Lawn Drainage. While it is important for a lawn to be watered regularly, adequate lawn drainage is essential for a healthy lawn. If your yard has some swampy looking areas after every rain, here are a few suggestions to assist you with your lawn drainage problems.Click to see full answer. Similarly, does grass help with drainage?Grasses in general are tolerant of poor drainage simply because they are vigorous growers with extensive root systems that break up compacted soil and add organic matter, which helps to improve drainage by promoting soil aggregation.Secondly, how do you put drainage under grass? Before installing any drain lines, coarse stone or gravel should always be put in the bottom of the trench to a depth of approximately two inches. Once the drain line is installed, coarse stone or gravel should then be put on top of the drain line leaving approximately 3–4 inches for topsoil for the lawn to grow in. Moreover, do you need drainage for artificial grass? With artificial grass there is no need to worry about water drainage, artificial lawns drain water as if it is regular grass and even better in some cases. Water simply drains straight through these holes and into the aggregate base below. Due to this, artificial lawns dry relatively quickly compared to regular lawns.How do I dry out my yard?To dry out wet dirt, start by clearing out any debris, like soggy leaves and old mulch, since they store a lot of moisture. Next, spread 2-3 inches of gravel on top of the soil, then use a rake, hoe, or shovel to mix the gravel into the top 6 inches.