Presentation Summary. What, Why, and How. Building the Model. Facility Data Acquisition. Model Calibration. Real World Applications/Case Studies

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Chrystal Boone
6 years ago
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1 Uday Khambhammettu Randolph Rostas VA AWWA

2 Presentation Summary What, Why, and How Building the Model Facility Data Acquisition Model Calibration Real World Applications/Case Studies Model Maintenance Question and Answers Page 2

3 What is Hydraulic Modeling? Network simulations, which replicate the dynamics of an existing or proposed system, performed when it is not practical for the real system to be directly subjected to experimentation, or for the purpose of evaluating a system before it is actually built. In addition, for situations in which water quality is an issue, directly testing a system may be costly and a potentially hazardous risk to public health. - Tom Walski* *Advanced Water Distribution Modeling and Management, Bentley Institute Press Page 3

4 Why Hydraulic Modeling? Master Planning Fire Protection Water Quality System Design Daily System Operations Page 4

5 How to perform Hydraulic Modeling? Available Rescources Software o EPANET (FREE) o KY PIPE o WATER CAD o WATER GEMS o INFOWATER Technical Guides o AWWA M32 Manual, 3 rd Edition Page 5

6 Building the Model

Water Model Background Info Electronic mapping of infrastructure Existing/Under Construction/Conceptual o Transmission/Distribution Mains o Fittings o Fire Hydrants o Tanks

7 Water Model Background Info Electronic mapping of infrastructure Existing/Under Construction/Conceptual o Transmission/Distribution Mains o Fittings o Fire Hydrants o Tanks (Elevated/Stand Pipes) o Valves o Water Meters o Pumps Water Model Software Selection InfoWater by Innovyze was selected o Compatible with GIS o Available training and technical support Page 7

8 Facility Data Acquisition

9 Tanks Overflow Elevation Volume (cu. ft) Bottom of the Bowl Elevation Bowl Depth (ft) Ground Elevation Page 9

10 Pumps Number of Pumps Diameter & Elevation Design Head (50 ft) Pump Stop Pump Start Design Flow (5,000 gpm) Page 10

InfoWater GIS Exchange Model Features & Attributes Pipes (installation date, City ID, length, material, Page

11 Features & Attribute Information GIS Features & Attributes Pipes (installation date, City ID, length, material, diameter, phase, zone) Tanks (installation date, City ID, type, elevations) Pumps (installation date, City ID) InfoWater GIS Exchange Model Features & Attributes Pipes (installation date, City ID, length, material, diameter, phase, zone) Tanks (installation date, City ID, type, elevations) Pumps (installation date, City ID) Page 11

12 Water Model Network Page 12

13 Model Network Errors Disjoint Pipes Over lapping Pipes Disconnected Junctions Orphaned Junctions Disconnected Junctions Page 13

14 Demand Data Customer billing records Top 20 largest water users Consumption applied to closest junction Diurnal pattern applied to every junction Demand Multiplier Time (hr) Page 14 Water Meter Junction

15 Model Calibration

16 Field Tests Pressure (psi) Time (Days) Page 16

17 Appropriate Calibration Level Model Calibration Difference between field data and model simulations Long Range Planning Design Operational Strategy Energy Management Water Quality Confidence Good Decision Making $AVING$ Loose Calibration Tight Calibration Page 17

18 Case Studies

19 Case Study 1: Village of Holland Water Tank Water Transmission Main Connecting Suffolk Main System to Village of Holland Village of Holland DEQ Consent Order To Reduce Fluoride Concentration Elementary School City of Suffolk Westport Tank Page 19

20 Case Study 1: Village of Holland Water Tank Initial Concept Existing Pressure Zone New Pressure Zone Final Design Page 20

21 Case Study 1: Village of Holland Water Tank The water model was useful in Sizing the water main Sizing the new elevated storage tank Verifying various new pump station location scenarios Repurposing existing pump station Verifying the new pressure district concept Determining the potential pressures for all customers in the new pressure district Eliminating the need for a new pump station and reducing the size of storage tank, a saving of up to $1M Page 21

22 Case Study 2: Northgate Tank Examine proposed 2MG standpipe and pump station configuration in industrial zone Verify if standpipe can be replaced with elevated storage tank Identify alternate ways to provide high fire flows of 4,000gpm for 4-hour duration without storage tank Maintain system pressures above 20 psi during fire flow events Page 22

23 Case Study 2: Northgate Tank Page 23

24 Case Study 2: Northgate Tank Page 24

25 Case Study 2: Northgate Tank The water model was useful in Establishing system pressures with and without the tank Determining available fire demand flow without the tank Identifying the system improvements to be made if the tank and pump station were not to be built Eliminating the need for a new pump station and storage tank, a saving of up to $4M Page 25

Capacity Curves Future Tasks Master Planning Water Quality

26 Other Uses of Water Model Current Tasks System Pressure Maps What-if Scenarios Water main/tank/pump out-of-service scenarios Capacity Curves Future Tasks Master Planning Water Quality Emergency Planning/Response Energy Management Analysis Future Demand Analysis Page 26

27 Model Maintenance

28 Model Updates Model pipes and facilities from GIS Evaluate model results periodically based on the newer field tests Model demands Page 28

29 Conclusions GIS utility information and data validation made the creation of water model a straight forward process Optimize operations by evaluating scenarios Prioritize projects within the Capital Improvement Plan Several million dollars saved in Capital Improvement Plan Page 29

30 Acknowledgements Stewart Lassiter Utilities Engineering Manager, City of Suffolk, VA Vernon Land Water Production Manager, City of Suffolk, VA Steve Dunn Operations Supervisor, City of Suffolk, VA Vicki Smith Quality Control Supervisor, City of Suffolk, VA Peter Oram Associate Vice President, AECOM VA AWWA

31 Thank You VA AWWA

Hydraulic Analysis Comparing Efficiency of One and Two Zone Pressure Water Systems

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