SERVICES: Flow Monitoring • Flow Meter Installation • Rain Gauge Installation • QA/QC of Data • Flow Balances • Scatterplot Analysis • Meter Maintenance • Meter Calibration • Data Submittals • Manhole Inspections • Smoke Testing
WORK PERFORMED: May 2009 – February 2012
Mr. John Riggs, P.E.
Assistant Wastewater Engineer
(p) 803.545.4322 • (f) 803.988.8057
1200 Simmon Tree Lane, Columbia, SC 29201
Mr. Jay Mazzei, P.E., Associate –
Brown and Caldwell
(p) 803.873.9701 •
COST: Phase I: $208,000
Phase II: $74,500
Phase III: $310,000
Phase IV: $158,000
SCOPE OF WORK
Hydrostructures was retained by Brown and Caldwell and the City of Columbia to provide field services to support the City’s sewer system evaluation and I/I reduction program. Phase I of the project consisted of performing temporary flow monitoring within priority basins of the City’s collection system, which included the Saluda River, Rocky Branch and Smith Branch basins. The original scope included 30 flow meters and 5 rain gauges for a period of three months. An additional 16 meters and 5 rain gauges were added for two months. Hydrostructures provided site evaluations, installed the meters, calibrated and monitored the meters and provided data management and analysis services. Phase II included performing a SSES within one of the sub-basins, Saluda River Sub-Basin 09. The scope included inspection of 125 manholes with zoom camera equipment, smoke testing of 90,000 LF of pipe and dye testing of a total of 14 suspected storm drain interconnections. Phase III began in November 2011 and included system-wide flow monitoring using 65 electric flow meters and 10 rain gauges for a period of three months. Meters were installed in February 2012. Hydrostructures performed detailed evaluations of all sites, evaluated several different metering technologies (area-velocity and radar), and installed and calibrated all meters. Additionally, we set up meters on a cellular wireless system that broadcasts data in real time to web-based data service. Besides the obvious benefit of allowing the client to observe the real time data, it allowed a Data Manager to carefully monitor each site and direct meter maintenance crews to sites not logging data or operating outside of established parameters. This real time monitoring greatly reduced costs and increased meter up-time. Phase IV included a continuation of SSES activities in the Seluda River Basin, focusing on sub-basins 03, 10, & 12. The scope included above-ground inspection of 600 manholes with zoom camera equipment, smoke testing of 184,000 LF of pipe, and dye testing of 20 suspected storm drain interconnectors.