Regarding the site selection, a number of factors determine the suitability of a site for rainwater infiltration:

• Vegetative cover: Rainwater can be absorbed by plant roots and can be returned to the atmosphere through plant respiration. The soil-vegetation complex functions to a certain degree as a filter that reduces clogging of the surface pores of the soil.

• Soil type and conditions: Effective porosity and permeability are soil parameters that influence the infiltration process. Bedrock should not be within less than 1.2 meters of the infiltration surface.

• Groundwater conditions: Distance to groundwater and variation in groundwater levels are some of the information needed for planning infiltration facilities. It is recommended that the distance to groundwater is at least 1 meter.