Sidewalks, patios, and driveways pose special problems for gutter drainage. Many times the home roof design requires a downspout in an inconvenient location. In colder climates, water from gutters that drain into a sidewalk entrance can be dangerous as the water will freeze and create a slip and fall hazard. Draining water into a flowerbed between the house and the driveway is not an option because concrete or brick pavers will act as a dam, holding water against the basement wall and helping basements get wet and drip. A sidewalk cross drain (CSD) is designed to carry rainwater from downspouts safely and discreetly through the sidewalk, driveway, or patio.
Think of your rain gutters as a total “system.” Start by making sure the gutters are clean. You don’t need me to remind you that cleaning the gutters twice a year is mandatory. Spring cleaning, after the seeds and helicopters come down, is the most important. Many seeds float and quickly make their way to the downspout where they will clog in no time. Spring cleaning, after the seeds and helicopters come down, is the most important.
Three to four foot extensions are needed at the bottom of the downspout. The lower elbow should be about 18 inches off the ground to ensure a good slope for drainage. The soil or slope around the home should allow water to drain off the foundation. Rain barrels can also be used to collect and store rainwater. There is a fitting at the bottom of the rain barrel, so a common garden hose can be attached allowing you to use the water as needed in your flower or vegetable gardens.
Now you can take on the task of draining rainwater under and out of areas where there is pedestrian or car traffic around your home. The “Cross Sidewalk Drains (CSD)” come in various styles and sizes prefabricated. The most economical CSD is a sturdy polypropylene channel and grating and is suitable for most pedestrian applications. Heavy-duty CSDs with a polymer concrete channel and metal grating cover that installs along the sidewalk or driveway will provide a safe, level surface for walking or driving. (ACO Markant is a manufacturer of CSD http://www.acomarkant.com/)
Do not use irrigation pipes or tubes because they will eventually clog and there is no way to clean them. Animals like rats will use them as a home. The metal grill of a CSD can be lifted up for cleaning, and because it is open to light and air, rodents will find an unattractive place to build a home.
If you are working with an existing sidewalk or patio, some concrete blocks or pavers will need to be cut. The heavy power tools needed to make clean and precise cuts are available at your local tool and equipment rental store. Make sure you have enough slope on the CSD for the water to drain properly under the curb. A French drain or rain garden may also be needed on the opposite side of the path.
A brick or concrete paver contractor will install sidewalk cross drains as well, but as always, make sure your contractor is licensed and insured.