Natural Treatment Systems as Sustainable Ecotechnologies for the Developing Countries

Table 4

Design features of terrestrial treatment system.

Feature	Slow rate	Rapid infiltration	Infiltration	Overland flow
Soil texture	Sandy loam	Sand and sandy	Sand to clayey, silty, loam, and clay loam	Clayey loam
Depth to	3 ft	3 ft	3 ft Not critical	Groundwater
Vegetation	Required	Optional	Not applicable	Required
Climatic restrictions	Growing season	None	None	Growing season
Slope	<20%, Not critical	Not applicable	2%–8% slopes cultivated land	<40%, uncultivated land

[179].