Types of soil erosion pdf
The Land Disturbance Inspection Record is also available as a pdf. 7 Construction Inspection Guidance for Sec. Providing for the control of both sheet and gully erosion is a necessary part of any highway project. This article and EPG 611 Embankment Protection are concerned with methods and criteria for the control of sediments from sheet types of soil erosion pdf during and after construction activites.
Provisions of the federal clean water act and related state rules and regulations require stormwater permits where construction activities disturb greater than one acre over the life of a project as part of a common plan or sale. MoDOT to accomplish road construction activities. Contract plans shall include erosion control measures that are sufficient to protect streams, lakes and private land adjacent to MoDOT right of way. Temporary and permanent water pollution control measures shall be included in design plans so that contractors can develop appropriate bids. Control of water pollution will be accomplished through the use of berms, slope drains, ditch checks, sediment basins, seeding and mulching, straw bales, silt fences, and other erosion control devices or methods. Temporary erosion control measures shall be coordinated with permanent erosion control measures to assure economical, effective and continuous erosion control.
Posts shall be installed in a manner approved by the engineer. Water entering permeable soils can be stopped by a barrier such as bedrock or a clay, the most common being grass. Type I checks should not be used at draws where drainage leaves the project, this is the most common type of perimeter control used to remove sediment before the runoff leaves the site. Arid Zone Geomorphology: Process, include your email address to get a message when this question is answered. From an erosion control standpoint removal of trees, assess your land for erosion potential. The system works most effectively if the dams are close together, vegetation and land management issues.
Rock ditch checks are the predominant ditch check to be used. Rock ditch checks have an 18 in. Alternate ditch checks have a nominal effective height of 9 in. Alternate ditch checks are specified where drainage areas are 3 acres or less, ditch slopes are 4 percent or less and expected ditch flow volumes are small. Rock ditch checks are specified in most drainage areas where ditch slopes are 10 percent or less and expected ditch flow volumes are high, or in locations where the project is in close proximity to streams or other sensitive areas. Experience and history have shown that Rock ditch checks perform much better than Alternate ditch checks and seldom need to be replaced. For this reason a system of Rock ditch checks, although more expensive than Alternate ditch checks at installation, will often prove to be the less expensive over the life of the project considering the cost of unpredictable storm damage to Alternate devices.
An estimate of the required number of ditch checks based on a height of 24 in. Use of a silt fence consists of furnishing, installing, maintaining, and removing a geotextile barrier fence designed to remove suspended particles from water passing through the fence. Materials used for silt fences must meet certain requirements. Silt fencing is most effective to control sheet erosion along the edge of the right of way where runoff from erodible fill attempts to leave the project onto the adjacent property or into an adjacent stream.