What is recommended when starting operation of ponds?

• A. Start with 1 ft regulated water
• B. Start with full depth water
• C. Maintain pH below 7
• D. Do not remove scum

Answer: (A)

Starting up ponds should be done gradually, beginning with a shallow water depth. Filling to about a foot of water at the start gives a controlled environment where the microbial populations can begin to acclimate and the influent impact can be monitored without overwhelming the system. With this lighter load, it's easier to observe how the pond responds, identify any issues with inflow, leaks, or scum formation, and manage odors as the biological processes begin to establish themselves. Once performance looks stable, you can progressively raise the water to the designed operating depth.

Filling to full depth right away can shock the system, making it harder for treatment processes to adapt and increasing the risk of odor, poor settling, and uneven performance. Keeping the pH below 7 is not desirable for pond biota, which typically perform best around neutral to slightly alkaline conditions. Not removing scum in the startup phase can lead to buildup that interferes with mixing and contact time, so starting with a controlled depth helps keep operations manageable as the pond stabilizes.