8,255
edits
Changes
Jump to navigation
Jump to search
Line 22:
Line 22: + Line 27:
Line 28: − *When \(0.33<Y_{0.05}/D_{0.05}<0.7\), the storage volume required can be estimated:+ Line 37:
Line 38: − +
Rainwater harvesting: Sizing and modeling (view source)
Revision as of 13:47, 17 August 2017
, 6 years ago→Simple
*''P<sub>d</sub>'' = The daily demand per person (L)
*''P<sub>d</sub>'' = 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:
<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'' = The efficiency of the pre-storage filter.}}
*''e'' = The efficiency of the pre-storage filter.}}
*Careful catchment selection means that the runoff coefficient, for a rainstorm event (C<sub>vol, E</sub>) should be 0.9 or greater.
|*Careful catchment selection means that the runoff coefficient, for a rainstorm event (C<sub>vol, E</sub>) should be 0.9 or greater.
When 0.33 < Y<sub>0.05</sub>/ D<sub>0.05</sub>< 0.7, the total storage required can be estimated by adding Y<sub>0.05</sub>:
When 0.33 < Y<sub>0.05</sub>/ D<sub>0.05</sub>< 0.7, the total storage required can be estimated by adding Y<sub>0.05</sub>: