Observed arrival · 2026-11-08
A Roof-to-Cistern Calculator for 3,206 U.S. Cities
A city-and-roof calculator estimating monthly rain capture, suggested barrel or cistern capacity, and state storage rules.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- Homeowners sizing rain barrels or cisterns
- Worth noticing
- Its city pages use rainfall from the nearest NOAA station, and the index spans 3,206 U.S. cities.
Field notes
The homepage pairs a roof-footprint input with a city lookup, then presents normal monthly rainfall, estimated roof catch, a suggested barrel or cistern size, and state storage rules. Its index covers 3,206 U.S. cities, using rainfall from the nearest NOAA station; examples contrast Seattle’s 30,560 gallons and 165 gallons of storage with Phoenix’s 6,732 gallons and a 1,500-gallon cistern. The page does not specify the calculation assumptions behind those estimates.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
One card from the complete issue