Bioretention ponds are essentially a sophisticated feature of rain gardens. Not every rain garden needs a bioretention zone. Many rain gardens can exist in blissful simplicity. But on sites with serious drainage issues, large quantities of water, it may be necessary to do some excavation work. Layers of different sized strata help with drainage beyond the native wetland plant water metabolism power.
As we’ve said before: “Rain gardens are the future of stormwater management. Imagine a system that harnesses nature to re-engineer a site to capture and sequester toxic runoff before it even starts. And habitat restoration with native plants for butterfly + pollinator gardens are part of the package? Rain gardens are the answer to many of the “wet soil problem area” questions.” Bioretention zones become a necessary part of the planning when a site has standing water for more than 7 days as a regular occurrence.