Question: What is the difference between
Cubic Feet per Second (CFS
), Acre Feet (AF
), and Gallons (G
Answer: When discussing volumes of water, such as amount applied to land, reservoir storage capacity, or monthly/yearly consumption, the most common terms used are Acre Feet (AF)
. When referring to a rate to be diverted, the terms commonly used are Cubic Feet Per Second (CFS) or Gallons Per Minute (GPM). Permits/Certificates for water use specify the appropriate measurement to use when providing information to the Department.
For rights authorizing less than 0.1 cfs or 9.2 acre-feet, you may assume the maximum quantity allowed under the right and report that volume. For reporting purposed, please convert cubic feet per second to acre feet, using (1.98) x (CFS) x (# of day used per month). Both the online utility and the water use report form provide you the option of reporting your monthly usage as one of the following: Acre Feet (AF), Gallons (G), Thousand Gallons (KG), Million Gallons (MG), Cubic Feet (CF), or Million Cubic Feet (MCF).
1 Acre Foot (AF) = 325,851 Gallons (G)
1 Acre Foot (AF) = 43,560 Cubic Feet (CF)