</font><font color="blue" class="small">( I was surprised to read your post. I've got all sorts of dips and low spots in my yard. A couple of TBN posts suggested sand too, but in small amounts. Did you really drop a load of sand and spread it around, AND have the grass grow up through it?
I"ve been sort of toying with the idea of a couple of buckets of sand, but somehow can't seem to picture it working.
Anthony )</font>
Hey Anthony,
I recommend sand for the more shallow dips. Work the large dips out with a drag of some sort, and plant grass.
Once the grass is growing vigorously and 1-2" tall, you can spread an inch or 2 of sand. The sand will sink a bit, so your grass will poke through it right away. It will not suffocate the roots like soil will do. The real magic begins when is rains. The sand seeks the lowest levels, and migrates to the holes and dips.
My last sanding project was ~4-1/2 years ago. I had a 500' long grass road. It was OK I guess, but had little whoop-de-do's (or washboard effect). When it rained, cars and even my riding mower left black mud tracks unless I waited until it was thoroughly dry.
I sanded the road with 2 inches of coarse sand (mortar sand, my supplier was out of the cheaper stuff) For 2-3 years the road was very smooth and level, and drained instantly after a rain. I could run on it right after a hard rain without leaving ruts or mud tracks. The grass became very smooth and attractive, and the sand did not show on the surface. Unfortunately, it's getting time to do it again. The next sand job will probably last a lot longer, because some of it is still there.
You should get the same results on your yard. However, the flatness will last longer because you will probably just run the mower on it.
Only down side is the weather! If you have a long dry spell right after sanding, you can't mow. Wait until most of the sand is hidden beneath the grass before mowing. Mow high, and keep the blade RPM down just a bit until the sand settles in, or it will be blown away.