Fisrtly you need to ...
Published by PHETLA MANGENA, Water quality at WEB Bonaire
Fisrtly you need to determine the number of student and the following as well:
The size of the trench/pit.
Create pit into phases (i.e. Primary, Secondary and tertiary process.
The unrine need to follow from primary to Secondary.
The secondary phase must have the filter media according to size is where convention will started.
There after at tertiary is where, urine will get treated before it can discharge to the environment.