Hydraulic Computer Model – Oak Creek, WI
The Oak Creek Water and
Sewer Utility has a single surface water treatment plant
on Lake Michigan. They provide water service to all
parts of the City of Oak Creek and also serve large
wholesale customers to the west and south of the City.
The City of Oak Creek is continually growing and their
largest wholesale customer is rapidly growing. The
Utility hired us to update their Water System Master
Plan to highlight the needs for the future and address
the concerns with providing water to their growing
customers.
A new hydraulic computer model was created in WaterGEMS
by incorporating GIS data provided by the City. GIS data
from the City’s water system database was utilized
during the construction of the model. Changes to the
water system GIS file was imported into the model. By
using the City’s GIS data, the distribution system model
contained all pipes, valves, and fire hydrants.
The model was visually checked and then calibrated using
fire flow test data. It was necessary to rerun field
simulations in the high zone with the largest wholesale
customer disconnected during the field tests because
flow was possible from the customer’s elevated tank
during a fire event.
Steady state and extended period simulations were
completed under current and future conditions. The
system was evaluated on its capability to serve all of
its customers, especially their largest wholesale
customer. Flow control between the Utility and its
largest wholesale customer was evaluated to meet the
requirements of the water service agreement between the
two entities. Additional treatment and pumping capacity
was determined to be required at the water treatment
plant to meet future demand conditions. Additional
booster pumping capacity into the high zone serving the
largest wholesale customer was also identified to be
needed along with transmission main to achieve the
additional flow required in the western portion of the
City.
Hydraulic Water System Model – Morgantown, WV
The Morgantown Utility
Board (MUB) provides water service to an expansive area
surrounding the City of Morgantown. MUB hired us
to create a hydraulic water system model for use in
completing the Initial Distribution System Evaluation (IDSE)
requirements of the Disinfectants/Disinfection Byproduct
Rule-Phase II (Stage 2 DBPR), which was mandated by the
Environmental Protection Agency (EPA). The model was
used to identify locations within the distribution
system that had potentially high concentrations of total
trihalomethanes (TTHMs) and haloacetic acids (HAAs).
This was done by calculating the water age in each tank
during an extended period simulation.
The model was created using WaterGEMS. Pipes were
traced over existing distribution and topographic maps
as well as 32 tanks were calibrated.
Base demands were calculated separately for each of the
17 zones and individual demands were applied for 125
large users in the system. Each zone was successfully
calibrated under steady-state conditions using field
fire flow and c-factor test information before
progressing to extended period calibration. Tank records
from the largest tank in each zone were acquired for a
24-hour period and operational controls and initial
settings were altered until the model successfully
simulated actual tank levels. The model was then used to
simulate the water age in all storage facilities by
proving repeatable water level patterns over an extended
period.
All of the parameters were met and we were able to
provide records of data input, demand allocation,
calibration history, and model output that were included
in the submission of the required IDSE form. In
addition, we completed all portions of the required form
that were directly related to the model.
.
back to top
|
