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Mdot drainage manual -
Report a State Road Drainage Issue. Name First Last. State Route Location - Please provide a detailed description. Attach Photos Max. We use cookies to analyze site usage. For more information and to manage consent, please see our. Functional Functional Always active The technical storage or access is strictly necessary for the legitimate purpose of enabling the use of a specific service explicitly requested by the subscriber or user, or for the sole purpose of carrying out the transmission of a communication over an electronic communications network.
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Under each of these categories exists a large inventory of BMP options for implementation. In trying to develop an approach to move from inventory to implementation, categorizing BMPs by appropriate land use, pollutant s addressed by each, etc, can help in prioritization and selection. Vegetative BMPs allow for storm water to infiltrate, reduce erosion, and filter sediments and other pollutants.
In the urban landscape vegetative BMPs are most easily applied to developing land. Utilizing Vegetative BMPs in existing highly developed areas can be difficult because of the need for space. The buffer helps acts as a filter to reduce soil erosion and sedimentation from entering the watercourse.
Vegetated Swales are vegetated shallow channels with a dense stand of vegetation covering the side slopes and channel bottom that treat concentrated flows. Temporary Seeding and Permanent Seeding for Erosion Control is an inexpensive, yet effective, method of stabilizing flat areas and slopes.
Use of Mulching and Matting to Establish Vegetation covers exposed soil areas with straw mulch, mulch blankets, or high velocity mulch blankets. Temporary and Permanent Seeding. Structural BMPs can be used in most situations and have a wide range of costs.
It is used to eliminate the need for stone check dams and can be both installed and removed by one person instead of heavy machinery. It can also be recycled when finished and used on a different project.
Review example list on next slide. Geotextile Silt Fences are a permeable barrier used to capture sediment from sheet flow. This BMP must be maintained on a regular basis or when sediment has accumulated to half the height of the silt fence. Gravel filter berms are used to clean water as it flows through.
Gravel filter berms are to be placed wherever a concentrated water flow requires filtering before leaving the construction site. Ponds Basins are designed to capture a storm water runoff volume, hold this volume and infiltrate it into the ground over a period of days.
Basins are typically not designed to retain a permanent pool of water. Drop Inlet Structures are a temporary or permanent device used to trap sediment from stormwater before it enters the storm sewer system.
This BMP must be maintained on a regular basis or when sediment has accumulated to half the height of the inlet. Drop Inlet Structure. Making sure the soil erosion BMPs are on plans and reviewing maintenance operations to reduce runoff potential are both examples of operational BMPs. Also street sweeping during dry weather can remove significant amounts of pollutant laden street dirt and trash while preventing its travel to the nearest water body.
Catch Basins should be cleaned at least times per year to keep them from building up large amounts of sediments. Delay of catch basin cleanout leads to improperly operating catch basins. It is also important to follow the Spill Response and Prevention Plan to avoid and treat spills when necessary. Finally, all BMPs will need to be maintained to some level after construction. This can vary widely depending on the type of BMP.
Street Sweeping. Structural BMPs Biofilters are of two types: swales and strips. Infiltration Vegetative Filter Strips are densely vegetated, uniformly graded areas that intercept sheet flow and are usually placed parallel to the contributing surface. Check Dam is a device constructed across ditch lines used to reduce velocity of concentrated flows in the ditch and to protect vegetation. Concrete Grid Pavements are lattice grid structures with grassed or pervious material placed in the grid openings.
Their use, however, is generally restricted to parking areas and driveways. Catch Basin Inlet Devices are devices that are inserted into storm drain inlets to filter, or absorb sediment, pollutants, and oil and grease.
These devices are typically placed at locations with a high potential for contamination. Dry Detention Basins are basins that are dry between storms. During a storm the basin fills. A bottom outlet releases the storm water slowly to provide time for sediments to settle. Diversion Dike is a temporary or permanent ridge of compacted earth constructed across sloping land to protect work or sensitive areas from upslope runoff by diverting flow away.
Energy Dissipators are used to control erosion in a channel or conduit by reducing the velocity of flow and dissipate energy at outlets of channels or conduits. Infiltration Drainfields are infiltration systems that capture a volume of runoff and infiltrate it into the ground. The system consists of a pretreatment structure, a manifold system, and a drainfield. Infiltration Trench is a gravel-filled trench designed to infiltrate storm water into the ground. Typically infiltration trenches can only capture a small amount of runoff, and therefore, may be designed to capture the first flush of the runoff event.
For this reason, they are typically used with other BMPs, such as detention basins to control peak flows. Provides a pool for velocities to slow down and sediment to drop out of traveling water. Mulching and Matting is used to provided immediate stabilization on a site after earth disturbing activities.
Seeding should be included in the mulch or spread prior to mulching and matting. Documentation on maintenance activities and inspections should be kept in a log book. A reporting mechanism should be in place to assure inspections and maintenance are being kept up to date, this will be implemented by following the MDEQ issued permits and submitting annual reports describing the maintenance activities and inspections.
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