The purpose of this project is to create a cozy atmosphere for your backyard, completing the lovely image of the pool area.
I tried to combine happy colors using plants that are specific to California climate, and paint some simple elements like tires.
The proposed design is easy to be realized since it contains simple elements. Yet it creates a colorful image for the backyard that kids will adore.
The problem with dirt flooding is solved by a dry creek as you suggested, filled with white gravel, in addition to the flatten area for sitting and playing.
I hope this project is what you thought your backyard could be, ie a place for relaxing and enjoying the view.
NOTE: you have to download the files attached, in order to see all the details.