Urbanization tends to increase runoff volumes, which might cause
flooding and reduce groundwater recharge. Since the design of
impermeable urban elements is based on the water flow volume before
their construction, once they are erected the induced change to the
local drainage pattern might generate flooding of the newly developed
and previously developed areas. As such, precise modeling is essential
to allow municipal watershed-sensitive hydrological design, which may
prevent impervious urban surface expansion negative impacts. The digital
elevation model that represents the watershed relief at any given
location is the hydrological modeling base layer, which is necessary for
describing urban landscapes and watersheds. The common notion is that
the finer the elevation model resolution is, the more precise the
hydrological model will be. Nevertheless, it is suggested that
over-accuracy might be redundant. In the same manner, the land use
classification resolution should be aligned with the modeling
requirements. Such careful evaluation of the modeling resolution will
reduce the computing resources needed for the modeling procedure and may
be utilized as a sensitivity filter for insignificant tributaries of the
hydrological network. This paper demonstrates a nominal procedure for
urban watershed sub-basin analysis, which is the initial stage for
detailed urban runoff modeling. It was found that the scale-optimized
model performed very well and was found suitable for the prediction of
runoff volume and discharge from a mainly urban, mountainous karstic
watershed.