What Hydraulic Engineering Issues Commonly Occur in Commercial Buildings?

Unless they start to cause trouble, most building owners don’t think much about the hydraulic systems in commercial buildings. The water runs, the toilets flush, and the fire sprinklers stand ready in case of emergency. That’s exactly how it should be. When it’s working perfectly, it’s invisible.

But when something goes wrong with hydraulic systems engineering in a commercial setting, it’s all hands on deck. This is a big, complex system with many interlocking parts that can shut down your building, create a compliance nightmare, or release a very expensive flood.

This is why hydraulic engineering consultants exist. We’re here to oversee the build stage and make sure that doesn’t happen. This list is dedicated to the most common commercial building hydraulic issues we encounter, so they can become known and avoidable, rather than a total unknown.

What are hydraulic systems in commercial buildings for?

Before we dive into the most common issues, let’s start with the basics.

In the simplest terms, hydraulic systems engineering is the science of moving fluids into, through, and out of a building safely and efficiently. While residential plumbing serves a few bathrooms and a kitchen, hydraulic systems in commercial buildings must handle heavy loads, high pressure, and strict environmental regulations.

There are three pillars of hydraulic engineering in this context:

1. Stormwater

This involves managing rainwater runoff from roofs, podiums, car parks, and surrounding surfaces to prevent flooding, ponding, and damage to the building or wider site infrastructure during heavy rainfall events.

2.  Drainage

This focuses on the safe removal of wastewater and trade waste from the building. Effective drainage design helps prevent blockages, odours, contamination, and operational issues, particularly in commercial kitchens, industrial spaces, and high-use facilities.

3.  Supply Water

This involves delivering clean, reliable water throughout the building with the correct pressure, flow, and infrastructure to support kitchens, bathrooms, plant, and operational requirements across every level.

Within these three pillars of hydraulic systems engineering, things don’t always go to plan (usually due to a lack of expert oversight in the build stage). Here are the most common commercial building hydraulic issues we see across New Zealand.

1. Inconsistent water pressure.

In a large building, gravity is your biggest enemy. If you’re on the 10th floor, you need booster pumps to get your water; if you’re on the ground floor, that same pressure can be so high it literally rattles the pipes and blows out the tap washers.

Poorly calibrated pressure-reducing valves (PRVs) or failing booster pumps are usually the cause of the pressure, meaning occupants of the building either deal with pathetic showers or terrifyingly loud water hammer, with very little in between. This does a good amount of premature damage to the entire system.

2. Backflow prevention failure.

Backflow prevention is extremely important, as it prevents contaminated water from being sucked back into the clean urban water supply. If the engineering team is working with missing or uncertified prevention devices, you’re open to a major public health risk.

Councils are incredibly strict about this, and failing a yearly IQP inspection due to this issue can lead to hefty fines or water disconnection for the entire building to preserve public safety. This is why it’s so important to know what building services engineering involves, and to bring the right expertise in at the right time. It will save you thousands.

3. Trade waste and grease trap issues.

If your commercial building has any kind of built-in food court or restaurant, you have a trade waste system. This system, improperly engineered, can throw a number of issues your way due to improper hydraulic system engineering.

For example, undersized grease traps or poorly designed drainage gradients can cause fat, oil, and grease to solidify in your pipes. At its worst, this can cause raw sewage to back up into public areas. Not only is this an enormous health risk, but it’s also expensive to resolve and a big blow to your building’s reputation.

4. Ageing infrastructure and corrosion.

Hydraulic systems in commercial buildings across New Zealand span decades, and many older buildings are still running on pipes that have seen better days. Internal corrosion in these galvanised steel or copper pipes can cause pinhole leaks throughout the building.

Not to mention, if the water isn’t kept at the right temperature or circulated properly, it can harbour dangerous bacteria. This is where hydraulic engineering consultants become a vital resource for checking on the health of your system.

As you can see, most commercial building hydraulic issues are rooted in a fundamental design flaw instead of ongoing wear. This is good news, in a way, because it means these issues are preventable if you have the right experts on-staff.

When you look for hydraulic systems engineering expertise, you’re bringing on a team with the future in mind. We want to ensure that the pumps, pipes, and waste systems are designed to handle what your building is rated for today and ten years from now.

Choose the experts in hydraulic systems engineering. Choose Agile.

The team at Agile Engineering contains a diverse range of experts across all engineering disciplines. We are here to ensure your project goes up flawlessly and lasts for decades.

If you’re designing or building, get in touch with our hydraulic engineering team to bolster your on-site expertise.