Introduction to WATFLOOD
Data Requirements of WATFLOOD
Compared to other hydrological modelling systems, WATFLOOD can be considered as a data intensive system. The initial development stages of the system (1972-75) coincided with the advent of remotely sensed data to provide land cover and meteorological data. It was immediately apparent that such data could enhance hydrological modelling but the models that existed at the time could not be easily adapted to take advantage of the high spatial and temporal resolution. From the onset, WATFLOOD was designed to incorporate the remotely sensed data in an efficient manner. This led to the gridded format of all data used by WATFLOOD, including discretization of the watershed itself. Thus in WATFLOOD, each "sub watershed" or element is more-or-less the same size. Exceptions occur along basin and sub- basin boundaries to ensure drainage areas at streamflow gauges are preserved. The following table presents an itemized list of the data requirement of WATFLOOD.
It is assumed that each of the data listed in Part I of the Table applies to the non-impervious land cover amounts listed in Part II. For instance, within one element, the elevation and contour density is the same for each cover. Any discrepancies are likely counter acted during the calibration process, because for instance, slope can be traded off to roughness.
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