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<br />... .. <br /> <br />Retention~S~tems <br />- W'erponds <br /> <br />. Can increase adjacent property values when planned, sited and designed properly. <br />. Pond sediment removal schedule is generally less frequent than for other BMPs. <br /> <br />Limitations <br /> <br />. Generally not prescribed for drainage areas. smaller than 10 acres. <br /> <br />. More costly than extended storage ponds. <br /> <br />. Requires relatively large land area. <br /> <br />. Improperly designed or maintained ponds may result in stratification and anoxic conditions that can promote <br />the release of nutrients and metals from the trapped sediments. <br /> <br />. Discharges from ponds usually consist of warm water, and thus pond use may be limited in areas where warm <br />water discharges from the pond will adversely impact a cold water fishery. <br /> <br />Maintenance access <br />around pond <br /> <br />,"* - --...... <br /> <br />"w ":"...... <br /> <br />.. <br />.- <br />" . <br />" . <br />, . <br />'/'..... . <br />, . <br />, . <br />. ... - . ~ ~, <br />MaXImum safety .. " 1" . . . .( . . <br />storm limit ' . .... ~ . . . . . ; : :.' ~ Pond buffer 33 feet Il1Immum <br />..--"'" <br />Maximum extended <br />detention limit <br /> <br /> <br />, .' <br /> <br />... <br /> <br />Figure 2: Schematic of a Wet Pond Showing Aquatic and Safety Benches <br />Source: Schueler, 1987 <br /> <br />Metropolitan Council! Barr Engineering Co. <br /> <br />3.255 <br /> <br />1_-- . . ... <br />