We have a run off issue in the backyard and can't figure how to fix?

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could it be a gray water line? one way to test it when doing laundry go out and see it water is coming out there. I hope it is not sewage.

somewhere in these DIY pages, are photos of this same problem.. the problem was solved with different colored river stones One that I saw looked like an oriental rug. It was just the river stones arranged in a very decorative design right thru the front yard. It was about 18 to 24 in wide. With water, it looked like a little stream. When your creative self kicks in, other things might be fun to add. Smoothed broken glass (beach glass) , marbles, broken pieces if china, and who knows what else you might think of.

check pintrest. There is a page dedicated to this problem