Ponds Can Be Hazardous
A Yale University study has concluded that small ponds that collect stormwater runoff are the source of about 15 percent of carbon dioxide emissions from inland waters.
The ponds also cause about 40 percent of methane emissions, according to the study. As collected material rots and decomposes, gases are released into the air. Algal blooms and sediment buildup are additional potential issues.
In some areas, man-made ponds have become the standard for sequestering pollutants that otherwise would run into the waterways. Unfortunately, if they are not designed properly, the ponds are also a biohazard waiting to happen, according to the study. The buildup of toxic sediment makes the ponds tougher to handle and makes for a high-dollar hazardous-substance removal job.