Drawdown is best described as which practice?

• A. Lowering water in a pond to expose near-shore sediments; most effective in winter when plants are exposed to freezing temperatures
• B. Raising water level to submerge sediments
• C. Draining a pond completely in summer
• D. Using chemical treatments to reduce water volume

Answer: (A)

The practice tested here is about lowering the water level of a pond to expose the near-shore sediments. By reducing the depth, shallow zones, where many aquatic pests and their overwintering stages reside, become exposed to harsher conditions. Doing this in winter leverages freezing temperatures to stress or kill organisms and slow vegetation growth, making subsequent control efforts easier and more effective without chemicals.

Raising water to submerge sediments, draining a pond completely in summer, or using chemicals to reduce water volume describe actions that aren’t drawdown. Drawdown is specifically about the physical change of lowering water, not increasing water depth, removing all water, or applying chemicals.