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My back yard slopes toward my house. Below is a picture taken from my dining room to help explain things. Previous owner had a french drain installed marked by the red lines. We've had a week or so of rain and low temperatures. Everything inside the red lines toward the house is dry (reasonably dry for the amount of rainfall). However, everything outside the red lines is complete mush. Hard to walk in and impossible to cut grass.

So my question is: would it be possible or worthwhile to put another french drain further up the hill by the trees to collect water? The hill actually continues to rise about double the length you see in the picture to some more houses on top, so there is a significant amount of surface area up the hill. The hill goes up very sharply to the right of the photo due to a large sewer block.

Would even digging a simple trench at a slight diagonal angle across the tree line help at all?

Back yard slope

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    if you are able to dig a trench and leave it open for a few days, then dig a trench along the tree line and see how much water it collects ..... even a few holes instead of a complete trench would give you the idea about the amount of water that is passing the holes – jsotola Nov 5 '18 at 19:29
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I would add the new drain at the edge of the grass up to the right (not two close to the trees) and continue it to the original drains. You can tell the original drain is working because it is mushie beyond that point this would have been the location I would have used at first but it is longer thus cost more and the previous owners may not have cared about the lawn much in the winter. A new drain should do the work of drying out the lawn.

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