Septic tank systems

Textual description

This figure outlines a decision tree for a septic tank system. Has a site evaluation been carried out by a suitably qualified and experienced person? If not, obtain specialist advice. If yes, does the evaluation indicate prohibition of human waste discharge? If so, is a containment system applicable? If not, does the site evaluation indicate any site limitations? If not, does the soil drain poorly? Does ground cover preclude subsurface disposal? If so, seek specialist advice. If not, Is the depth for the seasonal watertable greater than 1200mm with no limiting intermediate horizons? If not, seek specialist advice. If so, does the ground surface slope less than 20 degrees? If not, seek specialist advice. If so, does the soil drain rapidly? If so, seek specialist advice. If not, use the sub surface land application method.