Pumped hydro doesn't require a stream, since it isn't harvesting energy from a preexisting flow of water.

How are you going to create a large enough pond?

This involves moving earth in places with suitable topography. The economics depends on both the vertical offset between the two reservoirs, and how much earth has to be moved per unit of reservoir volume.

Algorithms have been created to use GIS data to automatically find potential PHES sites. There are lots of candidates. Australia, for example, has 300x more potential that it would need for a 100% renewable grid.

http://re100.eng.anu.edu.au/global/

Often there is already a depression you can use as is. Or deepen, and use the excavation for a dike.

If not, maybe there is a box canyon you can close the end of with a dam.

In places, they have flattened a convex hilltop and used the material to make a dike.

Usually you don't need anywhere near as much storage volume as a typical hydroelectric dam reservoir holds.

Maybe read up? When you just make shit up as you go along, you say dumb things.

Asking a question is not making things up.