At-Grade systems- Advantages and Disadvantages

Different methods of waste water treatment are used in different places depending on the soil and other factors. There are sites with soils either so deep that it is difficult to use a mound or so shallow that it is also difficult to use a below grade soil absorption system.

A properly designed and installed at-grade system can last for several years with a few simple maintenance procedures. The treatment unit and pump chamber should be operated and maintained properly. The septic tank should be checked for sludge and scum buildup regularly and pumped as needed. The effluent filter should also be removed and cleaned when necessary. There is minimal maintenance required for at-grade systems. All surface water and roof drainage should be diverted around it to reduce the possibility of failure to the system. The laterals should be flushed annually at the minimum. Also the at-grade system should be checked for some conditions like ponding in the absorption area, seepage out of the side or toe, spongy areas developing on the side, top or toe and clogging of the distribution system.

The advantages of the at-grade system are that this system enables the use of land that is unsuitable for conventional trenches and exceed the criteria for the mound system. This system is also less costly than a mound as there is no need of the costly C33 sand. The natural soil is generally the top layer which is typically the most permeable. There is little excavation required in the absorption area and hence the construction damage can be minimized. These systems can also be used in all the climates.

Special care must be taken to see that the top permeable topsoil is not damaged. The disadvantage of the system is that its location might affect drainage patterns and limit land use options. There is also a need for electricity and mechanical equipment.

[url=http://www.jairajbuilders.com/]Kerala builders[/url] are seriously considering this option for their projects due to its many advantages.