Wet weather creek problems

We just moved into a newly built home. When we bought the house, the yard was not graded or sodded at that point. The house is at the bottom of a small hill at the end of a cul-de-sac. We knew that the house would have a fairly steep slope to it. The yard had a small wet weather creek in the back, but it was never very much. When we moved in, the yard had not been graded due to a lot of wet weather the week prior. Even then, the little creek never seemed to amount to much, but we never saw it until after the rain, like after work or on out lunch hour. The yard was graded and sodded about a week after we moved in. The day after the sod, we get a thunderstorm that poured 5"-6" in an hour on the area. Well, the wet weather creek became a flash-flood creek and washed out a lot of the sod. No problem, just a freak coincidence, so the builder re-sodded the area. However the next week, we get some more storms that roll through, but not as severe. Still, the "little" creek quickly became another flash-flood creek that expanded to ~10' wide in my back yard due to all the run-off from my neighbors. The biggest problem is that it pools and stagnates in my back left corner, basically turning it into a marsh. My backyard is also bordered by established trees (one of the selling points) which keeps the backyard from drying out quickly. Also, my area (Kentucky) is a very heavy clay soil, which means that the ground does not absorb the water very well.
Okay, now my questions. What options do I have with the builder? Ideally, I would like to have a culvert installed so I can have a usable back-yard. I'd even be willing to pay for the culvert if the builder installs it. Yet, I know nothing of culverts, how much they cost, and even if this is a good option. Where can I find out more about this?
Thanks in advance.
Mark Darbyshire
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your local town, who may have someone in the roads department who can tell you how to mitigate this.
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