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Boards hears lakes‑management updates: nutrient study proposal, invasive‑plant treatments and citizen cleanup results
Summary
Staff reported on a proposed Orange County nutrient study (a prerequisite for alum treatment), announced spot treatments for hydrilla and water hyacinth, and noted volunteers removed about 320 pounds of trash during a recent paddleboard cleanup.
City lakes staff updated the Lake Killarney Advisory Board on July 1 about planned monitoring and management work, including an Orange County nutrient‑study proposal, targeted invasive‑plant treatments and recent volunteer cleanup results.
Staff told the board the county advisory group requested a proposal be submitted for an upcoming nutrient study that must be initiated before any alum treatment may be considered. Staff said the county will be involved in measuring inlets and considering additional curb‑inlet baskets in the Orange County portion of the watershed; any technical study findings will be shared with the advisory board when available.
The board also heard a lakes management briefing covering water‑quality metrics through March 2026 (phosphorus, nitrogen, clarity and TSI) and upcoming treatment work. Staff reported that spot treatments for hydrilla are planned and that water hyacinth has spread in the canal and on the lake’s south shore; foliar (spray) treatment with a contact herbicide will be used and dead plant material typically breaks down and sinks over days, staff said.
Staff credited volunteers for removing roughly 320 pounds of trash at a recent paddleboard cleanup and thanked participants. “Thank you to all the volunteers that came out and participated and helped out,” staff said.
Chair Jeanne Wall asked the board to add a presentation to the next meeting about a recently funded 'nano bubbler' system installed on Lake Virginia; staff said the city received approximately $2,000,000 in grant funding for that project and agreed to provide links and materials in the next packet so the advisory board can learn more.
No formal decisions on nutrient study contracts or treatment scope were made; staff will distribute the county materials and present study results or recommendations when they become available.
