Project data  

Export to  Open Know How Manifest 
Device data 

Page data  

Part of  WaterPod 
Type  Project, Device 
Keywords  Rainwater, water, rainwater catchment, rainwater collection, rainwater calculations 
Sustainable Development Goals  SDG03 Good health and wellbeing 
Published by  Lonny Grafman 
Published  2009 
License  CC BYSA 4.0 
Automatic translations  Français, Español, 中文, العربية, Русский, Kiswahili and others 
Cite as Lonny Grafman (2009). "WaterPod rainwater calculations". Appropedia. Retrieved 20210725. 
Location data  



Location  New York 
The WaterPod will be collecting rainwater from a few of the impermeable roof areas. The calculations for collection are on this spreadsheet. There are three tabs feeding the results:
 Tab:Collection Calcs  Calculates the monthly availability of the rainwater.
 Tab:Collections Dimensions  Calculates the available rainwater collection area based upon the planned structures.
 Tab:Regional Climate Data  Show monthly rainfall from historical averages. Could be made more current.
Regional Climate Data[edit  edit source]
The historical 1971  2000 Rainfall Normals for Central Park, New York[1] are:
Jan  Feb  Mar  Apr  May  Jun 
3.42  3.27  4.08  4.2  4.42  3.67 
Jul  Aug  Sep  Oct  Nov  Dec 
4.35  4.01  3.89  3.56  4.47  3.91 
Annual  
47.25 
Basic Calculation[edit  edit source]
[math]\displaystyle{ Collection\ Volume (gal) = Rainfall\ (in) \times \frac{1 ft}{12 in}\times Collection\ Area\ (ft^2) \times \frac{7.48 gal}{ft^3} \times Roof\ Coefficient \times Efficiency }[/math]
or
[math]\displaystyle{ V=R \times A\times k \times e }[/math]
(in some cases the efficiency of the system is assumed to be 100% and therefore equal to 1, having no effect on the rest of the equation.)
Click here for more detailed rainwater collection calculations and explanations.
Conclusion[edit  edit source]
Wait until the spreadsheet is finalized before posting the final conclusions here.