341+
Dams Built
30+
Years Experience
Yes
Price Guarantee
15+
Awards

We are the multi-award winning dam design, construction and repair company

check out our work

Our Latest Awards

The Strategist 2025 Top 100 companies
The Global 100 Best Dam Building Co
The Global 100 Innovation in dam design
The Global 100 Top 100 Construction CEO

DESIGNED WATER

Clean lines. Organic shapes. Inviting vistas

Big Ditch Aquatecture outstretched hand over dam

Site inspections

For just $500, I will to do a full 90 minute on-site inspection and assessment of your new dam site, or your dam repair.

That small investment will save you thousands of dollars

You get knowledge, experience and expertise gained from 30 years experience doing one thing – building earth dams – from the person who has built more earth dams than anyone else in Australia.

FIND OUT MORE
Posted on Google Google
Andrew Gorman profile picture
Andrew Gorman
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
Don’t get anyone else! Great work and great support if there are any problems. Make sure you drop in next time you’re passing through Angus! Thanks again, really appreciate your work!!
Posted on Google Google
Sarah B profile picture
Sarah B
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
Angus was incredibly helpful in diagnosing the issues with our dam. He provided clear, practical insight into why it was leaking, explaining things in a way that was easy to understand without oversimplifying the problem. His knowledge and experience were obvious, and he took the time to walk us through the causes and potential solutions. Thanks to Angus, we now have a much better understanding of what’s going on and how to address it. I’d highly recommend him to anyone needing honest, knowledgeable advice.
Posted on Google Google
Alexis Michelides profile picture
Alexis Michelides
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
Angus took the time to run through in detail what could be done to help me seal a newly constructed dam. This was despite the fact that the dam in question was outside of the area where he operated. He was fully aware and still happy to help.
Posted on Google Google
shredder88888888 profile picture
shredder88888888
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
Super helpful when we had a leak in our dam. We received genuine expert advice and we were very satisfied. Thanks so much 🙂
Posted on Google Google
liam long profile picture
liam long
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
me and the boy find this in class thank you for brightening up our day
Posted on Google Google
Kate Thorsteinsen profile picture
Kate Thorsteinsen
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
My dad would have put the first cement overflow down in the 60's sometime, when he extended the existing smaller dam. In the 00's with water starting to significantly tunnel underneath, we put a further collar down - probably a metre deep - and that did hold until it then started tunnelling further up. Hence collar 2 - and some years later - same thing - tunnelling causing us to lose a LOT of water - a steady stream on the other side. Clearly, we needed advice - and luckily came across the Big Ditch website. A phone call to Angus and we set up a video call so we could discuss what to do. Angus gave us several options, but our decision was to remove ALL the cement, pack it with clay base, cover that with soil and put in seed and reeds to prevent erosion when (if) we finally got rain. Hired a bloke with an excavator (luckily our nephew who had lots of experience - thanks Colin), and the cement was gone - on to the downside to help the erosion there. All was going well until we got late heavy rains in October and early November - which suddenly brought the water levels up. Concerned because the seed hadn't established well due to the drought, we bought squares of Buffalo grass from Bunnings and covered the spill way. More reeds and then temporary fencing to protect the lush green grass from marauding wildlife and determined stock! (despite the paddock being fenced off!) The whole way along this journey, Angus was able to offer clear suggestions and alternatives looking specifically at what we had, and what we were able to work with. He has been fabulous at getting back to us via phone or email and helping us decide what to do. We're now in the middle of summer and our dam hasn't held this well for YEARS. Thankfully we've never previously run out of water but the relief of having a significant supply at this time of year is immense. We couldn't recommend Angus highly enough. Thank you so much Angus. Kate and Dave Mt Crawford, SA
Posted on Google Google
Louie Semrani profile picture
Louie Semrani
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
Spoke with Angus from Big Ditch for nearly an hour about a leaking dam that’s been filled with debris rather than natural clay. I’m based in Sydney and he’s in Melbourne, yet he generously gave his time free of charge. Absolute legend. He clearly explained the issue, recommended the right product, where to buy it, what it should cost, and even offered to talk me through how to apply it. Old-school service, genuine knowledge, and zero sales pressure. Restored my faith in people. If I could give 10 stars instead of 5, I would. Thank mate… Lou from Wallacia in Sydney
Posted on Google Google
Temporary Things profile picture
Temporary Things
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
After 7 years of hearing 'fill it in and start again' we have every confidence that Angus will be able to turn the rather large well that we inherited (see photo) into a functional and beautiful dam. You get what you pay for and Angus clearly has the knowledge to fix our 'leakage' problem while at the same time adding some important technical and aesthetic shifts that we hadn't considered.
Posted on Google Google
James Osborn profile picture
James Osborn
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
Angus was very knowledgeable upon first inspection & has worked out a solution for our commercial farm. I look forward to working with him upon construction.
Verified by Trustindex
Trustindex verified badge is the Universal Symbol of Trust. Only the greatest companies can get the verified badge who has a review score above 4.5, based on customer reviews over the past 12 months. Read more
Big Ditch Aquatecture Dambuilders without borders

HAVE A PROJECT IN MIND?

GET IN TOUCH WITH US TODAY

Get a Fixed-Price Quote
Andrew Evans Polymer Innovations

WARNING!

Does your dam leak?

On the right is Andrew Evans of Polymer Innovations

Mr Evans has threatened to sue us twice for having a negative opinion about his product ‘Water$ave‘.

If your dam is leaking, Mr Evans doesn’t want you to know what we think about his product’s effectiveness.

Read our opinion

What makes us special?

We are the only professional dam builders in Australia who offer fixed price contracts.

We pioneered fixed price contracts because we’ve never heard of a contractor who charges by the hour – come in under budget 

Charging by the hour is advantageous to contractors. Not you

Fixed price?  No problem

  • $500 + GST site inspection & assessment
  • $2,750 + GST dam design
  • $10,000 + GST per megalitre (1-4 mgl)
  • $6,000 + GST per megalitre (5-20 mgl)
  • $5,000 + GST per megalitre (21-100 mgl)
  • $4,000 + GST per megalitre (101+ mgl)
find out more
Big Ditch Dam Design

 

Complete Design Service

You’re going to be looking at your water feature for the next 30 years, and that water feature should bring a smile to your face every time you look at it.

A bog standard round dam is not going to achieve that, so we only take on work where the client wants to create something extraordinary.

We have a very strong competitor – ourselves. Because we compete with our ourselves and our ability to create magic on every project

FIND OUT MORE
BIG-DITCH-DAM-BUILDER-COMMUNITY-LAKES
BIG-DITCH-DAM-BUILDER-RESORT-LAGOONS
Big-Ditch-Dam-Builder-Golf-Course-Water-Features
BIG-DITCH-DAM-BUILDER-AQUACULTURE-FACILITIES

BLOG

What Causes Blue-Green Algae in Farm Dams (and How to Stop It) | Big Ditch

Blue-green algae in farm dams can threaten stock. Learn the causes, warning signs, testing steps and practical prevention for Australian properties.

How to Clean Out a Silted-Up Farm Dam: When, How and Cost | Big Ditch

Learn how to clean out a silted-up farm dam, compare desilting options and costs, and stop sediment returning after the next storm.

Do I Need a Water Licence for a Farm Dam in Queensland? | Big Ditch

Farm dam water licence Queensland rules explained, including water sources, approvals and safety checks to complete before digging.

What Is a Keyway in Dam Construction (and Why It Saves Walls) | Big Ditch

What is a keyway in dam construction? Learn how this compacted cut-off trench controls seepage, strengthens earth walls and protects farm dam projects.

How Long Does It Take to Build a Farm Dam? Real Timelines | Big Ditch

How long to build a farm dam? Real Australian timelines, what causes delays, and how to speed it up without cutting corners.

Farm Dam Water Quality: The Complete Australian Guide

Farm dam water quality is measured by turbidity, algae, pH, DO and salinity. Diagnose, fix and monitor Australian farm dam water — Big Ditch's field playbook.

Can You Build a Farm Dam on Rocky Ground? Honest Answer | Big Ditch

Building a dam on rocky ground? Here’s when it works, when it leaks, and the practical fixes we use on QLD & NSW properties.

Dam Repair Australia: Methods, Costs & When to Rebuild | Big Ditch

Dam repair Australia guide covering every failure mode, repair method, cost range and regulatory requirement. Expert insight from Big Ditch.

Bentonite Dam Sealing: Complete Australian Farm Guide

Bentonite dam sealing uses swelling clay to permanently stop leaks in farm dams. Application rates, methods, costs, and soil compatibility explained by Big Ditch.

Dam Batter Slope Explained: 3:1, 2.5:1 and Why It Matters | Big Ditch

Dam batter slopes like 3:1 and 2.5:1 explained in plain English, with practical rules of thumb and when to go flatter.

Why Your Farm Dam Water Won’t Clear Up (and How to Fix It) | Big Ditch

Muddy dam water won't clear because fine clay colloids electrostatically repel. Gypsum at 100–200 g/m² flocculates them. Diagnostic guide + 5 fixes.

Farm Dam Construction in Australia: Complete Guide (2026)

Farm dam construction in Australia: six stages, real costs ($7k–$500k+), timelines, soil specs, and how to avoid the wall failures that cost five-figure rebuilds.

Big Ditch Aquatecture_Completed Dam Project_200417_365
Projects

Last month, the photos of our projects were viewed 29,755 times*

We not only build stunning water features, we take pretty pictures of them too

*Google verified

EVAPCO evaporation balls white
evap.co logo 002 PNG

Australia’s Evaporation Specialists

Big Ditch Aquatecture. Sienna Grange Dam Restoration front entrance

CORPORATE CONSULTATIONS

When Australian Unity needed  water design advice

THEY TALKED TO US

 

Visual water design for corporate brands

Australian Unity operate 19 upmarket resort style retirement communities up and down the east coast of Australia.

Their residents are sophisticated and stylish people who appreciate the serenity of beautiful water features.

When the installation at Sienna Grange needed an upgrade, we worked closely with senior management on the opportunity to create spectacular visual highlight for their landscape design.

And it all starts with the mood board that defines what success looks like.

 

 

Big Ditch Aquatecture. Sienna Grange dam design mood board
DESIGN PORTFOLIO
Big Ditch Aquatecture. Sienna Grange original dam

Australia Unity | Sienna Grange

Before

 

Big Ditch Aquatecture. Sienna Grange dam design concept

Australia Unity | Sienna Grange

Proposed

 

Big Ditch Aquatecture. Robert Oatley Olives olive groves at Gulgong before dam 1500px

CORPORATE CONSULTATIONS

Robert Oatley Olives are obsessed with perfection

SO THEY TALKED TO US

 

Robert Oatley Olives make the world’s best olive oil

The Oatley family own Hamilton Island, so they know quality.

And their Olive Oil operation at Gulgong NSW continues that heritage.

When they wanted their old leaking dam to be something they were proud of, we pushed the design boundaries of what was capable in the harsh surrounding geography that is so suitable for growing premium olives.

 

Big Ditch Aquatecture. Robert Oatley Olives promo ad
design portfolio
Big Ditch Aquatecture. Original dam at Robert Oatley Olives

Robert Oatley Olives | Gulgong NSW

Before

 

Big Ditch Aquatecture. Dam concept for Robert Oatley Olives

Robert Oatley Olives | Gulgong NSW

Proposed

 

Big Ditch Aquatecture D10 dozer

WINNER

2021 INTERNATIONAL M&A AWARDS

BEST GLOBAL DAM BUILDING COMPANY

Get a Fixed-Price Quote

BET ON EXPERIENCE

To be great at something, you must do it every day

We have over 30 years experience in dam building, and we are the industry leader in the art of earth dam construction

30
Years of experience

 

341
Dam engagements

 

31,800
Machine Hours