Fig.2. A: Linear trend function of precipitations;
B: Upper Jurassic underground water
level fluctuations at Chechlo;
1. trend of precipitation; 2. perennial mean of precipitation; 3. annual
precipitation amount;
4. trend of water level of Upper Jurassic aquifer; 5. perennial mean of water level
height;
6. annual mean of water level height; 7. periods of dried well.