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nt <br />ee"inq i <br />U1 <br />North Dakota Department of Health N Environmental Health Section <br />Sediment and Erosion Control Measures Recommended for Home Builders <br />If proper sediment and erosion control measures <br />are not installed during home construction, dirt can <br />reach streets, sewers and eventually bodies of <br />w <br />Sediment picked up by rainfall and <br />snowmelt runoff and carried to local <br />water bodies can cause problems for fish <br />and other aquatic life. Sediment -laden <br />water can also interfere with recreation <br />and water treatment. <br />During construction of new homes, <br />contractors must reduce the amount <br />of soil erosion and subsequent <br />sedimentation. Although the area <br />disturbed during new home construction <br />is typically less than one acre and <br />therefore not regulated by the North <br />Dakota Department of Health, it is part <br />of a larger common plan of development <br />that is regulated. <br />Sediment and erosion control devices <br />are only designed to handle a two -year, <br />24 -hour rainfall event. Such an event in <br />North Dakota generally ranges from 1.9 <br />inches of rain in the west to 2.3 inches <br />of rain in the east over a 24 -hour period. <br />The following <br />measures are commonly <br />recommended to <br />contractors for <br />controlling the runoff <br />of sediment from home <br />lots. <br />Perimeter Controls <br />Perimeter controls are <br />used to capture sediment <br />before it leaves the <br />construction site. These <br />types of controls include <br />vegetative buffers, silt <br />fences and sediment <br />logs. <br />ater. Vegetative buffers <br />consist of a minimum <br />25 -foot wide strip of 4- to 12- <br />inch high, dense grass. Silt fence and <br />sediment logs restrict the flow of the <br />runoff causing water to pond, thus <br />allowing extra time for the sediment <br />in the runoff to settle out. <br />Sediment Traps <br />Sediment traps are small detention <br />areas that allow sediment to settle <br />out of stormwater runoff. Traps are <br />usually located next to inlet structures <br />including manholes and inlets located <br />in yards. <br />Another type of trap that can be <br />used is called a cut -back curb. Cut- <br />back curbs are small traps used to <br />pond water behind the curb and gutter <br />system. <br />Inlet Protection <br />The purpose of inlet protection <br />devices is to reduce the amount of <br />runoff into the storm sewer. The inlet <br />device ponds the runoff, allowing <br />more time for sediment particles to <br />settle out. <br />Inlet protection devices are the <br />last line of control for capturing <br />sediment. They must be used with <br />appropriate perimeter controls and/ <br />or sediment traps. <br />Caution should be used when <br />choosing and installing an inlet <br />protection device so as not to cause <br />property damage due to flooding. <br />The device should be installed so <br />stormwater can bypass the device if <br />too much runoff is received. <br />Stabilized Site Access <br />A stabilized construction site <br />access reduces the amount of <br />sediment tracked from a site to the <br />street by vehicles or equipment. <br />Vehicles and equipment must never <br />be allowed to enter or exit the site <br />from any other area, especially <br />when there are wet soil conditions. <br />Roof Drains <br />All roof drains should be <br />provided with sufficient splash <br />pads and/or downspout extensions <br />to prevent erosion from roof <br />runoff. Roof drains may not be <br />directly connected to any storm <br />7AV04 Daleota DCA44 oneat od rye <br />5a*owx ae qea" s <br />P, 0, sm 5520 <br />Vawanc6, W 59506 -5520 C <br />701 - 328 -5150. <br />akuue1 l M&& state. Kd cca \ <br />12 1 North Dakota Water ■ May 2005 <br />