Here you go. I grabbed some from my personal collection and some from google searches for the area I grew up in and the formations I am speaking of.
Here is a semi-fresh ponding basin. These form throughout the hilly regions, especially in spring to early summer. They provide a riparian habitat for a number of months or throughout the dry parches summers, if there is a underground flow feeding them.
Here is another one that formed from high flow/rain levels
You can see a larger Arial shot here of one that has formed. This one is large enough and low enough in the valley, it will shrink but should stay throughout the dry months.
Here is what one looks like after suffering through a few months of the dry hot summers here. Temperatures hover in high 90's to low 100's (Usually not above 112) for 6 months of the year. Other three months are spring with about 10 to 15 days of rain max. The last three months are dry, cold, desert winter that drops to 30s. and 40s. Point being, these can last despite not getting rain for 330 to 340 days and having to make it through desert like conditions.
Here's a small one, but it will feed larger ones it trickles into.
Here is the last high country lake in the long chain that leads down to the valley and feeds all the ponding basin and aquifers. This lake is sitting a little over 10,000 feet and took about 30 miles of backpacking to get to. It's a perfect example of seasonal glacier lakes that feed the below hills and valleys that are hundreds of miles away.
Here is the drainage valley we hiked up to get to it. Might be nice example for trying to replicate high mountain terrain in game.
Here is one of the lower run offs from the above watershed that is a seasonal creek and turns into a ponding basin over summer until the next melt.
Here's another one. This is part of the same system that runs hundreds of miles through the high sierra and feeds a massive underwater aquifer and ponding basin system.