Calculation of flood hydrographs using Landsat-derived land-use information in the Dreisam watershed,South-West Germany

Flood calculations in a watershed in South-West Germany have been carried out using a geographical data base including land-use, soil information and slope with a resolution of 64×104 m. The land-use information is result of a maximum-likelihood classification of MSS-data. As model for the calculation of the flood hydrographs the SCS-TR 20 was used. The single event calculations as well as the calculations using 24h rainfall of different return periods match the measured hydrographs well. The effect of a possible deforestation of the area due to forest damages has been simulated using 5 different scenarios. According to the simulations a total deforestation causes a 100 year peak discharge 5 times as high as with the current forest distribution.