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Emgine Pressure
NP + FL +/ Head + Appliance

Net Pump Pressure
Hydrant = EP  Intake Pressure
 Drafting = EP + Pressure Correction (^{Feet of Lift + FL})
 ^{2.3 }

2 (Q) ^{2 }x L
 Q = Quantity of water flowing
 L = 100' Lengths of 2 ^{1/2 }Hose

Volume of a Cylinder
.7854 x D^{2} X H or L = Cubic Feet
D^{2} 6L = Gallons

Pressure at the bottom of a container
Height x .5 = Pressure (Field)
Height x .434 = Pressure (True)

Pressure at the bottom of a container
*PSI are given
PSI @ bottom x 2.304 = Height

Fire Flow Solid Stream
29.7 x D^{2} x Square Root NP = GPM
30 x D^{2} x Square Root NP (Field) = GPM

Fire Flow Solid Stream (Open Butt)
29.7 x D^{2} x Square Root NP x .9

Nozzle Reaction Solid Stream
1.5 x D^{2} x NP
True = 1.57 x D^{2} x NP

Nozzle Reaction Fog Stream
.5 x GPM
True = .0505 x GPM x Square Root NP

Round Pools
(Amount in Gallons)
3.14 x R^{2} x D x 7.5

Square / Rectangular Pools
(Amount in Gallons)
L x W x D x 7.5