Which type of weeds do we aim to drown using water level manipulation?

The focus of drowning weeds through water level manipulation primarily targets emergent weeds. Emergent weeds are rooted in the substrate yet extend above the water surface. By raising the water level, these weeds can be submerged, leading to their death due to lack of sunlight and exposure to water beyond their tolerance levels.

Emergent weeds, typically found in shallow water areas or marshy environments, depend on being above water for growth. Submerging them for extended periods disrupts their photosynthesis and overall health. Tools like water level manipulation serve as a practical and environmentally conscious method to control these invasive plants without the need for chemical herbicides.

While floating and submersed weeds also experience changes in water levels, drowning is not a viable method for their management. Floating weeds are typically affected by water currents and competition, while submersed weeds are often adapted to thrive underwater. Perennial weeds may benefit from other control methods that target their root systems, rather than simply manipulating water levels.