How much force does water flowing at a given speed exert on a surface?

[Locust]

So let's say you have water flowing at a given speed.
Ballpark, how much force can be produced with a given surface area?

It should be easy, but I've managed to fail physics over and over.
Good with math though. Relevant equations would make me extremely happy.

 

[tiny-tim]

Hi Locust!

Relevant equations would make me extremely happy.

mass = density times volume

force = rate of change of momentum

enjoy! ​

 

[srivi]

The force acting on the water can be calculated
F = Apv²

where A- area
p-density of water.
v- velocity of water.