I want to run a Runoff simulation model (MIKESHE by DHI) and i do not know what parameters to use in some areas . One of those areas is the overland flow zones.It requires a Shape file with some Zones (polygons from slope or polygons made by reclassifying elevation (DEM) to lets say lowland(0-200 m) or mountainous (600m-above) can be used.)and then it requires some values for each polygon like slope slope length and Manning"s number. Any ideas lets say on what kind of manning number i could use for those zones? in detail i can have the slope the elevation some land cover , geology ects. Could someone recommend some bibliography . Also i do not know how to calculate the slope length ,i could use the length of the contours that are used to give an average slope but i merged those with 20 meters contour interval with those with 100 m contour interval and i cant do that . maybe i could find the contours of 100 m interval and do it but any other ideas ?

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