The supply of fresh water Petrodvorets, Lomonosov, the red Village is due to extraction of groundwater. In particular, Krasnoselskii water system water is supplied from captaia, created on the basis of deposits of fissure-karst waters. On the fissure-karst aquifers the drilling of wells. and water features a good quality. Deposits of karst rocks in the Leningrad region found extremely small, but in Boksitogorsk district of the nature of karst is manifested in all its glory.
On the border of Leningrad and Novgorod areas there are lakes and streams, United in Spirovska water system length of approximately ten kilometers. Lakes and rivers have karst origin that makes them exceptional properties, namely, periodic disappearance, when the waters suddenly disappear with all its inhabitants, and then just as suddenly re-emerge.
Spirovska lake is not too deep and are renowned for with numerous bays and tributary waters in the rivers and rukako. The lakes are replenished with water mainly due to numerous natural springs. Every 5-7 years is incredible: water from lakes goes underground through sinkholes large diameter — one of which reaches 40 meters in diameter. The water noise is drawn into the mouth, literally a week later, the lake dries Continue reading