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Water moves through 6 ft² of channel area at 1.5 ft/s. What is the flow in gpm?

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3,366 gpm4,039.2 gpm1,795.2 gpm2,692.8 gpm

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Curated open-channel values teach the governed area, velocity, and flow relationships. They are not channel-design criteria, acceptable velocity ranges, pipe-sizing guidance, pump recommendations, operating targets, certification weighting, or claims about a specific collection system.

This Draft family uses selected mathematical facts only. It does not reproduce an official formula sheet or claim Washington exam weighting.

Printed page 3 of 10, Flow Rate, ft³/sec: Area, ft² × Velocity, ft/sec
Printed page 6 of 10, Velocity, ft/sec: Flow Rate, ft³/sec ÷ Area, ft², or Distance, ft ÷ Time, sec
Printed page 8 of 10, Abbreviations: cfs, ft, gpm, Q, and sec
Printed page 9 of 10, Conversion Factors: 1 cubic foot per second = 448.8 US gallons per minute
Printed page 9 of 10, Conversion Factors: 1 cubic foot per second = 0.646 million US gallons per day
Printed page 4, Units for Calculations and Exam Content Outline; printed pages 6, 8, and 9, calculation-item counts in equipment, collection-system, and lift-station content areas