This document on septic tanks gives guidelines on how to design and make a system.
OXFAM (2008): Septic Tank Guidelines. (= Technical Brief ). Oxford: OXFAM URL [Accessed: 08.04.2014]This document on septic tanks gives guidelines on how to design and make a system.
OXFAM (2008): Septic Tank Guidelines. (= Technical Brief ). Oxford: OXFAM URL [Accessed: 08.04.2014]