Wilmington began efforts in June to control some of the aquatic weeds at Greenfield Lake, city spokeswoman Malissa Talbert says.
Water levels at the lake were lowered while an herbicide was applied to kill aquatic weeds that cover much of the lake’s surface. Because the herbicide is made as a slow release agent, the process will take about two months, Talbert says.
The city previously used the same herbicide along with water circulation devices and grass carp to help control the aquatic weeds and improve oxygen levels.
“Water quality and aquatic weed problems at Greenfield Lake are largely because of stormwater runoff that flows into the lake. The pollution carried by runoff comes from the densely populated, 2,500-acre Greenfield Lake Watershed that includes a lot of hard surfaces such as parking lots and roads where rainwater can’t be absorbed into the ground,” Talbert says. “Most of the polluted runoff comes from the waste of pets and wildlife, fertilizers and yard waste such as leaves and grass clippings.”
Date posted: July 21, 2010
User-contributed question by:
Joseph Sigman and Debbie McCoy