Leak Detection at C.C.W.A. History of C.C.W.A.
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CCWA produces up to 39 million gallons a day of potable water. We have a potable water storage capacity of 35.6 million gallons stored in 10 ground and 8 elevated tanks. We also own and maintain 5 raw water reservoirs that provide raw water to 3 water production facilities. CCWA serves a population of 260,000 people through a system of distribution mains 1,265 miles long.
Size Total Footage
Total footage in Clayton County is 6,681,087
Total miles of Water Main in Clayton County is 1,265’
Total footage surveyed in Clayton County is 4,805,312’
Total miles surveyed in Clayton County is 910
72% of our water system has been surveyed
The CCWA Board of Directors and Management Team began searching for ways to decrease our water loss. In March of 2000, Leak Detection was implemented.
Non-revenue water loss was nearing 20%
Leak Detection program Initiated
Meter Testing Program expanded and placed under direction of the Maintenance and Construction Department
Non-revenue water loss is at 11%
Our goal was to develop and maintain a comprehensive Leak Detection Program by surveying the entire Distribution System.
Starting a Leak Detection Crew
We investigated and demonstrated several types of Leak Detection Equipment.
After identifying the type of system we needed, our request was approved by the Clayton County Water Authority Board of Directors.
We then started a Leak Detection Crew consisting of two people.
We also added a Repair Crew made up of four people dedicated to repairing leaks that were found by the Leak Detection Crew.
Flow Metrix was able to create digital images of both area maps and detailed street plans used by the Clayton County Water Authority.
2. After everything is connected it is time to input the information in the computer.
3. Once the base and the FSU radios are linked, the correlation process will begin automatically.
Formula for Circular Orifice Q = 30.394 x A x P
Formula for Other Opening Q = 22.796 x A x P
A = Area of Opening in Square Inches
P = Pressure (PSI)
Q = Gallons Per Minute (GPM)
55 = 7.4 60 = 7.7 65 = 8.1 70 = 8.4 75 = 8.7 80 = 8.9
85 = 9.2 90 = 9.5 95 = 9.7 100 = 10.0
Example 6” Main with 1/8” wide beam break at 80 psi
GPM = 30.394 x (3.14 x 6 x 1.25) x 80
30.394 x 2.35 x 8.94 = 638.5 gpm
TOTALS March 2000 – October 2004
In 1999 we served 61,200 water customers (including accounts served by the City of Riverdale) and were producing/purchasing 10.5 billion gallons of potable water per year (171,568 gallons/customer/year).
We currently serve 73,600 water customers and are producing/purchasing 9.9 billion gallons of potable water per year (134,510 gallons/customer/year).
This programs success equates to a decreased production requirement of 5.8 MGD. That un-needed production is equal to over 50% of the capacity of our Freeman Road Water Production Facility and will delay Plant Expansions by several years.
6” Beam Break = 160 GPM
¾”bypass on 8” Fire Line = 30 GPM
6” Beam Break =508 GPM
¾” Galvanized Service Line = 9 GPM
¾” Copper Service Line = 9 GPM
6” A.C. Pipe Split = 160 GPM
The purpose of this presentation was to provide an information resource supporting the development of a Leak Detection Program and demonstrating the new technologies and management concepts to cost effectively reduce leakage to minimize your water/monetary losses.
Please call Jeff Jones, CCWA Leak Detection Foreman, at 770-960-3612 for more information.