How would you build a spring box in a running creek?

Basically it's a hole with a box sunken in that hole of a low flowing creek from springs

It's a way to store a larger volume of water and its kept fresh by the intake and exit of the slow moving water.

Here are the plans on how to build one and how it works

http://www.cee.mtu.edu/peacecorps/documents_july03/springbox_FINAL.pdf

If it is a Gold bearing creek, I would also build one of these:
Plan, Design and Build a Homemade Gold Sluice Box (http://nevada-outback-gems.com/design_plans/DIY_hand_sluice/hand_sluice.htm)