ADVANCED WATERWORKS MATHEMATICS

The converting (or cancelling) of units is the most important concept in waterworks mathematics. You may be working with million gallons, cubic feet, acre feet, feet per second, gallons per minute, milligrams per liter, pounds per gallon, yard, ounce, parts per
billion, etc., etc., etc. Units are the “driver” for problem solving in many waterworks math questions. The reason for this has to do with how processes are measured. For example, many water meters measure usage in hundred cubic feet. However, when
Utility Managers report total usage by a class of customers it is typically expressed as acre feet or million gallons. Another example can be when dosage calculations are performed. Many times flow rates are measured as gallons per minute, but dosage
computations require million gallons per day. These are just a couple of examples demonstrating the common conversion between units. In an introductory water mathematics course unit conversion is typically explained in a “unit by unit” break down. Here we are converting from cfs (cubic feet per sec) to gpm (gallon per minute).

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