Changes

*''P_d'' = The daily demand per person (L)

*''P_d'' = The daily demand per person (L)

*''n'' = The number of occupants}}

*''n'' = The number of occupants}}

Then the following calculations are based upon two criteria:

Then the following calculations are based upon two criteria:

#The average annual demand (D) is greater than the average annual yield (Y) from the catchment.  

#The average annual demand (D) is greater than the average annual yield (Y) from the catchment.  

*When \(0.33<Y_{0.05}/D_{0.05}<0.7\), the storage volume required can be estimated:

When \(0.33<Y_{0.05}/D_{0.05}<0.7\), the storage volume required can be estimated:

<math>V_{S} = A \times C_{vol,E}\times R_{d} \times e</math>

<math>V_{S} = A \times C_{vol,E}\times R_{d} \times e</math>

Where:

Where:

*''e'' &#61; The efficiency of the pre-storage filter.}}

*''e'' &#61; The efficiency of the pre-storage filter.}}

*Careful catchment selection means that the runoff coefficient, for a rainstorm event (C_{vol, E}) should be 0.9 or greater.

|*Careful catchment selection means that the runoff coefficient, for a rainstorm event (C_{vol, E}) should be 0.9 or greater.

          

          

When 0.33 < Y_0.05/ D_0.05< 0.7, the total storage required can be estimated by adding Y_0.05:

When 0.33 < Y_0.05/ D_0.05< 0.7, the total storage required can be estimated by adding Y_0.05: