeding 150 mm. As the emphasis is mainly for the extreme cases of occurrence of storm, a long spell of 50 years of observation is considered in this study. 2. Basin Averaged Probable Maximum Storm Rainfall depths computation using modified Hydrometeorological Report No.52 (HMR52 Program). The original program suitable for United States has been modified and made user interactive, thus enabling the program to be applicable to Thailand. 3. Transformation of rainfall into runoff using a rainfall runoff model SSARR after calibrating the model with recent catchment characteristics changes incorporated in it. Thus, a Rational Procedure for PMF Estimation to a reservoir is proposed using modified HMR52 and SSARR models. Furthermore, the important parameter, Precipitation Weighting Factor in the rainfall-runoff model is standardized carefully to compute the inflow at the reservoir location. Thus a more reliable and conservative PMF is obtained in this study. Furthermore, the observable difference in PMF estimation can be taken as an implication of consideration of extreme conditions as well change in the catchment area characteristics. A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering. School of Civil Engineering Thesis (M. Eng.) - Asian Institute of Technology, 1994 Ubolratana Reservoir Flood forecasting Thailand Ubolratana Reservoir Asian Institute of Technology. http://203.159.5.9/ait-thesis/detail.php?q=B16067 http://203.159.5.9/ait-thesis/detail.php?q=B16067 951012 20260818112528.0