Proposes a dimensionless quantity that combines volume flow rate q, density p viscosity u of the fluid, and depth h.

Explanation:

First, we need to establish the unit of each variable:  

To eliminate we need to multiply Q by . Then to eliminate kg we divide by . Finally, multiply by h we can let the constant dimensionless.

c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.