Page 5 - 3. References

REFERENCES 3

Burnsville, Minnesota Burnsville, Minnesota
WATER DISTRIBUTION MODEL PRESSURE MANAGEMENT (PRV)

UPDATE & UDF STUDY

DATE DATE
2015 2015
CLIENT CLIENT
City of Burnsville, MN KEY PROJECT ELEMENTS City of Burnsville, MN KEY PROJECT ELEMENTS
• Water Distribution Model • Pressure Zone Analysis
CLIENT CONTACT • Unidirectional Flushing (UDF) CLIENT CONTACT • PRV Vault Condition
Linda Mullen Program Linda Mullen Assessment
Utilities Superintendent • Pressure and Fire Flow Analysis Utilities Superintendent
952-895-4552 952-895-4552

AE2S is working with the City of Burnsville on a calibrated The goal of the pressure management (PRV) study, which is
water distribution system model that will help provide a greater currently in process, is to provide the City of Burnsville with an
understanding of the City’s water utility, a foundation for understanding of their existing pressure zones and 34 pressure
distribution system improvements, and a Unidirectional Flushing reducing valve (PRV) stations to provide a foundation for
(UDF) program. planning for future modifications and maintenance of the PRVs,
The City of Burnsville conducts a regular flushing program including the possibility of adding or removing PRVs.
and implemented a UDF several years ago for approximately one AE2S is providing services in two phases: (1) Pressure
third of the City. Since then, improvements have been made to Zone Analysis; and (2) PRV Vault Condition Assessment and
the City’s water system and better data is now available through Improvements Plan.
GIS. UDF consists of high-speed flushing (5 to 6 ft/s) as a result The pressure zone analysis phase uses the water distribution
of a systematic plan of closing valves and opening hydrants to model to analyze the current pressure zones and determine
create a one-way flow. This increases the swiftness of the water recommended pressure zone changes.
in the mains, maximizing the velocity near the pipe wall and Implementing pressure zone changes will be dependent on
producing a scouring action that removes sediment deposits and the actual condition of the 34 existing PRVs. Therefore, the PRV
biofilm. Advantages of UDF include improved water quality by vault condition assessment phase consists of assessing the PRVs
restoring the disinfectant residual; reducing bacterial regrowth; and prioritizing/estimating needed rehabilitation, replacement, or
dislodging biofilms; removing sediments and deposits; controlling relocation.
corrosion; restoring flows and pressures; eliminating taste and
odor problems; and reducing disinfectant demand throughout the
distribution system.
The scope of the UDF program is to complete a program for
the remaining two thirds of the City. This proposal includes the
initial phase of the UDF program, which is to develop a UDF plan
for a pilot area to be used as a template for developing UDF plans
for the remaining areas.
AE2S is completing the professional services in five phases:
(1) Hydraulic Model Update; (2) Unidirectional Flushing
Program - Pilot Area; (3) Water Distribution System Field
Testing; (4) Hydraulic Model EPS Calibration; and (5) Pressure
and Fire Flow Analysis.

AE2S BURNSVILLE TECHNICAL SPECIALTY CONSULTANT ENGINEERING SERVICES SOQ 3.5