What is the equation to find the gallons of chemical required per CFS?

The equation to find the gallons of chemical required per cubic foot per second (CFS) is crucial for ensuring the correct dosage of chemicals in aquatic pest management. The correct choice integrates the relevant factors—parts per million by volume (PPMV), the duration in minutes that the chemical is applied, and a conversion factor.

The chosen formula incorporates PPMV, which represents the concentration of the chemical needed for effective pest control. By multiplying PPMV by 450, a conversion factor based on the specific weight of water (considering the density of a gallon and volume conversions) is included to help translate the concentration into a practical application quantity. Dividing by 1,000,000 adjusts the result from a micro-scale into a usable gallon metric, providing a straightforward method for determining the chemical amount needed over a specific time period.

In contrast, the other options either misrepresent the relationship between the parameters or fail to correctly incorporate conversion factors necessary for the context of chemical application in aquatic environments. Therefore, option A accurately represents the necessary calculations to ensure that the proper quantity of chemical is calculated based on flow rates and desired concentration levels.