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Volumetric Flux

gfdtocm/s

Convert US gallons per square foot per day (gfd) to centimetres per second (volumetric flux) (cm/s).

Factor1 gfd = 4.715833e-5 cm/s

Converter

gfd

Accepts numbers or expressions, e.g. 150 + 14.7

Result
0.999992cm/s

Rendered to 6 significant figures.

Formula

Formula
cm/s = gfd × 4.715833e-5

Multiply any value in US gallons per square foot per day by 4.715833e-5 to obtain the value in centimetres per second (volumetric flux).

Worked example

Convert 21205 gfd to cm/s.

  1. 01Start with 21205 gfd.
  2. 02Multiply by the conversion factor: 21205 × 4.715833e-5 = 0.999992 cm/s.
Result21205 gfd = 0.999992 cm/s

Conversion table

gfdcm/s
14.7158e-5
29.4317e-5
50.00023579
100.00047158
200.00094317
500.0023579
1000.0047158
2000.0094317
5000.023579
10000.047158

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from gfd to cm/s?
1 gfd equals 4.715833e-5 cm/s. To convert, multiply the value in US gallons per square foot per day by 4.715833e-5.
How do I convert 1 gfd to cm/s?
1 gfd = 4.71583e-5 cm/s. For any value, multiply by 4.715833e-5.
How do I convert cm/s back to gfd?
Divide by the same factor — or equivalently, multiply by 21205.16. So 1 cm/s = 21205.2 gfd.
When would I need to convert US gallon per square foot per day to centimetre per second (volumetric flux)?
Volumetric-flux conversions between gfd and cm/s are routine in membrane filtration (RO, UF, MF, NF permeate flux), hydraulic loading specification, water-treatment design, hydrometallurgy and packed-bed column loading, and environmental engineering. LMH (L/m²/h) and gfd (gal/ft²/day) dominate membrane datasheets; m³/m²/h and m³/m²/day cover SI engineering ladders; m/day and cm/s appear as superficial velocity in hydromet and packed-bed work. Volumetric flux is the same physical quantity as superficial velocity (m³/m²/s ≡ m/s) but is kept distinct from the velocity and flow categories because the engineering intent is volumetric throughput per unit area, not bulk motion or total throughput.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).

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