SU0009004 - Laserfiche WebLink

Home Browse Search

❑ Contact the local mosquito control program for advice with problem systems. Stormwater Treatment Ponds and Constructed Treatment Wetlands ❑ Whenever possible, stock stormwater ponds and constructed wetlands with mosquito-eating fish available from local mosquito control programs. „„ ;ice. . � __• v-: "' tC�i r Design and maintain accessible shorelines to allow for periodic maintenance and/or control of emergent and shoreline vegetation, and routine monitoring and control of mosquitoes. Emergent plant density should be routinely managed so mosquito predators can move throughout the vegetated areas and are not excluded from pond edges. ❑ Whenever possible, design and maintain deep zones in excess of four feet (1.2 m)to limit the spread of invasive emergent vegetation such as cattails. The edges below the water surface should be as steep as practicable and uniform to discourage dense plant growth that may provide immature mosquitoes with refuge from predators and increased nutrient availability. ❑ Use concrete or liners in shallow areas to discourage plant growth where vegetation is not necessary. ❑ Whenever possible, provide a means for easy dewatering if needed. ❑ Manage the spread and density of floating and submerged vegetation that encourages mosquito production (i.e., water hyacinth, water primrose, parrot's feather, duck-weed,-and-filamentous algal mats).. ❑ If possible, compartmentalize managed treatment wetlands so the maximum width of ponds does not exceed two times the effective distance (40 feet [12 m]) of land-based application technologies for mosquito control agents. General Access Requirements for Stormwater Treatment Structures ❑ All structures should be easily and safely accessible, without the need for special requirements (e.g., Occupational Safety and Health Administration - OSHA - requirements for "confined space'). This will allow for monitoring and, if necessary, abatement of mosquitoes, ❑ If utilizing covers, the design should include spring-loaded or lightweight access hatches that can be easily opened. 3