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Modeling and
GIS Integration
Considering that a GIS
contains most of the data needed for a water distribution system hydraulic
model, integrating the two is becoming more common through advances in software
technology. This integration not only enables the transfer of results from the
model to the GIS, but it facilitates model updates.
However, due to inherent
differences between the objectives of a GIS analyst and those of a hydraulic
modeler, integration isn’t always easy. Learning tips to overcome potential
pitfalls is essential to reaping benefits and avoiding inefficiencies.
Steady-State
VS. Transient
Hydraulic Modeling
Steady-state
hydraulic computer models are commonly used by water utilities for
water system planning, design, and operation analyses and investigations.
Transient models, however, aren’t as widely used due to perceived complexity and previously prohibitive costs.
| As
Previously Defined . . . |
| Hydraulic
transient analysis is often referred to as “surge”
or “water hammer analysis.” |
While
steady-
state
hydraulic models are often used to simulate water age, quality parameters and flow and pressure
conditions that don't vary quickly over time;
transient hydraulic models can be used to:
>evaluate
potential water system transient
pressure conditions
>
design surge control equipment
>
establish system operation procedures
Big
Picture
Technologies and
standard design practices are changing. The usefulness and cost effectiveness of
both GIS and modeling integration and transient modeling is becoming
increasingly apparent in the water industry.
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