Mark the areas in your yard where puddles form or where the ground feels soggy. Insert a wood garden stake at the center of each spot and run a rope to connect each stake. Adjust the rope to form the straightest, most direct path possible from the furthest point to the chosen drainage outlet, like a ditch or street gutter.
Dig out a canal 8 inches wide and 18 inches deep with a shovel. Curve the sides to form a U shape. Beginning at the end of the canal, dig 1/4 inch deeper every foot of length to slope the pipes so water flows down toward the outlet.
Fill the first 6 inches with 3/4-inch aggregate.
Lay 4-inch perforated drain pipes over the aggregate. Turn the pipes so the holes face up if holes are only along one side. Slip a drain sock over the pipe a you lay it down to protect it from small debris.
Dump another 6 inches of aggregate over the pipes. Lay geotextile fabric over top to block large debris like sticks and leaves.
Fill the remaining canal with a mix of soil and sand. The sand will help water seep through into the drain pipes below.
Lay grass seed down over the exposed dirt and spread straw or breathable fabric over top so it doesn't blow away.