American Council of Engineering Companies

2004 Engineering Excellence Grand Award

CATEGORY F - STUDIES PLANNING, CONSULTING ENGINEERING SERVICES

WATER FACILITIES PLAN

SOUTH BURLINGTON, VERMONT

PROJECT HIGHLIGHTS

• Key criteria in recommended plan:

• Special Features:

Photo and award plaque

• Gathered and reviewed existing data and records for “High Service” area in South Burlington, VT.
• Developed design criteria by updating preliminary study based on water usage data, fire flow needs and coordination with CWD 20 year master plan.
• Worked with city planning and zoning staff to determine future water demands based on population growth projections.
• Evaluated several alternatives for main service area and high service area.
• Provided hydraulic analysis and computer modeling of each of the alternatives by adding each to the existing CWD computer modeling
• Developed a recommended plan presented in multiple phases with estimated costs and funding sources.
• Prepared a comprehensive report to be presented to the City of South Burlington and CWD.
• Recommended plan included phased approach:

• Providing new second 500,000 gallon tank at Allen Road.
• Raising Dorset Street tank to increase the capacity from 1,500,000 gallons to 2,100,000 gallons at a higher hydraulic grade line.
• New transmission and distribution mains for the high service area.

• Extended services to areas with higher ground elevations while maintaining minimum pressures in existing areas.
• Limited height of vertical expansion of existing Dorset Street tank.
• Improved fire flows and overall redundancy throughout service area.
• Considered types of water storage tanks suitable for the site.
• Considered the impact of “water turnover” and how best practice helped to comply with the Disinfection By-Products Rule.
• Determined needs for additional transmission main and distribution improvements.
• Considered changes in system operation from the existing 24" CWD transmission main.
• Incorporated a hydraulic analysis with future improvements considering a 20 year buildout.
• Determined the most cost effective solution meeting all of the above criteria.

• Accommodates future phases for next 50 years with additional loops and redundancy, considering pipe sizes.
• Serves as a comprehensive infrastructure planning document.
• Took into account credits for CWD supply for fire flow demands, therefore reducing storage requirements.
• Met aesthetic concerns by co-locating tanks or raising tanks.