All posts by Drainage

Watercare Asset CCTV Pre and Post Inspections

Working on a property development or construction project sometimes entails installation, modification and extension of public drainage systems. As a result, you may be required to apply for a Works Over approval.  Typically, before proceeding with the project an engineer or Watercare representative will get involved to ensure compliance is met and to ensure that the process won’t put the Watercare assets at risk of getting damaged.  

As a drainlayer, we help you ensure that the condition of any public sewer system is investigated before or after any work takes place. The inspection procedure is carried out with CCTV equipment and still images.

Watercare Asset CCTV Inspection

Before Watercare Asset CCTV Pre and Post Inspections became popular, plumbers had to do open-cut excavations. While sewer excavations can deliver results, it can be a very intrusive process. It also consumes a lot of time and costs a lot of money. Unless you are 100 percent sure that the pipe damage is severe, you don’t need to opt for a sewer excavation service. 

A CCTV drainage survey is more than enough to help you find the root cause of your drain pipe problems in a residential or commercial property. It’s also the fastest, most practical and cost-effective way to inspect Watercare assets. 

How does CCTV Pipes Inspection work?

The process involves inserting a sophisticated camera to inspect the pipes. For larger pipes, like those used in sewerage systems, a CCTV tractor is used. For smaller ones, such as those used in Watercare assets, plumbers utilise a snake profile camera. 

As the plumber pushes in the camera inside the pipes, you get to check for possible problems such as clogs, cracks and leaks. You can either have the option to check the video feed in real-time or review it after the service with the DVD provided by the plumbing company. 

Typically, the video contains overlaid text containing details like the pipe name, street address, pipe diameter, pipe shape, date and time of CCTV inspection and depth of the access points. 

After the survey is done, the plumber will discuss the findings. Below are some of the key things that you can check via a CCTV pipe inspection:

  • Hairline cracks that affect the integrity and stability of the pipes
  • Bigger cracks that can affect water pressure and bring in sand and silt inside the pipes
  • Tree roots and other organic debris stuck inside the pipes
  • Punctures on the pipe due to previous renovation work
  • Corroded or severely damaged pipes and assembly joints
  • Location of other pipe joints and how to access them
  • Pests such as cockroaches and rats that poses risk for pipe damage and health issues

Timely or regular inspection of drain pipes through CCTV surveying can help you save a lot of money on repairs or other services. It can also help you find out what plumbing issues you need to address before proceeding with a construction, development, or renovation project. If in case the sewerage pipes in the property need work because of material buildup, you can avail a combo package which includes CCTV pre and post-inspection service and drain unblocking.

Beyond Pipe Repairs and Damage Mitigation

Besides coming handy in finding plumbing issues to fix in a property you already own, a CCTV drain survey can also be useful in other scenarios. For example, before you purchase a new property, you can have the pipes inspected to check for pipe problems. 

It will help you determine whether it makes sense to invest money in a certain property. Knowing potential or existing drain pipe issues would also allow you to renegotiate the price so you can make room for your renovation expenses.

A typical CCTV survey would only cost you hundreds of dollars per hour. It’s a good investment whether you’re a property owner or a property developer.  

The Drain Pipes are Damaged or Clogged, What’s Next?

If the CCTV survey indeed reveals that your pipes are damaged or clogged, your next priority is to plan your next step. You can figure out the approach to use, depending on the severity of the problem. For example, if the results show hairline cracks, you might need to have the pipes repaired to prevent further damage. If the pipe problem arises from material build-up then the plumber can use a different approach like hydro blasting.

How Does Hydro Excavation Work?

We offer Hydro excavation services, for cost or a quote, please give us a call. 

There are times when it’s virtually impossible to dig around underground assets such as water pipes, telecommunication cables and gas pipelines. Without a detailed map of your underground assets, you might end up dealing with costly damages. Hence, instead of using traditional techniques in excavation, it’s highly advisable to use hydro evacuation. It’s a fast, risk-free and effective digging method that can be used for both commercial and residential customers.

Drainage NZ offer Hydro Excavation Services

A brief introduction into hydro excavation

Hydrovacing or hydro evacuation was first introduced back in the 1880s when miners needed to utilise pump pressurized water to wash away debris and even large land masses. This technique allows for faster and more convenient way of capturing gold plus other minerals from the ores.

Fast forward to 1969, a more sophisticated tool was invented, which they referred to as ExcaVactor. A decade after, companies offering pipe excavation services started using sewer cleaners and vacuum trucks to conduct the hydro evacuation procedure. In some companies, it’s offered alongside solutions such as the sucker truck and unblocking services.

It’s a technique used in a lot of applications. Be it a residential property or a large commercial building, hydrovacing can come extra handy in excavating debris, removing damaged pipes and more.

What happens during a hydro


Instead of digging the old-school way, hydro evacuation involves the use of pressurized water. Water is injected into the ground until the soil appear like a slurry mixture. Then, the workers need to feed the liquefied soil into the pipes of a sucker truck. The powerful vacuuming tool is strong enough to remove around 70 feet of liquefied soil.

The best part about this process is it works for any type of soil. Be it a loose garden soil, a mixture of silt and clay or even frozen ground, you can have your pipes or other underground assets dug up safe and fast.

What are the benefits of hydro evacuation?

Choosing hydro evacuation over the old digging method can help you solve all kinds of problems without risking infrastructure damage. It also provides you with a safer way for you to uncover defective underground assets. On top of that, it offers a lot of perks including:

  • Reducing cave ins resulting from the disruption of the surrounding soil
  • Faster completion of your excavation project
  • No need to use additional equipment because only water, air and sucker truck is required
  • Zero to minimal damage to pipes or other underground assets
  • Does not require additional workforce to remove soil underneath the excavation site
  • Works for a variety of soil types including permafrost
  • Can be used in hard to access locations because truck can be positioned at most 100 feet away from the site

Applications of hydro evacuation

There are many ways you can maximize the use of hydrovac. Here are some of its most common applications in both residential and commercial properties:

  • Excavation of tight spaces – Sometimes property owners have a hard time excavating because of their cramped space. Good thing, tight spaces are not an issue when hydro evacuation is used. The equipment can be placed in a distant area during the service so the workers have enough space to work on.
  • Removal of debris – Dealing with debris stuck in pipes and manholes can be quite a nightmare. With hydrovac, you get to remove debris before they even get stuck inside the drain or pipes.
  • Excavation during cold season – Working during the cold seasons comes with a lot of health hazards. However, sometimes issues such as frozen or burst pipes just happen. Thankfully, you have a better and more hassle-free option to dig up your damaged pipes. Hydrovac works seamlessly even with completely frozen soil.
  • Slot trenching – Widen trenches safely and quickly with hydrovacing. It will help you find utility lines more conveniently and safely if you use pressurized water to dig and widen trenches.
  • Potholing – Need to check underground facilities? You can do so without risking the integrity of the building’s structure. Hydro evacuation eliminates risks and allows you to work in congested areas.
  • Setting of poles – If you need to some pole drilling work done, booking a hydrovac service will also come extra handy. Hydro evacuation is the most highly recommended method to use in setting poles.
  • Utility and pipeline crossing – Working in an area with many pipes and utility crossing is a tricky process. One wrong move can result in very expensive repairs. This why it’s better to make use of hydrovac. It’s a simple yet sophisticated technique that help you move forward with work at a faster pace.

Hydrovacing is perhaps one of the most efficient methods used to excavate materials today. It’s works fast so you’re sure to get your project done within your projected time frame. The service is also made cost-effective so you enjoy more value for your money. Call today for your hydro evacuation needs.

Permanent Leaky Basement and Flooding Solutions

If you are experiencing one of the following issues:

  • Flooding Basement area
  • Water under house
  • Flooding driveways
  • Blocked stormwater drains
  • Boggy Lawns
  • Subsoil drainage problems
  • Excessive water accumulation

Then you need to think about a permanent long term solution if you care about the property. Whether you intend to sell or keep Long term solutions mean more value and more safety for the occupants and/or owners.

Drainage NZ have been doing subsoil drainage and providing flooding solutions for over 20 years! Our solutions are cost effective and you only pay once to have the problem solved first time.

Some recent flooding issues Drainage NZ has resolved

A drainage solution is not just finding someone that can dig a hole and throw a punched Nova coil into the ground. There needs to be an understanding of physics and a plan needs to be engineered which is closely linked to the issues you are facing.

Subsoil Drainage Solutions

Drainage NZ have been involved in 100s of subsoil drainage solutions around the larger Auckland area. We have done everything from engineering soak holes to providing unique thrusted and/or drilled solutions for home and business owners that assumed no solution existed.

In Auckland you will find several extreme ground conditions. Whilst in Mt Wellington you may have volcanic ground, in West Auckland or on the North Shore you will find many areas are meters deep in clay that offers zero ground percolation. Where the one offers plenty of soakage the other will offer none but both have one thing in common requiring an engineered methodology to tackle the different forms of flooding that are affecting properties.

Our solutions also include many properties that are affected by no available public storm water networks requiring self-management of roof and surface water.

Consents and Plans

If and when design and consent are (e.g in some instances pumped solutions) required Drainage NZ take care of everything. We have designers in-house that work closely with our field technicians to achieve your desired scope successfully.

Here some subsoil drainage jobs Drainage NZ have completed recently.

Location: West Auckland
Problem: Basement flooding (water leaking into room below ground and garage areas)
Depth: 1.6 meters Length: 26 meters
Scope: Excavation, waterproofing, drainage works. Reinstatement and landscaping and concrete works.
Outfall: Existing Private SW to Public Stormwater

Location: Central Auckland (Mt Wellington)
Problem: Excessive Flooding into house areas below external outside area.
Depth: 1.5 meters Length: 15 meters
Scope: Rock breaking, Excavation, waterproofing, drainage works
Outfall: Existing Onehunga Soakhole

Location: North Shore
Problem: House piling flooding. Incorrect onsite levels introduce excessive water to areas under house resulting in piling slipping, cracked walls and framing in upper levels. 
Depth: 1.2 meters to point of discharge. 
Scope: Excavation of clay, leveling ground, waterproofing, drainage works
Outfall: Existing Private Soak hole

What Is the Difference Between Sewage and Sewerage?


In our day-to-day lives, all of us normally wake up fresh out of bed, brush our teeth, take a bath, eat our breakfast, wash the dishes, water our plants, and so much more. Well, have you ever noticed that most of what we do every day requires the use of water?

Are you aware of the fact that every time you turn on the faucet, the water you most likely use will go down the drain to somewhere most of us don’t even know anything about? We just wash our hands, look at the water drain, and turn it off.

How Drainage Works

The process of draining water is way more complicated than you think. The water runs down a hole, into small house pipes, into bigger council pipes, for many kilometers to then arrive at its destination.

In most cases, not everyone knows the difference between sewage and sewerage. Is it the same thing or two completely different things. Today, we are going to look at what those two words really mean, as a learning matter and something that may benefit anyone searching for a definition.

What Is Sewage (the poo)?

Before the 20th century, sewage was usually discharged into a body of water such as a stream, river, lake, bay, or ocean. There was no treatment, so the breakdown of the human waste was left to the ecosystem. Now, the word “sewage” refers to liquids or waste matter usually carried off by sewers.

In the modern world, the word sewage is slowly being replaced by the word “waste water,” also meaning that any water that has been affected by human use, making these two words similar in the way that in the end, we humans produce waste that is to be carried out by any means of transportation, such as sinks, tubs, showers, dishwashers, clothes washers, toilets, pipes, etc.

It can be also referred to as domestic wastewater or municipal wastewater that is produced by a community of people. It is characterized by volume or rate of flow, physical condition, chemical and toxic constituents, and its bacteriologic status.

Sewage usually travels from a building’s plumbing either into a sewer, which will carry it elsewhere, or into an onsite sewage facility. Whether it is combined with surface runoff in the sewer depends on the sewer design.

The reality is that most wastewater produced globally remains untreated causing widespread water pollution, especially in low-income countries. As well as many developing countries the bulk of domestic and industrial wastewater is discharged without any treatment or after primary treatment. It may not seem like it, whether or not these are good for the environment or not, but once you see the fuller picture of how much the sewage actually helps us in our day to day lives, it makes a huge difference.

What Is Sewerage (what carries the poo)?

On the other hand, the word “sewerage” refers to the provision of drainage by sewers. Sewerage is an infrastructure that transports sewage, like storm water, meltwater, rainwater, by using sewers. It encompasses components such as receiving drains, manholes, pumping stations, storm overflows, and screening chambers of the combined sewer or sanitary sewer.

Sewerage opens an entry to a sewage treatment plant or at the nearest point of discharge into the environment. It is a system of pipes, chambers, manholes, etc. that holds the sewage from the waste makers above.

In American colloquial English, “sewer system” is applied more frequently to the large infrastructure of sewers that British speakers more often refer to as “sewerage”. Almost all the countries of the world have sewerages, but this does not mean that they are the best of ones.

Countries like New Zealand, Venice, and Amsterdam have a great sewerage, and on the spectrum, we also have countries like Bangladesh, India, and other third world countries that need help in making better sewerage’s for their citizens.


To sum things up, these two work hand in hand. One cannot work without the other and vice versa. A sewage is a part of a sewerage and a sewerage is a part of a sewage.

The simplest way to explain the two different words is this – sewage is the waste that is produced by people while sewerage is the structure that holds the sewage within its “stomach.” In the end, it is only us humans and the rain that uses these systems, and we need to make sure that these two things will be used correctly in our lives, making sure to clean the area properly, separating water-type waste and solid-type waste, so that it – the waste water – would be easier to recycle.

At Drainage NZ, we help you with your sewer and sewerage needs. We have over 20 years of drainage experience! We are experienced, qualified, and have all the toys to do anything that relates to drainage in New Zealand.

What Is Butt Welding and How Can It be Used Effectively?

There are several ways to attach two metal pipes together.  To choose which one to use, you must decide based on what is best or needed for the job at hand therefore it is vital to understand each method.  These methods are:

  • Threaded
  • Stab-type Fittings
  • Soldered
  • Brazed
  • Welded – Which has two types, namely : Butt Weld and Socket Weld
  • Saddle Fusion

Among these, Butt Welding is the most common of pipe welding joining methods.  This is commonly used for pipes which generally shares the same diameter.  This method is also most popularly used in commercial and industrial pipe systems. 

What Is Butt Welding?

Butt welding is when two pieces of metal pipes are joined together within the same plane.  This method requires some preparation and is used mostly for thin metal sheets, which need to be welded in a single pass.  This technique can be automated or it can be pieced together by hand on to the steel pieces.  Brazing can also be done under this method for copper pieces.  This method is used to attach two metal pieces such as pipes, framework in factories, and in flanges as well.

The butt-welding method is the preferred type for commercial purposes since it is more economical, as well as providing a strong fusion of the two metal pieces.  Also, it uses the least amount of welding materials and at the same time giving out a strong weld.  The automated butt weld process is the more favored process because of its ease of preparation and there is a low chance of adjustments in cases of non-ideal joint preparation because of the absence of human guidance.  It is expected that butt welds have the strongest welds with the least amount of imperfections. 

How Can Butt Welding be Used Effectively?

Butt welding is used when directional drilling so as to avoid joiners from sticking out thus making the thrust difficult.  A smooth flush finish outside the pipe is needed to enable the thrusted pipe to be pushed through without getting stuck.  Also this method does not need the metal piece to be welded together by having to bend everything and reinforce the structure which can then cost more than just welding two metal pieces together through this method. 

This method works best with MIG or TIG welding applications because of its ability to connect two metal pipes.  This method can be done by pressing the ends of the material together while a current is passing through them.  The temperature between the materials is high which softens the metal into a plastic-like state which them makes it fuse together.  When using this technique, it should also be noted that the diameter and thickness of the pipes and fittings should be equal as well as the material used. 

Advantages of Butt Welding

There are several advantages of butt welding among these are:

  1. It assures of its permanent leak proof quality and strength. 
  2. Having a continuous steel structure between the pipes and fittings gives the piping system better strength.
  3. The pipe fittings when used using this method gives out a smooth surface and a gradual directional changes thus making it decrease the pressure losses, the turbulence of the system and protecting it from corrosion and erosion.
  4. This method is more economical, which does not hurt the budget.
  5. Butt welding joints also offer smaller space in the system. 
  6. A weld can be made using this method in a wide range of sizes and complex shapes although both ends should be equally matching. 
  7. This can be used in a wide range of materials such as steels, stainless steel, aluminum alloys, nickel alloys or titanium. 
  8. Solidification cracking and porosity is usually not an issue.
  9. The butt welding process can be automatic or semi-automatic and monitoring of the welding process can already indicate the quality of the work.

How Can Drainage NZ Help?

Drainage NZ’s over 20 years of experience in this field can provide services together with their qualified drain layers. The team is certified, qualified, and registered, therefore, assuring clients that only the best services are offered with the highest of standards and in compliance with NZBC standards. 

Services include all aspects of drainage, such as driveway cesspits and channels, drain repairs, and drain unblocking in both residential and commercial drainage work.  Aside from these, the company is also offering its services in general plumbing and gas fitting works. 

Drainage NZ offers services in directional drilling works.  Their services include water distribution piping, fire protection lines, sanitary sewer piping, storm sewer drainage piping, gas distribution piping, landfill applications, irrigation applications, and electrical/telecommunications. 

There are also several reasons why horizontal directional drilling is used. One of the reasons is that there is lesser traffic disruption.  It also offers lower costs since there is no labor or concrete reinstating.  There is also a possibility for deeper installation, long installation is possible, job can be completed for a short period of time and lastly, it is safer for the environment.

For more information, just visit our website.