因計算效率高、分析架構具彈性，且可依據需求優先順序分配用水等特點，最小成本網流規劃法適用於分析複雜水資源系統的用水規劃與管理。然而成功應用網流模式的關鍵之一在於合宜設定網流命題中的箭線成本，以正確反應水權、用水協議、水庫運用規線、多水庫聯合運用等水量分配決策之設施操作規則或水量運用原則。本研究提出一種客觀決定網流中各條箭線成本的分析法，以確保利用網流模式模擬廣域水資源運用可獲致符合水量分配決策之成果。
　　此分析法彙整廣域水資源系統中常見的數項基本水源運用規則：(1)水權優先順序，(2)系統內上、下游兩點間不同路徑之導水優先順序，(3)單一水庫運用系統之供、蓄水相對優先順序，(4)多水庫系統聯合供應共同供水區之規則與蓄水分配原則，(5)越域引水管路僅能引取設置前原系統的剩餘流量，以及(6)其他水量分配協議等運用情境。依循此諸規則設定水資源網流系統內的水量分配順序後，運用路徑搜尋演算法將各路徑水流之相對優先順序轉換為路徑上各箭線成本組成的不等式，再運用線性規劃求解各箭線的適切成本。依據此組最適成本模擬水源運用，即可正確分配複雜廣域系統的水資源，由於直接設定箭線最適成本免除試誤過程，可顯著提高運用網流模式分配複雜系統水資源之效率。

Network flow programming (NFP) has been widely utilized in simulating water allocation process because of its computational efficiency and structural flexibility. One of the key issues while using such a model is to mimic the complexity of water allocation rules by properly assigning a set of cost coefficients to every arc in the water supply network.
According to the concept of Israel and Lund (1999), this study proposed an analyzing procedure to determine the cost coefficients of a pure NFP-based simulation model to preserve the water allocation priority. Representative rules, such as reservoir operating rule curves, water convey preference, multi-reservoir storage allocations and surplus water trans-basin diversion, were all included in this procedure. Water allocation requirements of the analyzing system should be first specified by these rules. The allocation requirements are then converted into linear inequalities composed of arc cost coefficients through path enumeration analysis. These linear inequalities coupled with an objective function are then solved by linear programming package and a set of cost coefficients feasible to the priority constraints can be obtained.
This procedure can facilitate as a preprocessor of the NFP-based simulation model. It helps to elevate the efficiency and effectiveness in simulating regional water allocation with complex operating rules and multiple reservoirs, demands and water supply routes. It can also aid engineers or model beginners in properly applying NFP model to simulate water allocation process.

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