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Most people picture the excavator when they think of earthworks. The big arm, the bucket, the dirt coming out of the ground. What they rarely think about is where all that dirt goes, and that part is just as important. On a bulk earthworks job, the machine that moves the spoil is often the one that decides whether the site runs to schedule or sits there waiting. That machine, on a lot of our sites, is an articulated dump truck. Ours carries up to 30 tonnes a load and is built to work in most ground conditions Melbourne can throw at it. It is not the flashy part of the operation, but it is the part that keeps everything else moving. What an articulated dump truck actually does A dump truck on an earthworks site has one job: take material from where it is being dug and move it to where it needs to go. That might be spoil heading off to a stockpile, fill being shifted across a site to build up a level, or material being loaded out and carted away entirely. The "articulated" part is the bit worth understanding. A rigid truck is one solid frame from cab to tray. An articulated truck bends in the middle, at a pivot point behind the cab. That single design feature changes what the machine can do. It gives a much tighter turning circle, so it can work in confined sites and around obstacles. More importantly, it lets the truck keep traction and stability on soft, wet or uneven ground, the kind of terrain that bogs down a rigid truck or a road-going tipper in minutes. For a city like Melbourne, that matters more than it might sound. Plenty of sites here involve heavy clay, recently cut ground, or conditions that turn greasy after rain. A truck that keeps working through all of that is worth its weight. Why ground conditions decide the machine There is no single right machine for earthworks. The right machine depends on the ground, the access, and the volume of material being moved. Melbourne's growth corridors in the west and north are a good example. These are large, open sites being prepared for housing and infrastructure, often with thousands of cubic metres of material to shift. The ground can be dense clay that holds water, and in the wetter months it does not dry out quickly. On a site like that, an articulated truck earns its place because it keeps hauling when conditions are against it. Inner-suburb work is a different problem. Tighter access, less room to manoeuvre, neighbours close by. Here the value of articulation is the turning circle and the ability to work cleanly in a confined space rather than raw volume. Matching the machine to the conditions is one of the quiet skills of earthmoving and transport work. Bring the wrong gear and you either damage the ground, slow the job down, or both. The earthworks cycle: how it fits together A bulk earthworks operation runs as a cycle, and every machine in it depends on the others. It usually starts with the excavator. On our larger jobs that is a 22-tonne machine, often running GPS machine control so the operator can cut to the design levels straight off a digital model, accurate to millimetres without endless string lines and survey checks. The excavator loads the dump truck. The truck hauls the material to where it is needed, tips it, and comes back for the next load. A dozer then spreads and trims, and the surface is compacted to spec. The truck sits right in the middle of that loop. If the haulage cannot keep up, the excavator ends up sitting idle waiting to load, and an idle excavator on a bulk job is money standing still. Get the haulage capacity right and the whole cycle flows. This is why we think about the truck as much as the digging gear. A site cut is only as fast as its slowest link. When we formed a house pad in one of the growth corridor suburbs, the job involved moving roughly 1,500 cubic metres of dense soil. That volume only gets shifted on time if the loading and the hauling are matched to each other. The excavator cuts, the truck moves it, the dozer trims, and the levels come out accurate for whoever builds next. The part of landscaping nobody sees Earthworks is the foundation that everything else is built on, and most of it disappears the moment the job is finished. Before a single plant goes in or a paver gets laid, the ground has to be right. Levels set correctly. Drainage considered from the start. Fall directed where it should go. Underground services like sewer and stormwater installed at depth. Get the groundwork wrong and you pay for it later, often by digging up finished surfaces to fix what should have been done first. This is where bulk earthworks connects to the rest of a project. The same site preparation that starts with an excavator and a dump truck ends, eventually, as a finished landscape construction job: paving, planting, turf, the visible result. The two are not separate trades happening to share a site. They are the start and end of one continuous process, and the quality of the finish depends heavily on how well the groundwork was done. It is the reason we treat earthworks as horticulture's foundation rather than a separate business. The same crew that understands what a garden needs to thrive understands why the levels and drainage have to be right from day one. Why experience shows up in the boring parts Anyone can hire a machine. The difference is in the decisions that get made before and during the work. Knowing which truck suits the ground. Reading how a site will behave after rain. Sequencing the cut so the haul routes stay workable instead of churning to mud halfway through. Setting levels with drainage already in mind so the next trade is not left with a problem. None of that is glamorous, and none of it shows up in the finished photo, but it is what separates a site that runs smoothly from one that bogs down and blows out. CHS has been doing civil earthworks and site preparation across Melbourne since 1995. Over that time the work has spanned residential house pads, schools, wetlands restoration, drainage and sewer installation, and large growth corridor developments. The common thread is not the size of the job. It is getting the unseen part right so everything built on top of it lasts. You can see a range of that work on our projects page . Frequently asked questions What is an articulated dump truck used for? An articulated dump truck moves large volumes of soil, rock and fill around an earthworks site. Its bending frame gives it a tight turning circle and strong traction on soft or uneven ground, which makes it well suited to bulk excavation, site cuts and material haulage in difficult conditions. How much can a 30 tonne dump truck carry? A truck in this class carries up to around 30 tonnes of material per load. The exact figure depends on the material being moved, since dense, wet soil weighs more per cubic metre than dry, loose fill. What is the difference between an articulated and a rigid dump truck? A rigid dump truck has one solid frame, while an articulated truck pivots in the middle behind the cab. The articulation gives a tighter turning circle and far better performance on soft, wet or uneven ground, which is why articulated trucks are common on civil earthworks sites. Do you handle earthworks across all of Melbourne? Yes. CHS carries out bulk earthworks and site preparation across Melbourne, including the western and northern growth corridors and inner suburbs. The right machine for the job depends on the access and ground conditions at each site. Does earthworks need to happen before landscaping? In most cases, yes. Levels, drainage and any underground services need to be set correctly before paving, turf or planting goes in. Getting the groundwork right first avoids costly rework once the visible surfaces are finished.

A 20,000 litre water tank is a big piece of kit. Sitting on the surface, it would dominate a backyard or eat into usable space on a commercial site. Put it underground, and the same capacity disappears beneath your feet. Once the backfill goes over the top and the ground is reinstated, you would never know it was there. That is the quiet appeal of underground water storage, and it is a job we are being asked about more often across Melbourne. Homeowners investing in established gardens want a reserve to draw on through summer. Commercial and civil sites need storage that does not compromise the surface area they have allocated to other uses. In both cases, going below ground solves the space problem. What it does not do is make the job simpler. If anything, an underground tank asks more of the groundwork than a surface one ever would. Here is what actually goes into installing a tank like this, and why the part you cannot see is the part that matters most. Why put a water tank underground at all The obvious answer is space, and for a lot of properties that is the whole story. A tank holding 20,000 litres is not small. Above ground it needs a footprint, clearance around it, and usually a screen or some landscaping to stop it becoming the first thing you see. On a tight inner-Melbourne block, or a site where every square metre is already spoken for, that is space most people would rather use for something else. Underground storage removes that trade-off. The capacity is identical. The difference is that it sits beneath a lawn, a driveway, a garden bed, or a paved area, doing its job out of sight. For residential properties where the garden is the point, that means no bulky tank interrupting the design. For commercial and civil sites, it means surface area stays available for buildings, hardstand, parking, or landscaping. There is a second reason that matters in Melbourne specifically. Water security has become a genuine consideration rather than an afterthought. A buried reserve of this size gives a property a real buffer, whether that water is captured rainfall feeding an irrigation system or a held reserve for a larger landscape. Through a long, dry Australian summer, 20,000 litres goes a long way. What 20,000 litres actually gets you It helps to put the number in context. Twenty thousand litres is enough to make a meaningful difference to how a property manages water, not just a token gesture. For an established garden running an irrigation system, that volume can carry the watering load through stretches of dry weather without leaning on mains supply. For a larger landscape, or a commercial site with planting to maintain, it provides a reserve that buys flexibility when restrictions tighten or rainfall does not arrive on schedule. Sizing a tank is its own decision, and it depends on what the water is feeding, how much roof or catchment area is available to fill it, and what the property is trying to achieve. A tank that is too small empties before it is useful. One that is too large for its catchment never fills. Twenty thousand litres tends to suit properties with a real garden or landscape to support and the catchment to keep it topped up, which is exactly the kind of work that sits across both garden and civil sites. The groundwork is the real job This is the part people underestimate. The tank is the visible product, but the install lives or dies on what happens in the ground before the tank ever arrives. It starts with the excavation. A pit for a tank this size has to be cut accurately, shaped to suit the tank, and dug to the right depth. Get the dimensions wrong and you are either fighting to fit the tank or backfilling a gap that should never have been there. This is where accurate machine work earns its keep. A clean, correctly shaped excavation sets up everything that follows. Then comes the base. An underground tank needs to sit on a properly prepared and compacted foundation. The base has to carry the weight of a full tank, stay stable over time, and give the tank an even surface to rest on. Skip the preparation, or compact it poorly, and the tank can settle unevenly once it is full and loaded. That is the kind of problem that does not show up on install day. It shows up years later, and by then it is expensive to fix. With the base right, the tank is lowered into position and levelled. Levelling is not a nicety. A tank sitting off level puts uneven load on its structure and affects how it performs over its life. Only once the tank is sitting true and stable do connections get made and backfill begin. The backfill itself has to be done carefully and evenly around the tank so it is supported on all sides rather than pushed out of position. None of this is visible in the finished job. That is rather the point. A good underground tank install is one nobody ever thinks about again. Where civil earthworks meets water systems A job like this sits in an interesting spot. It is not purely earthworks, and it is not purely a water or irrigation job. It needs both, on the same site, working together. The excavation, the base preparation, the levelling, and the backfill are civil earthmoving and earthworks work. That is the discipline that makes sure the hole is right, the foundation is sound, and the tank is set properly. The other half is understanding what the tank is for and how it connects into the wider system, which is where irrigation and water systems experience comes in. A tank is only as useful as the system drawing from it, so the storage and the supply need to be planned as one. Bringing both capabilities to a single site is not something every operator can do. Plenty of landscaping outfits handle planting and maintenance. Plenty of civil contractors handle bulk earthworks. The work that combines accurate excavation with an understanding of how water moves around a property is a narrower field, and it is the kind of integrated job CHS has built decades of experience around. Underground storage and Melbourne's climate Melbourne's weather makes a strong case for on-site water storage. The city swings between wet stretches that fill catchments quickly and long dry runs that put established gardens under pressure. A property that captures water when it is plentiful and holds it for when it is not is far better placed than one relying on mains supply and hoping for rain. For anyone investing in a serious garden, an irrigation system, or a water-wise landscape, storage is the piece that ties it together. It supports more sustainable irrigation, reduces reliance on town water, and helps a property stay green through the months when it matters most. Pairing storage with a well-designed irrigation setup means the water captured in winter is still working for the garden in February. This is the same thinking behind a lot of the landscape construction and garden work happening across Melbourne right now. Water is no longer an afterthought bolted on at the end. It is being designed in from the start, and underground storage is often the most practical way to hold a meaningful reserve without giving up the space above it. Residential and commercial both benefit On a residential property, the driver is usually the garden. An owner who has put money and thought into established planting wants the security of a reserve and the convenience of irrigation that is not at the mercy of restrictions. Underground storage delivers that without the tank becoming a feature nobody asked for. On commercial, civil, and growth corridor sites, the considerations are different but the logic is the same. Storage might be there for landscape irrigation, for site water management, or as part of a broader civil works package. The surface stays free for its intended use, and the storage does its job underneath. These are the kinds of larger sites where the earthworks side of the job is substantial in its own right, and where having one team handle both the excavation and the water side keeps the project moving. A few things worth thinking about before you install If underground water storage is on your radar, a handful of questions are worth working through early. What is the water for? Irrigation, general garden use, a held reserve, or site water management. The answer shapes the size and how it connects in. How much catchment do you have to fill it? A tank only earns its place if it actually fills. Roof area and other catchment determine whether 20,000 litres is the right number or whether you want more or less. What is the access like? Getting machinery in to dig a pit this size, and getting the tank itself onto the property and into position, needs space and planning. On a tight site this is part of the job that has to be sorted before anything starts. What is going over the top? A tank under a lawn is a different proposition to one under a driveway or paved area that will carry load. That affects how the install is detailed. Working through these up front is the difference between a tank that quietly does its job for decades and one that becomes a headache. Most of it comes down to planning and getting the groundwork right, which is exactly where experience pays off. The takeaway An underground 20,000 litre water tank is one of those jobs where the finished result is deliberately invisible. The value is not in the tank you can point to. It is in the capacity sitting quietly beneath the surface, the space you got to keep above it, and the groundwork that means you will not have to think about it again. For Melbourne properties weighing up water storage, whether for an established garden, a new landscape, or a commercial site, going underground is often the smartest way to hold a serious reserve. The catch is that it asks for proper earthworks and a real understanding of how the water fits into the bigger picture. Done well, you get all the capacity and none of the compromise. If you are thinking about water storage for your property or project, get in touch with CHS and we can talk through what is involved. You can also see more of our earthworks and landscape projects to get a sense of the work.

A pattern that looks effortless when it's right, and obviously wrong when it isn't

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