Load of heavy metals in drainage waters in the Middle Sudety Mountains.Research were carried out in study site located in Stare Bogaczowice near Wałbrzych. The daily drainage runoff measurements and periodical chemical analyses of water samples from selected drainage plots had been made. Concentrations of heavy metals: Cu, Zn, Zn, Pb, Cr i Cd had been measured. Drainage waters do not include signifi cant amounts of heavy metals. Concentration of zinc, which is very common in nature, ranged from 0.018 to 0.675 mg Zn·dm -3 , cadmium concentrations was somewhat larger then 0.001 mg Cd · dm -3 . In spite of precipitations higher then in the other sites and because of low concentrations, the heavy metal loads had been very small. Regarding lead and nickel load did not exceed 70 g·ha -1 ·yr -1 , and concerning copper, chromium and cadmium it was below 5.0 g·ha -1 · ·yr -1 . Heavy metals in drainage waters do not make serious threat on surface water body receivers.

Changes in the reserves of soil retention of arable lands in Central Sudety The project presents research involving an analysis and evaluation of water supply of poorly permeable soils in drained arable lands. The analysis dealt with research conducted in 2003-2005 at similar meteorological conditions in an agricultural submountain catchment area situated in Central Sudety. In particular, the analysis concerned water and air properties of examined deposits with regard to their water-retention. The measurements of moisture density of soil profiles and calculated water supplies in layers 1-100 cm showed a cross-section of reserves of soil retention. This depended on the depth and lay of the land as well as drainage conditions. In the lower drainage area at the foot of the slope there was a notably higher level of groundwater than in other places on the slope. In areas where rainfall was the exclusive source of groundwater the measured water-supplies were lower than in multi-sourced drainage areas. The amount of measured supplies for the vegetation period spanning the whole research time was not lower than 70% of the field-water capacity.

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