Onsite Arithmetic: O&M Problem

Test your septic knowledge with these questions on pump tank operation
Onsite Arithmetic: O&M Problem

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1. If the pump tank is 50-by-60-by-72 inches deep, calculate the gallons per inch.

2. The off float is at 54 inches and the on float activation is at 47 inches, measured from a reference point at the surface. What is the dose volume?

3. If the supply line is 100 feet of 2-inch Schedule 40 PVC, what is the drainback volume in gallons?

4. If the cycle counter on the pump reads 46,490 today and read 45,900 on the last visit 120 days ago, what is the number of cycles recorded?

5. What is the total flow and average flow for the 120 days?

6. If the design flow was 300 gallons per day for the system, what does this tell you?

Answers are posted here — with two bonus questions.

Here’s a review of Simple Septic Math and our Pointers for Onsite Arithmetic

This article is part of a series of practice problems for installers:


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