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Volumetric Flux

gfdtocm/hr

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

Factor1 gfd = 0.16977 cm/hr

Converter

gfd

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

Result
16.977cm/hr

Rendered to 6 significant figures.

Formula

Formula
cm/hr = gfd × 0.16977

Multiply any value in US gallons per square foot per day by 0.16977 to obtain the value in centimetres per hour (volumetric flux).

Worked example

Convert 100 gfd to cm/hr.

  1. 01Start with 100 gfd.
  2. 02Multiply by the conversion factor: 100 × 0.16977 = 16.977 cm/hr.
Result100 gfd = 16.977 cm/hr

Conversion table

gfdcm/hr
10.16977
20.33954
50.84885
101.6977
203.3954
508.4885
10016.977
20033.954
50084.885
1000169.77

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from gfd to cm/hr?
1 gfd equals 0.16977 cm/hr. To convert, multiply the value in US gallons per square foot per day by 0.16977.
How do I convert 1 gfd to cm/hr?
1 gfd = 0.16977 cm/hr. For any value, multiply by 0.16977.
How do I convert cm/hr back to gfd?
Divide by the same factor — or equivalently, multiply by 5.890322. So 1 cm/hr = 5.89032 gfd.
When would I need to convert US gallon per square foot per day to centimetre per hour (volumetric flux)?
Volumetric-flux conversions between gfd and cm/hr 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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