35. Deduction #2
If your city's elevation rises by one mile,
you have bigger problems.
A 6' safety factor is patently unreasonable.
36. Deduction #2
Highest pressure recorded at Des Moines:
31.06"
Lowest pressure recorded at Des Moines:
28.70"
All-time pressure difference:
2.36", or 2.67 feet of water head
76. Credits
Gasoline vapor pressure:
http://www.chevron.com/documents/pdf/MotorGasTechReview.pdf
Iowa topographical map:
http://ortho.gis.iastate.edu/client.cgi?
zoom=900&x0=469163&y0=4653689&layer=ned_10m&action=pan&pwidth=600&pheight=450
Satellite photo of Earth:
NASA (public domain)
http://earthobservatory.nasa.gov/IOTD/view.php?id=78617&eocn=related_to&eoci=related_image
Hurricane photo:
NOAA (public domain)
Pump performance curves are the work and property of their respective manufacturers
(Gorman-Rupp, Patterson, and Wilo)
All other photos are original work by Brian Gongol