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Ten Tasks for Building a Water Model

Task 1:    Review GIS data
Task 2:    Develop network topology
Task 3:    Input/import facilities
Task 4:    Determine node elevations
Task 5:    Define zone boundaries
Task 6:    Allocate water demand
Task 7:    Develop control, curve, etc.
Task 8:    Import fire flow demands
Task 9:    Build steady state model
Task 10:  Calibrate Model


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GeoAdvice Engineering Inc.
Unit 204, 2502 St. Johns Street
Port Moody, BC
V3H 2B4
Canada

Phone: (604) 931-0550
Fax: (604) 931-0580
info@geoadvice.com
Hydraulic Modeling

By modeling your system we will gain a full understanding of its hydraulic behaviour. We will use your model as a tool to plan infrastructure improvements, develop operational maintenance strategies and proactively manage your system.

A hydraulic model is a mathematical model of a water/sewer/storm system and is used to analyse the system's hydraulic behaviour. GeoAdvice has extensive experience in the entire suite of modeling related services:

 

Model Building

Although the model represents a simplification of the water/sewer/storm system, GeoAdvice will use detailed and comprehensive data to build the model. Reliable data from various sources will be used such as:

  • Historical data
  • Network and physical data
  • Field data

The objective of model building, the intended use of the model and the required level of accuracy will be discussed with GeoAdvice prior to the model building.

It is not unusual to have conflicting records during the construction of the model. It is an ideal opportunity to update your system records (GIS, ACAD, As-built).

GeoAdvice can help you to determine your model data requirements. Below are hydraulic network modeling data to be collected for pipes.

  • Internal and external diameter
  • Length
  • Roughness value
  • Connectivity
  • Age
  • Material
  • Lining and year of lining
Field Testing

Field data collection for model calibration is a time-consuming and expensive task. It is therefore important to define a reasonable density of field testing equipment while maintaining an acceptable level of calibrated model quality and accuracy.

GeoAdvice can assist you in setting up your field test program and determine the optimal location and density.

Model Loading and Allocation

Determining accurate, representative loads and the spatial distribution of load throughout the network model is a key element of modeling. Load data can be derived from many sources including:

  • Flow metering
  • Water consumption records
  • Telemetered system flows
  • Estimates from consumer characteristics (population, land use, traffic counts)

Using geospatial modeling tools, GeoAdvice will allocate these data as load values at individual nodes within the network model.

Model Calibration

Traditionally, model calibration has been a manual task, the modeler making changes to the parameter values on a trial-and-error basis to achieve an effect which he considers will result in an overall convergence between field and model data. GeoAdvice will use GA optimization to match model predictions with field measures.

Network Analysis

Once the model has been validated, GeoAdvice will use it as a means of understanding the system operation under different conditions. GeoAdvice will perform the following network modeling analyses:

  • New pumping or valve arrangements can be tested
  • Several scenarios of demand variation can be analyzed
  • Future growth can be simulated
  • Contingency plans to cope with bursts can be assessed
  • Provide fire fighting capabilities to meet land-use requirements
Maintenance

The future accuracy of the model will depend on regular updating, maintenance and even re-calibration to reflect physical changes in the network. The model should be updated to include any changes to the system. Again, GeoAdvice can help you!


For further information, please call (604) 931-0550 or e-mail us at info@geoadvice.com.