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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A mound system is an alternative to the traditional rural septic system leach field. The mound system is an engineered leaching field used in areas where septic systems are more prone to failure due to having extremely slow or extremely fast permeable soils, soil with shallow cover over porous bedrock, and soils that have high seasonal water table. The primary waste liquids cleaning and purification action in a leaching field is performed by a biofilm in the loose fill surrounding the perforated drain tile. If the soil permeability is too low, liquid is not absorbed fast enough, resulting in surface ponding of unsanitary liquids. If the soil permeability is too high, or is exposed fractured bedrock, the wastewater quickly penetrates down to the water table before the biofilm has time to purify the water, leading to contamination of the aquifer. In either situation, the mound system provides an ideal habitat for the biofilm and has the correct balance of permeability to assure slow absorption of effluent into the mound before exiting as purified water into the surrounding environment.
0.22 x 0.15 x 0.005 m; 0.116 kg