Answer: You will want to wait until the ground dries up before doing anything in your back yard. If you work soggy soil it will become even more compacted and nasty. Wait until the water subsides and then rototill the area. Add organic matter or aged manure and rototill it again. Then level the area and either lay sod or broadcast your seed. Fescues are the most shade tolerant of all grasses. Diverting water from the downspouts is a good idea - you may also end up installing curtain drains or even digging out a shallow area and directing the excess water there to keep your lawn high and dry. This shallow depression is called a rain garden and you can plant lots of moisture loving plants around the perimeter to help hide the area when it is filled with water. Best wishes with your landscape!
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