The section of the book on the processing of wastewater via an artificial marsh intrigued me to do some more research. There are two types of constructed wetlands: the subsurface - flow wetland and the surface - flow wetland. The subsurface - flow wetland transports sewage sludge through the sand to the roots of the marsh plants, while the sewage sludge in the surface - flow wetland travels above the soil. Also, there are many wetlands here in San Diego County, some of which are 'constructed' and not natural. However, the population in San Diego County is too large to have the wetlands serve as biological treatments for wastewater and sewage, which is why they were created mostly to serve as a refuge for migrating birds and to compensate lost estuarine habitat. Here is a list of the wetlands in San Diego County if anyone is interested.
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