EVMWD may consider using Canyon Lake as an Water quality in the lake environmental buffer to allow for potable reuse of may limit the amount of advanced treated reclaimed water. Advanced Wastewater Reduction of TP and reclaimed water that can be Canyon Lake Treatment (AWT) water would be discharged at the TN in water column; diverted for potable supply. Indirect Potable Hydrologic Internal (Main/East $$$$ upstream end of the lake to maximize residence time flushing of nutrients Operation of the system Reuse flushing Bay) prior to reaching the drinking water treatment plant and phytoplankton out during the wet season may intake. AWT water would serve to dilute ambient water of Canyon Lake be less reliable given water in the lake as well as create additional flushing of water quality and capacity when overflows are not occurring. limitations. Lake Establishment of submerged aquatic vegetation that will Macrophytes may not get Reduction of TP and Elsinore, take up nutrients and release oxygen to the water established. Vegetation TN in water column, Algae control Internal Canyon Lake $$ column. Macrophytes can compete for limited nutrients Water level fluctuations can Management control of algae (Main/East and light with algae thereby providing another control on kill vegetation by either growth Bay) algae growth. desiccation or drowning. Sonication is effective over a area and may require too many devices to impact Ultrasonic Canyon Lake Devices can be deployed that will kill algae within a Control of algae Algae control Internal $ larger zones. Algae Control (East Bay) radius by sonication growth Impact to other aquatic species could become an important consideration Repeated use of some algaecides can cause elevated levels of toxins in Canyon Lake Algaecides may be effective in controlling algae blooms Control of algae the lake bottom Algaecide Algae control Internal (Main/East $ as they begin to occur growth Nutrients are not addressed Bay) and therefore new blooms may arise shortly after an algaecide treatment Lake intensive Elsinore, Nutrients are not addressed Physical Skimmers and tools can be used to physically Control of algae Algae control Internal Canyon Lake $$ and therefore new Harvesting remove algae from the surface of the lake growth (Main/East blooms may arise shortly Bay) after physical removal
Indirect Potable Reuse Hydrologic flushing Internal Canyon Lake (Main/East Bay) $$$$ EVMWD may consider using Canyon Lake as an environmental buffer to allow for potable reuse of advanced treated reclaimed water. Advanced Wastewater Treatment (AWT) water would be discharged at the upstream end of the lake to maximize residence time prior to reaching the drinking water treatment plant intake. AWT water would serve to dilute ambient water in the lake as well as create additional flushing of water when overflows are not occurring. Reduction of TP and TN in water column; flushing of nutrients and phytoplankton out of Canyon Lake Water quality in the lake may limit the amount of reclaimed water that can be diverted for potable supply. Operation of the system during the wet season may be less reliable given water quality and capacity limitations. Vegetation Management Algae control Internal Lake Elsinore, Canyon Lake (Main/East Bay) $$ Establishment of submerged aquatic vegetation that will take up nutrients and release oxygen to the water column. Macrophytes can compete for limited nutrients and light with algae thereby providing another control on algae growth. Reduction of TP and TN in water column, control of algae growth Macrophytes may not get established. Water level fluctuations can kill vegetation by either desiccation or drowning. Ultrasonic Algae Control Algae control Internal Canyon Lake (East Bay) $ Devices can be deployed that will kill algae within a radius by sonication Control of algae growth Sonication is effective over a area and may require too many devices to impact larger zones. Impact to other aquatic species could become an important consideration Algaecide Algae control Internal Canyon Lake (Main/East Bay) $ Algaecides may be effective in controlling algae blooms as they begin to occur Control of algae growth Repeated use of some algaecides can cause elevated levels of toxins in the lake bottom Nutrients are not addressed and therefore new blooms may arise shortly after an algaecide treatment Physical Harvesting Algae control Internal Lake Elsinore, Canyon Lake (Main/East Bay) $$ Skimmers and tools can be used to physically remove algae from the surface of the lake Control of algae growth intensive Nutrients are not addressed and therefore new blooms may arise shortly after physical removal
Section-7_Implementation_Draft120417.docx