Draining a yard involves pumping standing water out of the yard and installing a proper drainage system in the yard to prevent further water logging. To avoid breaking any utility pipes passing under the yard, allow a local utility company to check the yard for the pipes before attempting to establish the drainage system.
Pumping the water from the yard involves connecting a pump to the stagnant water, and allowing the pump to suck and direct the water to an area of land where the water drains away. Be sure to pump the water to a lower area to prevent reverse flow. Installing the drainage system involves creating a trench, filling the trench with gravel and coarse sand, and planting grass over the trench.
To create the trench, first measure, and mark across yard's lower section where you intend to dig the trench, and use a shovel to dig the trench to a depth and width of 12 and 6 inches respectively, taking care to establish a slope on the trench's floor as needed to facilitate water runoff. Be sure to double the trench measurements if the yard floods excessively and frequently. After digging, pour 1-inch sized gravel in the trench, leaving about a 3-inch distance from the top of the gravel layer to the trench's top. Then, add a 3-inch coarse sand layer on top of the gravel before planting grass seed over the sand. Secure the seeds in place with straws temporarily, and water them regularly until they establish roots.