AL/MS AWWA Effective Backflow PreventionAugust 26, 2013Sam McElroy, PECivil Services, LLCsammc@knology.net(256) 755-0050

IntroductionYears ago, water systems did not include any form of backflow prevention in system designs. Today, systems are required by law to develop and implement a backflow prevention program which meets states requirements. We will look at basic policies for residential, commercial, irrigation and fireline backflow prevention. To help establish if the program is effective, we will consider the functionality, cost, and convenience of the system. We will also consider the acceptance of the program by the customers, the public and regulatory officials.

Cross Connection/Backflow Prevention - Definitions

Cross Connection - Any physical connection or other arrangement through which unauthorized or potentially harmful materials can be introduced into drinking water.Backflow a reversal of the normal direction of flow within a piping system.A backflow program should effectively protect a water systems distribution lines from contamination or pollution from foreign substances which may compromise health.

Check Valves -- typically do not have test ports. Are not considered true backflow preventers.Dual checks -- low hazard installations.Double Checks -- standard installations. Most common required.RPZ --- high hazard installations, chemicals, treatment plants, hospital.

Backflow Prevention - What is it?

Backflow Prevention - What is it?

Backflow Prevention Codes

No single rule.Different states, city, counties have different requirements.Authority having jurisdictions may vary water departments, fire departments, regulatory agencies, health department, inspection departments, etc.

Backflow Prevention

Alabama vs. Mississippi BFP Requirements

Alabama State LawalabamaBFP.pdf

Every connection shall have a BFP installed.

Alabama vs. Mississippi BFP Requirements

mscrossconnection.pdf

Mississippi State LawNo low hazard installation shall be required to have a BFP.

Cost

Installation Cost

Maintenance Cost

Eye Soar - Above ground installations, loss of land use

Monitoring systems on some installations

Communication

Does the public understand your BFP policy?How do you communicate your departmental requirements. How does the industry communicate BFP requirements? Marble Mountain Sprinkler Burn.mpg

Effective BFP ProgramsMany different programs and requirements exist for BFP requirements.Each system is required by law to develop and implement a backflow prevention program which meets minimum states requirements. Your program is most effective when you consider the functionality, cost, and convenience of the program. These aspects of the program should convey to customers the value of life safety though effective communications with customers and the public.

Questions ???Comments

Sam McElroy, PECivil Services, LLCsammc@knology.net(256) 755-0050