It’s easy to assume that excavation is the most challenging part of building a small to medium sized pond. However, a properly shaped and compacted pond will still lose water and cost too much money to keep filled unless it’s lined.
Retention ponds are often as simple as holes dug in low lying dirt areas but can also reach high levels of complexity with multiple compartments, advanced filtration systems, and extensive overtopping protection for floods.
Before you install any old pond liner you can find in your new algae ponds, check out the material. Many pond liners, even those that are fish-safe and plant-safe, feature algaecide treatments to control the growth of these tiny plants.