Summary:

In this paper the scope of hydrological investigations and the results obtained in year 2013 on monitoring station at the Tuczno forest inspectorate was presented. The analyzed area is located in the north-west part of Poland in Pomerania province. Three of four components of water balance were directly measured in vertical profile : precipitation (P), evapotranspiration (E) and changes of water retention (soil moisture) (ΔR). The outflow (H) was computed by use of following equation: H = P - E - ΔR. In order to measure above mentioned parameters we have used set of instruments consisted of: tipping bucket rain-gauges A-STER and WXT510 meteorological station (precipitation); - eddy covariance system (anemometer CSAT 3 and Li-7500 IR gas analyzer) - evapotranspiration; - and few reflectometers CS616 (TDR method - soil moisture). Changes of water retention in 30 minute periods, calculated on the basis of soil moisture fluctuations indicate that they show synchronous fluctuations in the respective sums of precipitation. The amplitudes of soil moisture fluctuatons are inversely proportional to depth the u.s.a. Computed average value of specific outflow oscillate between normative values for this region.