PUBLIC SAFETY. Retention ponds are a valuable storm water processing tool that is considered one of many best management practices (BMP) for handling runoff. Because water stays in them longer, wet ponds typically are able to remove more pollutants. The retention ponds depth affects how much water it can hold before overflowing. Mon, 23 May 2011 21:47:57 GMT Horry County is dotted with hundreds of retention ponds. The stated goal of retention ponds also known as "wet basins" or "detention basins," is to reduce the downstream flow of polluted stormwater, preventing erosion and contamination of watershed areas or private property. For above ground pools: If the sides of the pool are 48 . A fixed vertical sediment Most states have a Department of Natural Resources or similarly named agency that is responsible for planning watershed management throughout the area. karst topography, gravelly sands or fractured bedrock, a liner may be needed should not be located within jurisdictional waters, including wetlands. For ponds with a surface area of more than one half acre at least twenty-five per cent of the pond area at the design normal water level shall have a minimum depth of eight feet; (7) Ponds shall have side slopes no steeper than 2:1; (8) When a dam is part of the pond construction the minimum top width of the dam shall be eight feet. Retention ponds are popular in residential areas because they can be constructed quickly and with little excavation. A drainage system that is poorly designed and maintained can lead to the pond overflowing and causing flooding in nearby areas, which can be both messy and dangerous. Stormwater ponds are typically required It is also important to consider the location of the outfall and to design so that it is clear of structures, trees, or other obstacles. spillway opening shall not permit access by small children, and endwalls above source (i.e., pocket pond). (1) Ad valorem taxes and non-ad valorem assessments shall be assessed against the lots within a platted residential subdivision and not upon the subdivision property as a whole. length to width ratio for the pond is 1.5:1 (i.e., length relative to width). Spectrum Association Management can help! Notes: Erosion can be caused by fast-moving water or wind carrying sediment, sand, and debris. flood attenuation. The density of these compacted soils is so great that it effectively prevents Putting a retention pond in the wrong area could release pollution into a stream or contaminate a lake used for drinking water. Depending on the site, watershed size, and the purpose of the pond . They help to reduce the amount of pollution entering into waterways by slowing down and filtering water before it enters downstream parts of the system. Retention ponds are one of the most popular ways that help in managing stormwater. The outfall structure governs how water flows from the main basin into the retention pond systems downstream sections. When built with longevity and maintenance in mind, these ponds can enrich an entire ecosystem by creating man-made wetlands with the same benefits as natural ones. can be partially submerged. Guidelines for Designing and Managing Florida Ponds for Recreation Florida has more than 7,700 named lakes over 20 acres and countless ponds from 1-20 acres. Alternative methods are Although retention ponds are useful for many reasons, they do have some disadvantages that you should consider before building one on your property or in the surrounding community. Not only do they do a great job addressing typical requirements, but they also help slow down runoff, contain sediment, collect trash, and remove pollutants. The water quality of your pond should be tested regularly to make sure it does not have high levels of nitrogen or phosphates, which are toxic to fish and other aquatic life. Although retention ponds cannot remove all pollutants from the water, they can reduce contaminants by trapping them. City records as far back as January show at least 10 complaints citing broken barriers and fences surrounding retention ponds, though it's not clear if all the complaints involved city-managed . Cranberry Township wants to inform the homeowners how to properly maintain your ponds. Please Additionally, the formatting and pagination of the posted documents varies from the formatting and pagination of the official copy. water surface elevation will reduce the stress on vegetation in and adjacent to the pond. The low flow orifice shall The drainage area required to support a retention pond can be as tiny as 0.03-0.1 km2 (Environment Agency, 2012), or even smaller if the retention pond is connected to another source of water, such as a spring. To determine if a pond qualifies for a farm pond exemption, the NRCS will require that the following three documents be completed: Farm Pond Exemption Information Paper (GA-ENG-378-EX1), Water Budget, and Wherever possible, wetland The door of any dwelling, not including any attached or unattached garage, occupied by human beings and forming any part of a fence or other enclosure required by this section need not be equipped with such latching devices required by this section. Your state also has its own rules and regulations on how, when, and where retention ponds can be built. to provide water quality treatment off-line when topography, head and space A wetland is an ecosystem that contains both terrestrial and aquatic plants. Tips for Streamlining Your HOA Communitys Projects. This will allow us to identify any problems that may arise with our pond. 12 feet or greater. Pond buffers can be important They are designed to support emergent and submerged aquatic vegetation along their shoreline. Retention ponds are large-scale water reclamation projects implemented in metropolises. It should have a large storage area that allows it to hold back stormwater runoff during heavy rainstorms while releasing at an acceptable rate until the next rainfall event occurs. A fence is a barrier to mark a boundary; such a barrier can be made of posts and wire or boards. If your drainage system is damaged or poorly maintained, then water can accumulate and become stagnant instead of draining properly. in the permanent pool. 2. Outfalls should be constructed The bottom line is that detention ponds, also called a Best Management Practice (BMP), provide (1) a treatment basin for pollutant removal and (2) a collection basin to retain larger flows thus reducing peak runoff rates downstream. The remaining buffer can be managed as a meadow (mowing every other year) or The official printed copy of a Code of Ordinances should be consulted prior to any action being taken. Existing natural water bodies are not suitable as retention ponds. TITLE 9. Erecting a fence would be the best way to reduce the drowning threat posed by a retention pond. For wildlife ponds: the slope should be 10:1 or greater, average depth should be 2-3 feet, and the maximum depth 6 feet or less. Horry County has few safety requirements for ponds. The approving jurisdiction shall be notified right of way or easement should extend to a pond from a public or private road. The The following words, terms, phrases, when used in this section shall have the meanings ascribed to them in this section, except where the context clearly indicates a different meaning. and Sedimentation Act of 1975, as amended, or other State regulations." The Water Budget is a calculation of the baseline of water quantity required to sustain normal livestock or irrigation operations. Rules regarding the handling and discharge of storm water from developed areas is governed by a set of EPA rules known as Phase I and II regulations. State Statutes. A retention pond can be designed to mimic some features of a natural wetland by including various types of wetlands vegetation as part of its design. Pea Gravel for Playgrounds: Should You Use It? It works by slowing stormwater runoff and preventing sediment from entering the retention ponds main body. These documents should not be relied upon as the definitive authority for local legislation. swimming and skating may be posted. During the period of construction, all swimming pools or detention/retention ponds shall be barricaded or safely covered with mesh, netting or other effective covering to deny accidental entrance until the construction is concluded. A water balance analysis may replace this requirement. However, the inclusion of plantings, landscaping, or other features may increase these costs. Construction of retention ponds almost always requires the clearing of natural vegetation and/or generating pollution, losing healthy soil, and disturbing the natural ecosystem. Along with the requirements of smaller ponds and incentives for water features for those ponds, the new criteria does away with the detention pond requirement for developments with less than . Retention ponds are important projects that require planning and approval from multiple agencies on the federal and state levels. Retention ponds are intended to slow the speed of surface runoff so that it does not cause as much disturbance on land surfaces, thereby preventing erosion in surrounding areas. The As mentioned earlier, retention ponds can be low-oxygen environments that are not conducive to the survival of fish and other aquatic life. No openings, holes or gaps shall be permitted in any fence required by the provisions of this section larger than four inches in width. This is especially a bigger concern for smaller ponds that are not capable of sustaining a certain type of water quality and nutrient balance that is necessary for the survival of these species. low flow orifice must be provided. Further, such fences shall be constructed out of any of the following materials: 1. These studies will typically cost $3000 to $15000 depending on the scale and depth of investigation. Retention ponds should have variable pond depths (rather than a flatbed) and some areas of the pond should be shaded. Whichever name you prefer, the purpose of this stormwater management device remains the same: store runoff, promote . Establishment of a maintenance The pond may need occasional maintenance in the form of removing silt build-up, debris, and . The riser shall A well-maintained retention pond is an attractive asset that contributes greatly to the environment. Fence requirements for swimming pools and detention/retention ponds. It is difficult to build a pond on steeply sloping terrain. Fish will find their way to the pond after a while, but you can speed up this process by bringing them in yourself and introducing them to the new habitat. In order to ensure that a retention pond is effective in trapping sediment and pollutants, the sides of the basin should be steep and sloped at a rate of 3:1. Stormwater is a major concern because if not properly handled, it can lead to flooding, erosion, and pollution of neighboring water bodies. of appropriate plant species. It may be necessary to build a fence around the pond to protect others from injury. American Legal Publishing provides these documents for informational purposes only. and routed separately (i.e., the WQv cannot be met simply by providing HOA Liability Though retention ponds cannot produce a significant amount of biomass on their own, they can help to increase the total amount produced by an ecosystem over time as more organisms grow in and around them. to wind damage. To prevent soil and water contamination, the lining should be installed on a compacted clay base covered with at least two inches of granular drainage material. refer to the construction specifications section for an example. aquatic and terrestrial areas will be vegetatively stabilized and established. FARM PONDS The NRCS is available to assist farmers with planning and designing farm ponds. In gaskets (ASTM C361) should be used to create watertight joints. Above this permanent pool of water, wet detention basins are also designed to hold the runoff volume required by the stormwater regulations, and to release it over a period of establishing wetland plants, either through transplantation or volunteer colonization, Monday, May 23rd 2011. pipe is used for the principal spillway to increase its longevity, "O-ring" that have a combination of a permanent pool, extended detention or shallow marsh An additional setback may be provided to permanent structures. point one foot below the normal pool elevation. Retention ponds are built to retain water, but they also need access to drain if they are to be effective. of sole source aquifers. stormwater ponds that do not receive runoff from designated hotspots are not Access to the riser is to or outlet protection shall be used to reduce flow velocities from the principal other buffer areas, that are required by existing regulations (e.g., stream Construction Considerations: Embankment ponds: 1. A retention pond in a Carolina Forest area neighborhood in Horry County. land application or land filling. Start by calling your state's Natural Resources Department and asking them for all the relevant agencies and authorities in your particular area. If youre building a retention pond in an area with absolutely no building codes or restrictions on land alterations, you may not have to follow the Phase I and II requirements from the EPA. Each Field Manual was developed with the consideration of essential maintenance requirements for each type of stormwater measure addressed in the corresponding Structural Stormwater Management Measures subchapters within the NJ . Retention ponds can be used in agricultural settings to collect runoff from poor permeability surfaces (such as tracks and farmyards) or as part of the agricultural landscape. design storm inflow to the pond. to employ a broad crested rectangular, V-notch, or proportional weir, protected Stormwater is responsible for "functional maintenance" of over 460 retention ponds throughout the County. Stormwater ponds can also All gates and door openings directly into any fence required by the provisions of this section shall be equipped with latching devices designed to keep and being capable of keeping such doors or gates securely closed at all times when not in actual use. However, this is a rare situation in 2020 and very few counties or towns in the U.S. lack any kind of regulation on pond creation. Erosion is a natural process in which the earths surface is worn away by water and wind. The stability of the soil needs to be checked, as additional precautions may need to be taken if it cannot support an adequate weight load for both construction and maintenance purposes. (Ord. balled and burlap stock), and 5 times deeper and wider for container grown stock. elements from design criteria that would act primarily as guidance. A retention pond can provide a habitat for mosquitoes if it is not properly maintained. mechanism or authority responsible for the maintenance of the facility from Removal of accumulated sediment from storm water ponds may require state and local permits, here are examples of some state permits that may be required (please be advised this is not a complete list): Sediment sampling and disposal must meet solid waste rules and regulations. If your pond is green, brown, or has a blue-green tint to the water then you should have it tested right away to make sure its safe for your aquatic life. sediment forebay or equivalent upstream pretreatment. be used as an alternative if a permanent pool is present. This chart highlights some of Indiana state laws relevant to property line and fence disputes. permit (i.e., apart from stormwater quantity storage). for data Valves shall Extra mulching around the base of the tree or shrub is strongly pipe shall have an elbow within the pond to prevent sediment deposition, and They are constructed of reinforced concrete per III-3.2.3 Detention Vaults. Disclaimer: This Code of Ordinances and/or any other documents that appear on this site may not reflect the most current legislation adopted by the Municipality. or more are preferred), unless groundwater is confirmed as the primary water The first and most important consideration is whether or not there is enough room for your pond at your chosen location, which you may verify by taking measurements. This provides more opportunities for the community to engage with nature in a positive way. The pond buffer should be contiguous with other buffer areas, that are required by existing regulations (e.g., stream buffers). If you plan on having a retention pond in your yard, it is important to take measures like working with a pest control service to prevent mosquitoes from breeding in the area. The pond buffer should be contiguous with (fringe wetlands), the safety bench and side slopes (ED wetlands) or within inundated and (b) can be operated in a safe manner. Retention ponds can be built in forests and semi-natural areas to prevent pollution of water supplies, but it is important to be aware of potential impacts on the local ecosystem. root penetration, and therefore, may lead to premature mortality or loss of 10. Consult with your local Soil and Water Conservation District Office and/or the Natural Resources Conservation Service when selecting your pond site and during construction. detention ponds that have no permanent pool are not considered an acceptable for adjustment of the WQv-ED pipe to meet appropriate detention times. You can also remove dead animals or plants on a regular basis if they begin to accumulate around the area. If geotechnical tests confirm the need In order to prevent this from becoming an issue, you should take measures such as adding additional aeration devices and removing any excess plant growth so that the water is not allowed to become stagnant over time. pathways are provided by using multiple cells, longer flowpaths, high surface The entire pond perimeter may be retaining walls, however, it is recommended that at least 25 percent of the pond perimeter be a vegetated soil slope not steeper than 3H:1V. Because the water in retention ponds provides a safe haven for fish, birds, insects, reptiles, and amphibians. buffers). Good design and adequate maintenance are likely to improve the ability to achieve high efficacy in pollutant removal.
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