Geology
The entire area is covered by the Deccan Traps lava flows of Upper Cretaceous to Lower Eocene age. The lava flows are overlain by thin alluvial deposits along the Kham and Sukhana river. The basaltic lava flows belonging to the Deccan Trap is the only major geological formation occurring in Aurangabad. The lava flows are horizontal and each flow has two distinct units. The upper layers consist of vesiculara and amygdaloidal zeolitic basalt while the bottom layer consists of massive basalt.The lava flows are individually different in their ability to receive as well as hold water in storage and to transmit it. The difference in the productivity of groundwater in various flows arises as a result of their inherent physical properties such as porosity and permeability. The groundwater occurs under water table conditions and is mainly controlled by the extent of its secondary porosity i.e. thickness of weathered rocks and spacing of joints and fractures. The highly weathered vesicular trap and underlying weathered jointed and fractured massive trap constitutes the main water yielding zones. The soil is mostly formed from igneous rocks and are black, medium black, shallow and calcareous types having different depths and profiles.
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