雨水下水道之設計，每一涵管各有其集水區，但都市地區地勢平坦，豪雨期間可因積水而溢越其集水分區。因此，雨水下水道系統演算模式應能與地面之降雨-逕流模式整合，分析雨水下水道輸水能力，並發揮即時淹水預報之功能。
豪雨期間之雨水下水道流況為緩變量流，因此本研究應用擬似定量流理論建立「緩坡雨水下水道系統模擬模式」，可演算豪雨發生時緩坡雨水下水道系統人孔未溢流之水位變化。本模式中之雨水下水道流量律為依據明渠定量緩變速流及管流理論推導之緩坡雨水下水道流量公式，並發展由兩端人孔水位以雨水下水道流量律計算流量之數值解法。
本研究以所建立之「緩坡雨水下水道系統水流模式」分析設計案例中雨水下水道排入滯洪池及排入自然水域之排水過程。配合應用地文性排水-淹水模式演算颱風期間人孔水位，本研究並探討人孔豎井尺寸及降雨損失對於演算結果之影響。
由模擬演算結果可看出以滯洪池水位歷線作為下游邊界條件並以S.C.S.法考慮降雨損失後，所演算之人孔水位歷線與觀測值趨勢一致，且人孔尺寸對模擬之結果影響頗為微小。
本研究所建立之「緩坡雨水下水道系統模擬模式」與地文性排水淹水模式整合將可應用於分析雨水下水道系統之輸水能力，進而預報豪雨期間雨水下水道系統之人孔水位及溢流現象。

The storm sewer design, each sewer have their own water catchment area of culvert, but the urban areas is flat, heavy rain during the stagnant water and may be due to the overflow of its catchment area. Therefore, the storm sewer systems model should be able to calculate with the rain - runoff model to analyze the delivery capacity of the storm sewer systems, and play an immediate flood forecasting function.
The flow of storm sewers during heavy rain is gradually varied flow. In this study, applying the quasi-steady flow theory to generate "Storm Sewer Systems with Mild Slope Simulation Model" and simulate the water level changes of nonsurcharged manholes during heavy rains. The discharge law of storm sewers in this study is base on the quasi-steady openchannel flow and the pipe flow theory, developing the numerical method to calculate the discharge in sewers by water levels in manholes at each ends.
In this study, analyzed the drainage process of the flood discharged to detention basins and nature water by the established model, and simulated the water level of manholes during Typhoon with PHD-model, and investigated the effect on the manhole size and consider rainfall loss.
The water level hydrograph of detention basins took as boundary conditions and considered the rainfall loss by S.C.S. method, the simulation results conformed to the observations, and the effect of the different manholes size on simulation results was slight.
In summary, the model with PHD-model can apply to estimate functions of storm sewer systems, further forecast the water level of manholes during heavy rains and the surcharged phenomenon.

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