**4. Aquifer system**

The entire area of the district is underlain by the basaltic lava flows of the upper Cretaceous to lower Eocene age forming a hard rock aquifer. The shallow alluvial formation of the recent age also occurs as a narrow stretch along the banks of *Godavari* and *Girna* Rivers flowing in the area forming a soft rock aquifer.

The groundwater data generated from the monitoring wells, micro-level hydrogeological inventories, exploratory and observation wells, and various thematic

**Figure 2.** *Rainfall distribution.*

layers were utilized to decipher the aquifer disposition of the area. This substantiates information on the aquifer geometry and hydrogeological information about the region where these aquifers occur. In the area, alluvium and Deccan Trap basalt are the only formations. In Deccan Trap basalt, two aquifer systems have been deciphered, whereas in alluvium considering its limited thickness only one aquifer is established (**Figure 3**) as listed below:
