Watercom’s DRAINS a “Key Tool” in Western Sydney Airport Drainage Network Design

3 March 2022

We offer our huge congratulations to Aurecon’s Yuna Chen and Arcadis Australia Pacific’s Rob Peterson on their great presentation on the Western Sydney Airport (WSA) drainage network design project, as part of the Stormwater NSW Technical Event on 3 March. This was a huge and complex undertaking, and we’re proud that the WSA team cited DRAINS as a key tool in achieving the complex modelling required.

The Western Sydney Airport site has a total catchment area of 1,400ha, and the proposed trunk drainage network consists of approximately 48km of underground pipe network, 56km of open channels, 8 detention basins and 10 bioretention basins. Adding to the design complexity, the detailed design of the drainage network considered four milestone development stages concurrently.

In their presentation, the WSA team praised Watercom’s DRAINS, stating:

  • Model validation, achieved through DRAINS 1D, produced model results comparable to Tuflow‘s rainfall on-grid 2D model using ARR 2019 procedures
  • The RAFTS hydrological model and the Full Unsteady Hydraulic engine in DRAINS allowed the team to effectively meet project requirements
  • The faster-running 1D network model provided substantial benefits to meet the tight delivery programme


We were also proud to provide support to Aecom throughout this project.

Read more about the Western Sydney Airport project and this presentation at Stormwater NSW.


If you’d like to see how DRAINS can help your project, contact us.

Message from the Director

2 March 2022

Profile pictureI am incredibly proud and humbled to be taking over as Director of Watercom from today, as part of Watercom’s transfer of ownership to Kustom Engineering Pty Ltd.

In my role as Watercom’s manager over the last three years, I have seen this company thrive and grow, and rise to meet all challenges. Our tools are now used by over 1200 organisations around the world, and we have firmly cemented Watercom’s position as Australia’s leading modelling and analysis software for stormwater and drainage systems.

And the best is yet to come.

For almost 20 years, I have lived and breathed civil engineering – I am passionate about this industry. As a civil engineer myself, I have seen first-hand the needs and opportunities in our field, and as an academic and educator, I have had the privilege of helping shepherd the next generation of engineers into their careers, and to contribute to guiding our profession into the future.

And now, I couldn’t be more excited for the future of Watercom.

Watercom and Kustom Engineering have already shared a close and successful relationship for years, and I’m eager to show you what will come from the joining of these two industry leaders. And that’s just the tip of the iceberg, with more announcements to be made in the coming months about new features and technologies, new partnerships and collaborations, and new ways to use and access your Watercom software.

You can read more in our announcement, or please reach out to us with any questions.

Thank you for your support, and I look forward to continuing this exciting journey with you.

Dr. Benjamin Kus
Director and Principal Civil Engineer, Watercom

Announcement: Transfer of Operations

2 February 2022

We are pleased to announce that from Wednesday, 2 March 2022, Watercom Pty Limited will be transferring the ongoing development, sales and support of the DRAINS, PIPES and PIPES++ software to Kustom Engineering Pty Ltd, led by Dr. Benjamin Kus. Kustom Engineering will be trading under the Watercom brand.

For you as a customer, nothing will be changing – you will continue to receive the software you rely on, from the Watercom you know and trust.

Who is Dr. Benjamin Kus?

Dr. Benjamin Kus has overseen the operational and strategic direction for Watercom and its software suite for the last three years in his role as Manager of Watercom, as well as Director of Kustom Engineering. He has led both companies seamlessly toward this transition, all the while maintaining Watercom’s position as Australia’s leading modelling and analysis software for stormwater and drainage systems.

In this same period, Kustom Engineering have firmly cemented themselves as an essential provider of workshop and training solutions in this highly specialised sector.

Facing Challenges Together

The last two years have been challenging for many, but this close partnership between Watercom and Kustom Engineering has allowed us to help our customers thrive.

    • We were able to provide free work-from-home cloud licensing throughout the 2020 lockdowns to support our trusted and loyal customers during a difficult transition into new ways of working.
    • We were able to continue our industry-recognised face-to-face DRAINS workshops by transitioning to online webinars, introducing a free 2-hour Introduction to DRAINS E-Learning webinar, and a full, online 15-hour DRAINS and ARR-2019 E-Learning webinar, with more than 600 engineers enrolled in 18 months.

A Legacy

For the last 30 years at the helm of Watercom Pty Limited, Bob Stack has been responsible for the development and support of DRAINS, PIPES and PIPES++, and due to his guidance this full-featured and user-focused software is now used in over 1200 organisations across Australia and around the world. After 50 years in the water supply, sewerage and stormwater industry, Bob will be stepping back from this role on March 2nd, 2022, as he hands over this responsibility to Ben and the capable team to continue delivering the quality service Watercom is known for.

What This Means For You

You can expect the same industry-leading Watercom products, support and service to continue going forward. In fact, the day-to-day operations of the business, emails, contact details and branding will not be changing.

What is changing is our enthusiastic and motivated team is expanding and looking towards an exciting journey ahead filled with new collaborations, new software features in development and new, more flexible ways to access your software.

Thank you for your support, and we look forward to sharing more details in the coming months as we continue this exciting journey with you.

New E-Learning Course Options

6 May 2021

Kustom Engineering is excited to release two new e-learning course options:

Introduction to DRAINS E-Learning

  • Covers 2 hours of Chapters 1 & 2 from the full 15-hour DRAINS E-Learning Course
  • 2 Hours Continuing Professional Development Points
  • Free for a limited time
Learn More

12-Month E-Learning Corporate Access Packages

  • 12-month access for groups of 8 to unlimited users
  • Personalised branding & course settings
  • Individual access & progress for each participant
  • 15 hours CPD for each participant who completes the course
  • Monthly updates on participant progress
Learn More

December 10th, 2020

We are receiving enquiries about the impact of Innovyze recently discontinuing XPRAFTS and how this will affect DRAINS RAFTS.

RAFTS is one of many hydrological models available in DRAINS. Watercom developed the RAFTS Hydrological model equations in DRAINS using the non-linear runoff routing procedures described in ARR 87. It does not use XPRAFTS. Watercom will continue to support the RAFTS model in DRAINS.

November 16th, 2020

A new version of DRAINS is available that allows users to lock pit loss coefficient (Ku) values when revising coefficients, useful when modelling GPT devices.

The former Premium hydraulic model has now been renamed to the ‘Full unsteady hydraulic model’, while the former Standard hydraulic model has been renamed to ‘Lite hydraulic model’.

New Online DRAINS & ARR E-Learning Platform

Kustom Engineering is excited to announce our online DRAINS & ARR E-Learning platform.


24 August 2020

Due to COVID-19 restrictions currently in place, we have recently launched online interactive DRAINS webinars.

These webinars cover the same material as the regular face-to-face workshops, with the flexibility of developing your skills online.

  • More material than the regular 2-day core workshops
  • Certificate of completion with 15 CPD hours
  • Adjustable playback speed & re-watchable content
  • Access to a DRAINS 50-link training license
  • Options for digital or express-posted notes


Find out more at Kustom Engineering.