Given the importance of these models in hydrologic engineering practice, more research is needed to clarify the issues raised in this article. Much higher than expected assuming uniform abstraction. SWMM and HEC-HMS behaved more or less properly for the impervious cases (a and c), with some imperfections.įor case b, due to the initial abstraction assumed, SWMM and HEC-HMS showed a peak flow Results for peak flow, timing of the peak, and mass conservation were as expected. ONLINEOVERLAND behaved properly for the three cases. The results were analyzed for (1) peak flow, (2) timing of the peak, and (3) mass conservation. (c) Modified impervious case, with CN = 100, and P = 17.7666 cm. (b) Pervious case, with CN = 80, P = 24 cm and, consequently,Įffective precipitation P e = 17.7666 cm (a) Impervious case, with curve number CN = 100, and total precipitation P = P e = 24 cm Three overland models, ONLINEOVERLAND, SWMM, and HEC-HMS were tested under three cases:
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