These are wetland type leach fields. Plant life decomposes the waste, cleaning it, and then filters it back into the environment. This is more natural, more condusive to the environment.Many have liners or cells underneath it all. Bacteria in the tank decomposes the solids. Only the already broken down liquid is piped to the wetland area, for further cleansing, before it releases back to nature through evaporation.
The tank does it's job, and then, instead of leaching into pipes buried under 800 yards of sand it would leach into this controlled wetland area.








Now the coyote, well...that's another thing.