simulate an area with bedrock jutting out in the Middle

How to simulate an area with bedrock jutting out in the middle. Rest of area is covered with alluvium and underlain by hardrock .

If you solve for groundwater flow only you could assign a very small hydraulic conductivity for these layers/elements to account for the impermeable nature of the bedrock. Alternatively, you could deactivate these layers/elements.

Thank You Kaiser I assigned low K and it worked.