Calculations and Formulae

HydrauliCAD's Properties Display Styles Determine How Objects Appear in the Drawing , Colors and Size. User can have any number of Styles, quickly switching to what is needed at any time. 

Calculations:

The Hydraulic Simulation Modeling computes hydraulic heads at junctions and flow rates through pipes for a fixed set of reservoir levels, tank levels, and water demands over a succession of points in time.

From one time step to the next reservoir levels and junction demands are updated according to their prescribed time patterns while tank levels are updated using the current flow solution.
 

The solution for heads and flows at a particular point in time involves solving simultaneously the conservation of flow equation for each junction and the Headloss relationship across each link in the network. 

  

This process, known as hydraulically balancing the network, requires using an iterative technique to solve the nonlinear equations involved.
HydrauliCAD uses the EPANET Calculation Engine which employs the Gradient Algorithm for this purpose.

The hydraulic time step used for extended period simulation (EPS) can be set by the user. A typical value is 1 hour.
* Shorter time steps than normal will occur automatically whenever one of the following events occurs:
- the next output reporting time period occurs
- the next time pattern period occurs
- a tank becomes empty or full
- a control is activated.

Formulae Used:
 

Hazen-Williams Headloss Formula: 
where:
HL = Headloss in feet
Q = flow in cfs
L = pipe length in feet
d = pipe diameter in feet
C = Roughness coefficient(Hazen-Williams C-factor)

Darcy-Weisbach Formula
 
where:
HL = Headloss (Length)
g = acceleration of gravity in(Length/Time/Time)
L = pipe length (Length)
d = pipe diameter (Length)
v = flow velocity (Length/Time)
f = friction factor (unitless)
The friction factor is a function of (e/d) and the Reynolds number, where e is a roughness coefficient with units of length. The above formula can be used with any consistent set of units.

  

Chezy-Manning Formula
 
where
HL = Headloss in feet
Q = flow in cfs
L = pipe length in feet
d = pipe diameter in feet
n = Manning roughness coefficient

  

HydrauliCAD™ Mission Statement:

It is our intention to break from industry traditions, and create a true AutoCAD Hydraulic Design / Analysis Program that is Fast to Learn and Easy to Use.

Please Note: It is our intention to earn ALL of our revenue from the program itself, and NOT from creating or allowing the unnecessary need for costly training classes and support sessions.

Thus, HydrauliCAD was designed and programmed to be extremely Intuitive, Fast to Learn & Easy to Use for modelers, and for those somewhat fluent with AutoCAD but not specializing in modeling per se. 

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For Professional Hydraulic Modelers:
it is FAST, EFFICIENT and ROBUST for the Professional Modeler's highly technical needs to create the model, manage data and set up hydraulic scenarios.
 

For Project Administrators (bosses):
it is INTUITIVE & EASY for the Design Administrator's and Municipal System Manager's more "occasional" needs to review the Pro's Scenarios or to Just Jump in & Explore their own ideas & "What If" hydraulic possibilities.
 

Put HydrauliCAD to Work - Right Out of the Box
HydrauliCAD™ is Designed to be Powerful and Fast, and So Intuitive that Task & Tool Methods are "Obvious" and the Program is almost IMMEDIATELY USABLE for ALL Users and all Disciplines.

 

As an Authorized AutoCAD Developer, we decided to follow the very highest of several optional programming levels suggested by AutoCAD.
HydrauliCAD utilizes the power & solidity of AutoCAD's ARX & C++.Net programming to construct the most reliable & flexible program possible.

Seamlessly Integrated with AutoCAD:
From a CAD perspective, user can manipulate the hydraulic elements exactly the same as any other drawing entity. All hydraulic data remains only within the drawing. With no need for external data files or libraries, any data can be exchanged directly between models via the AutoCAD DesignCenter.

  

ALL Hydraulic Data is Stored Within the Single AutoCAD Drawing File:
No external hydraulic files are created, or needed to run the models. All HydrauliCAD data is retained within the AutoCAD drawing itself.

Tasks & Tools:
As a result of this level of program structure, AutoCAD Commands are accessed & utilized to perform tasks at the root AutoCAD level.
HydrauliCAD utilizes the basic AutoCAD tools to operate it's Tools & Tasks, giving the program a stability, reliability and user-familiarity not achieved by any other methods.

 

Selection Sets can be Saved:
All Selection Sets, no matter how they are collected, can be saved in the Selection Set Form, recalled later, then Edited, Appended to, or Selected from, using any of the above methods.

"Cycle Through Sets" Tool:
NOTE: You can also Cycle through the result or any Selection Set, a Saved Set or not, by Individual Object.

The HydrauliCAD Quick Select tool:
allows complex and sequential Add and / or Exclude Queries dealing with all Hydraulic Properties of the Hydraulic Objects.
This tool works together with our Save Selection Sets Tool to SAVE Sets and later recall these Saved Sets to use and / or alter (append to or exclude from) further.

  

Transfer User Settings into New Drawings:
Designers work hard to create Display Settings, Pipe Specifications (along with their Class, Nominal and Actual Sizes), Patterns, Groups, Zones etc.

With HydrauliCAD / AutoCAD Design Center, specialty User Settings are available to other drawings. Now, they do not need to be recreated.



Mix & Match Units to suit your needs. display the drawing in any Units you wish, irrespective of the units drawing was created with

Draw / Design in US Units, and Quickly display drawings in SI / Metric Units.