Problem:
A rainwater harvesting system will be installed on a house with a catchment surface of 140 m2.
Required:
a. Size a first flush diverter for the rainwater harvesting system.
b. Assuming that the unit will divert its full volume during each rainfall, and on average there are 38 rainfall events each year, how much water will be diverted away from the storage tank?
Note: Please show how to work it out.