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Hydrological conseąuences of human action..

on the lakes. In 1965 Piaseczno Lakę was provided with recreational facilities. A year later 6158 beds were offered on all lakes, over half on Lakes: Biale-Wlodawa and Białka. In that year 475,000 persons visited the Lakę Region, 284,000 of whom spent their weekends and feasts. On one sunny July Sunday 13,000 visitors arrived at Włodawa-Biale Lakę, 5000 at Piaseczno

A fragment of the eastern part of the Lakę Region

Fig. 7. Areas with recreation facilities

Lakę, 1500 at Białka Lakę, and 200 at Rogoźno and Lukcze lakes².

The beginning of the 70’s was a period of intensified building of private rest-bungalows. In 1989, the number of beds increased to 11,730 (Fig. 6), and bases for night accom-modation were organized on 13 lakes. The greatest intensification of building private rest-bungalows was observed at the beginning of the 90’s. It was developing spontaneously, particularly on the most attractive lakes with overcrowded recreation facilities existing earlier. Many lakes are surrounded by recreational houses (Fig. 7), which considerably reduce their natural attributes. In extreme cases, recreational bulding has entered swamps adjacent to lakes (lakes Piaseczno and Wlodawa-Biale). Spontaneous recreational management and utilization of the Lakę Region in recent years has resulted in a lack of current statis-tical data about the dynamics of these processes.

According to the authors’ estima-tions about a million people relax in the Lakę Region over the summer season. Overcrowding of some places insufficiently prepared to receive a large number of people causes degradation of the environment. Only a few owners of recreational objects are prepared to render proper services to tourists. Sewage stored in nogroundwatermetic

Data from unpublished Masters theses.