Catchment of the Mielnica Stream is situated in Trzebnica Hills area, covered with loess soils and under an intensive agricultural use. Bathometrical and hydrometrical measurements were taken in the hydrological years 1982/83-1993/94. Daily and periodical masses of a suspended load carried out through the hydrometrical cross-section, flow and unit run-off rates were analysed. The weight of total measured annual sediment ranged from 2.56 Mg to 295.94 Mg. Value of the mean annual flow rate, at the catchment closing cross-section, ranged from 8 to 19 l s^–1·and the maximum daily values from 18 to 434 l s^–1. Additional analyses of water chemical composition were made in the years 1988-1990. Sixteen different chemical compounds and elements were investigated. Calculated chemical denudation indices were determined by the hydrometeorological conditions.