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Yes, rain can affect the results of a perc test because it will partially saturate the soil and slow down the rate of drainage. Ideally, you should do a perc test during the driest time of the year and try to schedule it after a stretch of days where no precipitation occurs. This will give you the best chance of passing.

Yard grading is a key component of proper drainage because runoff naturally moves with respect to gravity. If you have low spots in your yard, rain and snowmelt will settle there and oversaturate the soil, promoting root rot and fungal growth. If the low spots are near your home’s foundation, you could even end up with foundation leaks or structural damage due to poor yard grading.

For minor unevenness, you don't necessarily need to remove grass before leveling. You can apply a topdressing mixture to fill in low areas and even out the surface. However, for more significant unevenness or deep depressions, it might be necessary to temporarily remove the grass to ensure proper leveling and soil compaction. After filling and leveling, you can replace the grass or consider reseeding the area.

Not typically. A paver patio drainage problem generally requires a landscaping fix that can include a drainage pipe or dry well capable of handling the amount of runoff in your yard.