Underground drainage systems for a house guttering system provides a two-fold advantage for the homeowner. It removes water from the roof to the street or local drainage ditches. This will eliminate erosion and removes the water from the base of the foundation. The second advantage is that the system adds a more finished look to the house. However, these will become blocked with debris especially since they are underground and are usually only four inches across. Certain localities require an access point to the system every 75 feet. This will help with the cleaning and maintenance of the system.
Remove the screws holding the drain and the downspout together. Place the plumber's snake into the drain. These are large spring like devices that can be up to 150 feet long. The rotation of this device is powered by a small electric or gas motor. When you get around 10 feet into the drain, turn on the device.
Feed the snake into the drain until it either comes out the other end of the drain or you have reached the reservoir or access spot required by law. If you have reached the reservoir or access spot, open it with the screwdriver and remove the debris. Then place the snake into the next section of drain and repeat the process.
Remove the snake from the drain and place the power washer outlet into the drain. Turn on the power washer; this will remove the small debris that is sitting at the bottom of the drain. Most of this is the sand from the roof shingles, washed off during heavy rains.
Stop using the power washer and shovel the debris that has come out of the drain into your bucket. It is especially important to remove any debris washed into the street because it may clog the local drainage system. This can cause the homeowner to incur large fines.