CME CME Water & Wastewater Systems 1

Question 1

What design standard is most commonly used for potable water distribution system hydraulics in the US?

Accepted Answer

Ten States Standards (Recommended Standards for Water Works)

Answer

The Ten States Standards (Recommended Standards for Water Works) is the most widely used guidance document for potable water system design across the Midwest and Northeast US.

Question 2

Which federal regulation sets the primary drinking water standards that municipal water systems must meet?

Accepted Answer

Safe Drinking Water Act (SDWA)

Answer

The Safe Drinking Water Act authorizes EPA to set National Primary Drinking Water Regulations (NPDWRs) that municipal water systems must comply with.

Question 3

What is the minimum residual chlorine level (free chlorine) EPA recommends maintaining throughout a distribution system?

Accepted Answer

0.2 mg/L

Answer

EPA recommends maintaining at least 0.2 mg/L free chlorine residual throughout the distribution system to prevent microbial contamination.

Question 4

What does the Hazen-Williams equation calculate in water distribution design?

Accepted Answer

Head loss due to friction in pipes carrying water

Answer

The Hazen-Williams equation is an empirical formula used to calculate friction head loss in water-carrying pipes for distribution system design.

Question 5

What is the primary purpose of a water system's storage tank (elevated or ground-level)?

Accepted Answer

Equalize diurnal demand fluctuations and provide emergency fire flow storage

Answer

Water storage tanks equalize daily demand variations, maintain system pressure, and provide reserve capacity for fire fighting and emergencies.

(CME) Certified Municipal Engineer Practice Test

(CME) Certified Municipal Engineer Practice Test

CME CME Water & Wastewater Systems 1