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1 Przegląd Geofizyczny

1 2002

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O zasobach i niedoborach wodnych we wschodniej części województwa mazowieckiego (na przykładzie zlewni Wilgi)

Jaworski J., Krupa-Marchlewska J., Szkutnicki J.

Przegląd Geofizyczny

2002

Z. 3-4

225-240

The paper deals with the problem of water resources and water deficiences in the eastern part of Mazowieckie Palatinate (on example of the Wilga River basin). The investigations were realized in the period 1976-1990. The Wilga River basin with an area of 231,6 km2, has mainly an agricultural character. Basing on results of experimental and theoretical investigations, the water resources (equal to the mean low river flow SNQ), the deficience of precipitation No, the soil moisture values in the upper layer of the aeration zone, the deficit or surplus of soil moisture and the soil drought periods were estimated. It was stated, that the precipitation deficit as well as the soil moisture deficience and soil drought play an important role in hydrology, because of the diminishing of water resources also in the saturation zone as a consequence of braking the filtration process in the direction of the ground water table and - last but not least - because of the reduction of the river flow in the basin. The largest soil water deficiences (-NZG) appeared mainly in June and July (-13,8 mm; -22,3 mm). One month later, in August - the least value of mean low river flow was noted (SNQ= 0,270 m3/s). In the investigated 15-years period intensive soil drought conditions during 14 years were noted. A significant influence of soil drought conditions on the hydrological processes - also on river flow - was stated. The investigations have shown, that the disposal water resources of the Wilga River (DZQ) could be used for irrigation purposes; in June an area of 500 ha, in July and August areas of 370 ha and 270 ha could be irrigated. Taking into account the large soil moisture deficits in the basin, these irrigations are urgently needed.