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Wisconsin Mound
Onsite Wastewater Demo Project- Wisconsin Mound
The mound system was originally developed by the North Dakota Agricultural College in the 1940's and was known as the Nodak Disposal System. In 1976, the small scale Waste Management Project at the University of Wisconsin began a study of mound systems. In 1979, the project issued a design manual describing site conditions and design criteria for mounds. Ongoing research and monitoring of mounds has lead to further refinement of the location and design criteria. In 1990 an updated mound manual was released and a 2000 manual is scheduled for release later this year.
Onsite Wastewater Demo Project- Wisconsin Mound |
The Wisconsin Mound System
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Wisconsin mounds were developed in the United States in the 1970's as a system designed to treat and dispose of human wastewater in areas identified as generally unsuitable for conventional septic tank and soil absorption systems. Over the years the design of the mound has been modified and improved to the present design that if sized and installed correctly is capable of appropriately disposing of domestic wastewater in a number of locations within the Port Stephens Local Government Area that have specific site limitations making them unsuitable for conventional systems.
Mounds are pressure-dosed sand filters constructed above the natural ground surface and discharge indirectly to the natural soil. Their main purpose is to provide additional treatment to domestic effluent that has already undergone either primary treatment in a septic tank or secondary treatment in a secondary treatment system. Mound systems are designed to overcome site restrictions such as:
* Highly permeable soils (sands);
* Slowly permeable soils (clays);
* High groundwater tables;
* Shallow soil cover over creviced or porous bedrock.
The Wisconsin Mound System |
WISCONSIN MOUND SOIL ABSORPTION SYSTEM: SITING, DESIGN AND CONSTRUCTION MANUAL
The Wisconsin mound wastewater soil treatment system was developed in the 1970s to overcome some limitations of in-ground trench and bed units and the Nodak system (Witz, 1974). The objective of the mound, as with other soil-based units, is to treat and disperse domestic and commercial wastewater on-site via subsurface in an environmentally acceptable manner and to protect the public health.
The Wisconsin mound has been widely accepted and incorporated in many state and local regulations. In 1980 it was incorporated into the Wisconsin Administrative code. Mound technology was successfully implemented in Wisconsin partially because of an extensive educational program offered during the introduction of the mound concept. For the mounds to
continue as a viable "tool" in treating and dispersing on-site wastewater, the soil evaluator, designer, installer, regulator and manager must understand the principles of operation, design, installation and management of the system.
WISCONSIN MOUND SOIL ABSORPTION SYSTEM: SITING, DESIGN AND CONSTRUCTION MANUAL |
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