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This paper presents a simple system of quantitative descriptions of drainage processes on irregular surfaces ofroad segments based on computer simulation techniques, and it proposes an alternative flow model which more closely takes into account linked geomerphic and hydrologic properties, In earlier papers, the author formulated such a rnedel in the ene-dimensienal manner. The approach employed here is extension of this model into two dimensions. The model derived here represents the mode of accumulation ofwater in depressions on the irregular surface and the development ef oversurface fiow. The surface flow system is simulated by a simple storage model, The assumptions behind a model postulated as describing the model ef accumulation of water en irreguiar surfaces are that the infiltration capacity of soil is exceeded and the rainfa11 centinues. Accordingly, the residuaL water ration (the deprcssion-storage of irrcgular surfaces) can be deriyed in a simple way. In order to verify the applicability of these models for practical purpose, several types ofroad surface consolidated by different combinations of operations and machinery were analyzed. Kql;werds: forest road' frrqgttJar sudece; Drainage process; Shrnyface ,flow; Computer simulation,' Residual water ratio; Cbnsoliclation

journal of rainwater catchment systems

Quantitative Descriptions of Drainage Processes on Irregular Surface of Road Segments Based on Advanced Computer Simulation Techniques (II) : Simulation Model for Description of Drainage Process on Irregular Road Surface