Waterpod/Rainwater Calculations

Project data
Type
Authors
Location	New York
Status
Years
OKH Manifest	Download

Device data
Hardware license	CERN-OHL-S
Certifications	Start OSHWA certification

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

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

$C o l l e c t i o n V o l u m e (g a l) = R a i n f a l l (i n) \times \frac{1 f t}{12 i n} \times C o l l e c t i o n A r e a (f t^{2}) \times \frac{7.48 g a l}{f t^{3}} \times R o o f C o e f f i c i e n t \times E f f i c i e n c y$

or

$V = R \times A \times k \times e$

(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

Wait until the spreadsheet is finalized before posting the final conclusions here.

Page data
Part of	Waterpod
Keywords	Rainwater, water, rainwater catchment, rainwater collection, rainwater calculations
SDG	SDG03 Good health and well-being
Authors	Lonny
License	CC-BY-SA-3.0
Language	English (en)
Related	0 subpages, 0 pages link here
Redirects	WaterPod rainwater calculations, Waterpod rainwater calculations
Views	5 page views (analytics)
Created	April 1, 2009 by Lonny Grafman
Last edit	January 8, 2026 by MetadescriptionsBot
Cite as	Lonny (2009–2026). "Waterpod/Rainwater Calculations". Appropedia. Retrieved June 4, 2026.
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