Watercom Customer Support

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First software provider to incorporate ARR Design Procedures & BOM 2016 IFDs (January 2017)


Welcome to Watercom's customer support service. Watercom Pty Ltd is a Consulting Engineering and software development company based in Wooli, Australia specialising in water supply and distribution and drainage. This web site is intended to provide information and support for our programs PIPES, PIPES++ and DRAINS. 

About the Programs


The PIPES program calculates flows and pressures in a pressure pipe network. Typical uses of PIPES include watermain design for subdivisions, fire mains, irrigation systems, cooling water systems, pipework and plumbing systems in buildings.

The PIPES++ program is an extended version of the PIPES program and is intended for analysis of larger town water supply systems where the user is interested in monitoring reservoir levels, pump operating times etc over an extended time period (eg 24 hours) with system demands varying with time. It also includes water quality simulation which can be used to predict how chlorine and fluoride concentrations vary with time throughout the network.

The demo version of these programs are limited to a maximum of 5 pipes and is available from the Download page. There is no limit to the size of network which the full programs will analyse.


DRAINS is a Stormwater Drainage System design and analysis program. It provides a much enhanced successor to the ILSAX program which has been widely used for urban stormwater system design and analysis in Australia and New Zealand. The demo version of this program is limited to a maximum of 5 pipes and is available from the Download page. There is no limit to the size of network which the full program will analyse.

Like the PIPES programs, DRAINS provides a Windows graphical interface. Users can draw drainage system components such as sub-catchments, pits, pipes and overflow routes. Right clicking on a component will display a pop-up menu from which you can choose to enter data or view results in various formats. Several Hydrological models are available including IL-CL (the ARR 2019 preferred model), Horton ILSAX, Rational & Extended Rational Method models, and a Storage Network Routing Module that includes RORB, RAFTS and WBNM, useful where you might combine urban and rural sub-catchments in the one model, or where you just wish to use one of these models for a rural area.

Design rainfall patterns can be entered separately, including ARR 2019 temporal patterns with BOM 2016 IFDs and the NSW OEH Probability Neutral Burst Initial Loss requirements for NSW. Results such as runoff hydrographs are displayed graphically and can be pasted into other Windows programs such as spread sheets and word processors.

The DRAINS program can design and analyse stormwater drainage systems and produce summary graphs and tables, and pipe long section drawings. The image shown above is an example of the ARR 2019 1% AEP, 1 hour burst storm 6 temporal pattern including the imported NSW OEH transformational preburst rainfall to calculate Probability Neutral Burst Initial Losses (26.1mm for this storm).  

Standard VS Premium Hydraulic Model Capabilities

There are two types of Hydraulic models available with DRAINS, a Standard Hydraulic model and a Premium Hydraulic model.

The Standard Hydraulic model, included with all versions of DRAINS, solves the full unsteady flow equations in pipes and channels, but not in overflow routes. It assumes uniform flow in overflow routes and uses Manning’s equation to estimate flow depth, width and velocity in overflow routes. This is adequate for drainage systems where storage effects and backwater effects are not significant. Downstream tailwater levels are ignored and depths of ponding in sag pits are limited to the specified spill depth (e.g. 150mm).

The Premium Hydraulic model solves the full unsteady flow equations in overflow routes which is useful (and recommended) where storage effects in overflow routes are significant or where backwater effects occur. Complex surface flooding situations involve storage effects and backwater effects. Manning’s equation used in the standard hydraulic model is unsuitable for these situations. The premium hydraulic model is also recommended for design & analysis in flat terrain where surface water may pond, making simple application of Manning’s equation misleading.

The Premium Hydraulic Module includes the Premium Hydraulic model and additional features such as pumps, weirs and orifices that can be modelled as separate objects. This will allow more complex arrangements (e.g. multi-level circular or rectangular orifice outlets from detention basins, splitter pits, etc) to be modelled. It also includes flood mapping capability (in the on-line help system in DRAINS search for Flood Mapping for more information).  


Example of Detention Basin using Orifice & Weir Links with the Premium Hydraulic Model

Upcoming Workshops

Workshops and training courses on DRAINS are presented by Kustom Engineering.   Public workshops are delivered throughout the year at various locations around Australia.  Alternatively, a private workshop can be tailored and delivered at a location suitable for your business.  Please see www.kustomengineering.com.au for more details. 

Questions or problems regarding this web site should be directed to info@watercom.com.au
or Phone 612 6649 8005 (International), or (02) 6649 8005 (within Australia)