I had to deal with a similar situation on the stall side of our new barn. The existing grade directed all of the water towards the stall doors where it joined the run off from the roof. This didn't form a lake because it would run down the ramp into the pasture, eroding the ramp badly.
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I dug out a half swale, removing all of the topsoil and the top layer of the subsoil. The target grade was to drop 12 inches in 30 feet at one of the paddock and 18 inches at the other end.
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I back filled with bank run gravel at least six inches deep and covered with five inches of stone dust. The compound grade put all of the water in one corner of the half swale, just outside the paddock fence. I installed a french drain with a 6 inch in 10 feet drop to take the water away.
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We recently got 2 1/2 inches of rain in 1 1/2 hour. The paddock drained nearly perfectly. I could touch up the grade in the paddock, but the horse redefine it on a regular basis. I figure that regrading in the spring is all that I'll do for maintenance.
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Matthew

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