the waste waters purified by ...

the waste waters purified by the process “Biological Pit “lyseconcept rejects a water fertilizing and enriching for the topsoil. dispersed this water supports the development of biodiveristé of surface. but as it contains fine organic matter particles in suspension it changes the nature of the ground. two examples: on a clay soil a 5 m thickness of depth the red ground clay became slightly gray on the surface. while digging slightly one sees the change of the ground. a sandy ground (sand of sea which for a long time does not have any more any salinity) became a topsoil. the two examples are different origins. one is made by the process “Biological Pit " lyseconcept, the other is done by the market-gardener who uses a special method of fertilization of his soil. In both cases I approached problematic “the flood” and in both cases it was tell to me that water disappeared more quickly on the clay soil and that at the time of the strong rains flooding in the other case its soil was maintained. I believe it because the vegetable biodiversity by purifying the ground penetrates that Ci with its roots and supports the infiltration of rainwater. it is logical. more one supports the vegetable biodiversity more one will dig the ground and water will infiltrate more quickly. in urban area these are trees that it is necessary to plant.