RAINFALL-RUNOFF CONDITIONS OF THE FRYSAVKA RIVER BASIN

Current hydrological models provide design parameters for the design of flood control measures. Runoff from the river basin is primarily determined by the amount of rainfall and water retention of the river basin. The first step leading to the design of flood measures is to identify the parts of the basin with increased production of runoff surface. Flow conditions were modeled in the river basin of Frysavka. The actual calculation of the volume of direct runoff from sub-basins. Before the actual calculation of the volume of direct runoff from subbasins was carried out: description of the current state of land cover based on a detailed field survey, the representation of hydrological soil groups in the basin found in BPEJ (Bonitovane pudne ekologicke jednotky - Valuated land-ecological units) maps, delimitation of basin parts by the digital vector layer ZABAGED altimetry (Zakladni baze geografickych dat - Fundamental base of geographic data) - 3D contour and evaluation of basin parts by the runoff curve numbers (CN). The processing of background data was performed by the program ArcGIS 9.2 of ArcView software products using a set of integrated software applications ArcMap, ArcCatalog and ArcToolbox. To assess the volume of direct runoff, as part of the hydrologic characteristics of the Frysavka River basin, was used the curve number method at a modification of the deterministic episode model DesQ-MAXQ. Based on the calculated values of direct runoff volumes were in each sub-basin found the rates of intercepted water from the draft rainfall with a recurrence of 100 years. The volumes of direct runoff and the rate of intercepted water in the sub-basins are presented in the form of map outputs.