PIPES, DUCTS OR CIRCULAR SECTON
One side of the calculator solves the rational formula for water flow in pipes and ducts of circular section. The answers have been checked against a large number of well authenticated practical tests on actual pipelines from small metal tubes to long concrete tunnels up to 6 metres dia. and give accuracy appreciably better than the usual Hazen Williams formula.
Flow 0,1 l/s to 100 m3/s Diameter 16 to 6.300 mm
The reverse side solves the Manning formula for the flow in open channels.
Flow 15 l/s to 1.500 m3/s
Channel Area 0,07 to 200 m2
Imperial, Metric or U.S.
Two sided, 3 colour
Velocity scales have been added to both sides of the calculator.
Complete in case with full instructions