[sammyg2]

A while back, I noticed the gutter in front of the house was wet with water flowing for a few days straight and I traced it back to the drain from my back yard.
That didn't make sense because everything in the back yard was dry.

Further investigation revealed the culprit:

My pool has an automatic fill valve, and the plastic float had cracked and partially filled with water.

That raised the level in the pool slightly. When the built the pool they didn't give that level setting much room for variance and that extra half inch was enough to reach the over-flow drain, which was connected to the drains in the yard.
The pool valve kept trying to raise the level by adding water, which went right out the drain to the street.
I replaced the float valve (under $20), reset the level a little lower, problem solved.

If I had not noticed the water in the gutter out front I would have kept dumping water into the street for a lot longer than just a few days.