150,000 cubic feet of storage, while the highest is approx. Retention ponds are beneficial because they enhance water quality and provide new habitats but they can also pose a risk of drowning. Take, for example, the Blue Dog Pond located in Seattle, WA (pictured above). The construction of a retention pond can range from USD 35,000, to USD 1,000,000 depending on the size and modifications made to the pond. They dry out between storms because they have an orifice at the bottom through which the water can flow. The main difference between a detention basin or retention basin, is the presence or absence of a permanent pool of water, or pond. Keeping up with maintenance can reduce costly repairs in the future. . So, in conclusion, both ponds will effectively manage stormwater. PDF Module 19: Treatment Ponds and Lagoons - Department of Environmental Despite the lack of aesthetic qualities, detention ponds are much better at providing flood protection to their locality, than retention ponds. ?N(xumN*hj"YE;Rrdnlw@yGsG-gF+;,uI1$wHXp p:F2!=(&f8ncp[)=M&l/Q{*y}3I:n_\$7mdMTQ5y0 dCTydxdZev.$lXlU,Tb\Y2Je.oO~l'?K,m?$UaStNq\5ex6#%u:@]<6UKNMTSEQ'r\!d Nw $oC_5{2 gJw} ;Y %?V9GZwe;1kOslpt )G ch;u!aOazinwS5*+_>$(9SFI5|&hv4T93~12w!)_W]V3q Wp(i{8SP#S-Bjm%@=!>x$!^>a? 4 ["[.\%G ?/ 6;C ETL!vcFmTVtA&FzX-Z8o$],U4&_e>sODEd\AG|:H77Aq>zQ`mc +tJoA2{X>Z:#+hh+p! z This helps prevent runoff from flooding in and out of rivers and streams and overflowing the sewer systems. Stormwater runoff occurs when roads, sidewalks, and other developments cannot absorb water like the natural ground can, causing the water to start flowing. A retention pond can also provide some water quality benefits by reducing pollutants and sediments. Inlets, outlets & control structures overview, National Standards for Sustainable Drainage, Flexible infrastructure/climate change adaptation, Good removal capability of urban pollutants, Can be used where groundwater is vulnerable, if lined, High potential ecological, aesthetic and amenity benefits, Anaerobic conditions can occur without regular inflow, Land take may limit use in high density sites, May not be suitable for steep sites, due to requirement for high embankments, Colonisation by invasive species could increase maintenance.
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