本研究以嘉南農田水利會新化灌區為例，探討如何更新改善系統蓄水及調節能力，以有效運用灌區內水庫埤池水源，提升地區水資源利用率，並研議最佳方案組合的改善策略。本研究同時運用模擬法與優選法，評估離散與非離散的組合策略，運用水資源通用模擬模式WRASIM模擬新化灌區水庫埤池的水源運用，另利用BOBYQA非線性規劃法優選最小成本改善策略，據以研議可增加灌溉水量的最佳方案。
　本研究先針對離散的改善策略建置組合策略，再對各離散策略組合，在一定缺水限制下，優選各水庫埤池的清淤量，以最小的總開發成本研議整體最佳改善策略。對不同的缺水情況建立增供水量與投資經費的關係曲線，供在有限經費下選擇最佳的改善措施組合方案，得以最小成本提升灌區可供水量。最佳策略顯示，欲使新化灌區整體年平均缺水率下降至11%以下，最小成本的離散組合策略為活化烏瓦窯埤並設抽水機，以增加水源供灌大洋小組第1、3輪區及崁頂小組第1、2、3輪區，另用抽水機加壓將虎頭埤第一幹線水源送至南幹支線暗管以供灌大埤小組。

This paper discussed how to increase the system water storage and improve the regulation ability to effectively utilize the water resources of the reservoirs and ponds in an irrigation district. It raised the utilization rate of the water resources in the area and developed the best combination of the improving strategies. In this study, both of the simulation and optimization analysis were applied to evaluate efficacy of the discrete and non-discrete improvement strategies. A generalized water resources simulation model, WRASIM, is used to simulate the water supply of the reservoirs in the irrigation district. The nonlinear programming method BOBYQA is used to optimize the minimum cost improvement strategy to increase irrigation water.

This study first constructed a combination strategy of the discrete improvement strategies, and then, under the specific annual average water deficit, the amount of the dredging of the reservoirs is optimized. The overall improvement strategy is developed with the minimum total development cost. The relationship between the increase in water supply and investment cost for different water shortages, for the best alternative under the limited budgets to improve the combination of alternatives to minimize the cost of irrigation water. The best strategy shows that for the annual average water deficit for the Hsinwha irrigation district is less than 11%, the minimum cost of the discrete combination strategy is to activate the Wuwayao Pond and install a new pump to increase the water supply to the 1st and 3rd rotation zone of Dayang set and the whole Kanding set. The other strategy is to apply pump to deliver water to the pipeline of the south branch of the Chianan ditch to irrigate Dapi set.

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