geology question!!?

[fabiwabi]

If more ground water is pumped than what is recharged, this can occur
a. a drought
b. ground subsidence
c. local streams will increase in flow
d. local streams will decrease in flow

[matefate]

local streems to be low

[Nunitak]

I vote for both (a) and (b) with the qualification that while we are not affecting the weather by pumping so much, there will be less water to go around when it is rationed, and thus drought condition rises.

Don't see local streams' ups and downs as having so much to do with pumping as with weather. But a high aquifer may contribute to some lower stream. So, (d) could be a choice, but only at a stretch. Depends on how you define local.

[Geomatic7000]

^^^Explain.^^^

If you pump more than you recharge you are going to get what is called a losing stream. So you will see a decrease in stream flow. You will also see land subsidence.

So B and D are both correct.

[naturalplastics]

I would expect B and D are correct in some cases.

The local streams would decrease IF they were recieving groundwater inflow. Not always the case.
Ground subsidence CAN occur from overpumping, but only if the formation is shallow, unconsolidated and supported by pore pressure.

If the overpumping is happening on a deep aquifer and dumped on the ground, I guess you could make an argument for C also.

[Curiosity]

b. ground subsidence
Withdrawing more water from an aquifer than is recharged into the aquifer can result in ground subsidence. This happens is more common in the southwestern US.

d. local streams will decrease in flow.
When withdrawal of water is greater than the recharge, the water table is lowered.
As the stream flows over the ground, water is lost into the underlying ground because the water table is lower than the stream bed.