![]() Does Drain Tile Need to be Sloped? | The Real Seal LLC French Drain Installation Guide French Drain Calculator Surface Type See Also Determine the proper depth + slope for a French Drain. The flowerbed is 120 sq feet, the grass area is 480 sq feet and the concrete deck area is 800 sq feet. Q = peak runoff flow (gallons per minute)įor our example, we already know the area (A) of each zone to be drained. A frequently used formula for calculating the maximum runoff potential from a small area (under 200 acres) is the Rational Method. In order to correctly size the drainage pipe network, the maximum run-off flow for each area must be calculated. STEP 2:Ĭalculate the maximum run-off potential flow for each area. Keep in mind that the table below has been simplified (more sophisticated data is available on the web that contain 100 year one-hour rainfall maps, etc.)ĪL, FL, GA, HI, LA, MS, NC, OK, SC, TN, TXĪR, CT, DE, DC, IA, IL, IN, KS, KY, MA, MD, MI, MN,MO, ND, NE, NH, NJ, NY, OH, PA, RI, SD, VA, WV, WIĪK, AZ, CA, CO, ID, ME, MT, NV, NM, OR, UT, VT, WA, WYĪs the property in our example is in Atlanta, GA, it falls into Rainfall Intensity Zone A with a Rainfall Intensity of 5.0 inches per hour. ![]() Use Table 1.1 below to determine the Rainfall Intensity (I) of the property. STEP 1:ĭetermine the Rainfall Intensity of the property.ĭifferent parts of the country have varying rainfall intensity profiles. The distance from the backyard to the street is 100′. The flower bed area is 6’ wide x 20’ long (area of 120 sq ft), the grass area is 20’ wide x 24’ long (area of 480 sq ft) and the concrete deck area is 40’ wide x 20’ long (area of 800 sq ft). The backyard is comprised of 3 areas, a loamy soil flower bed, a grass area and a concrete deck. ![]() In order to help understand the basic steps of designing a drainage system, consider the following example:Ī contractor needs to install a drainage system in the backyard of a house in Atlanta, Georgia. Be generous in the design-if in doubt add an extra collection point (grate) and rather oversize than undersize a component.Although obvious, water can only flow downhill.Design for worst case conditions and not for average conditions.Excess water always collects at the lowest elevation points. ![]() Before we start there are 4 important points to remember: Download Tempo Drainage Design Guide Basic drainage design is relatively simple by following this easy 10-step process. ![]()
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