water wheel of a lake vegetation harvester

agriculture algae aquatic blooms canary choke clogging contaminate curlyleaf cut cutter cyanobacterial decompose dredge dredger environment eurasian fertilizer flea floating grass grate growth habitat harmful harvester herbicide humans hydrilla improve invasive lake life loosestrife man management marine microbes mussells native nature nitrogen nutrients overgrown overgrowth pesticides phosphorus phytoplankton pond protect provide public purple quality recreation reed resources restoration river rocks runoff sediment shoreline skimmer soil species spiny splash splashes trees vegetation water watermilfoil waters watershed waterwheel weeds wheel wildlife zebra