Drainage services

Ensuring drainage systems work effectively is key to minimising downtime and protecting against health and other environmental issues. Our expertise and state-of-the-art equipment supports efficient, compliant drainage networks and guards against potential health and environmental hazards, meaning fully operational and compliant drainage networks. Common causes of blocked drains can be seen below.

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Key services:

  • Cleaning & jetting
  • Drain testing
  • CCTV surveys
  • Rehabilitation works
  • Flow & load surveys
  • Impermeable area surveys
  • Topographical surveys

The most obvious cause of blocked drains is debris. Whether this debris is foliage, twigs or other natural materials that have been naturally displaced, or foreign materials introduced by human activity, like soaps, toilet tissue and sanitary towels, and waste food; they all have the capacity to obstruct the flow of water between drains and the pipes that run underneath. This isn’t usually an immediate problem, as water can often still pass through minor obstructions. A drain that has been left to accumulate debris over a period of time will eventually become completely blocked.

Grease traps and interceptors have become an integral requirement of drainage systems for any premises involved in the food sector. This includes restaurants and bars, delicatessens, take-aways, hotels, food halls and outlets, canteens, coffee shops, service stations, hospitals and public buildings.

They are critical part of the drainage infrastructure, ensuring that fats, oils and greases (FOG) do not enter our drains and sewers. This can lead to blockages and flooding and forces raw sewage into premises, onto roads and into rivers and streams causing environmental and public health incidents. FOG is one of the main contributing factors to the recent phenomenon of Fatbergs.

Grease traps and interceptors collect, and hold contaminates including fats, oils and greases allowing wastewater to be discharged safely and compliantly. Regular cleaning and maintenance are vital for environmental compliance and clean working conditions. 

Enva’s experienced drainage teams clean grease traps and interceptors and manage all waste generated during the process. The frequency of the cleaning will vary from site to site and our experienced personal can advise on timings and biological maintenance solutions.

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Higher than average rainfall not only causes issues with flooding due to excess water run-off, the resultant collection of leaves, mud, dirt and other matter also finds its way into drainage systems and can cause blockages. The majority of drains (storm drains aside) are not built to handle excessive amounts of debris, which makes blocked drains after heavy storms commonplace. Blocked drains outside properties are likely to cause localised flooding, which can cause damage to properties if left for a prolonged period of time.

Drainage relies on gravity to transport water from one place to another. Water won’t flow uphill, so pipe installations need to be correctly installed and feature adequate falls to ensure continued water flow and that particles of debris don’t start to build up. Early warning signs of bad water flow include slow draining water, gurgling sounds from flushed toilets, and bad smells emanating from sinks and drains.

When pipes become cracked and break, water is unable to flow freely, which may cause the pipe to collapse and the drain to become blocked. The causes of broken pipes can be through simple old age, or they could have been incorrectly installed; alternatively, pipes can be damaged by tree roots, which can cause a lot of damage before the problem is identified. Underground pipe repairs can be expensive and hugely disruptive, depending on how easy or difficult it is to access the area that’s broken.

The simplest method of clearing a blocked drain, and the first a conventional plumber may deploy, is called drain snaking. A drain snake (a.k.a. a drain auger) is a length of cable with an ‘auger head’ that’s sized appropriately for the pipe to be unblocked, and can locate and remove blockages fairly simply. While drain snakes are able to reach fairly deep into sewage and water pipes, sometimes blockages are too severe to be tackled in this manner, meaning other more advanced cleaning methods will need to be deployed.

The preferred method for removing blockages from drains and pipes is called drain jetting (a.k.a. hydro-jetting). This process uses a stream of highly pressurised water, much like a pressure washer, along with a special head that directs the spray and scours the inside of commercial drains as it moves along the pipe, clearing even stubborn blockages in the majority of cases. This method is often preferred as it is proven to be the most effective at clearing blockages almost instantly, causing minimal disruption and without any backflow; and it is especially preferred for clearing blocked drains associated with the food, beverage and hospitality industries, where there’s likely to be a high incidence of troublesome oil, grease and fats clogging the drains, as well as fibrous and food materials.

It’s a good rule of thumb to have your drains professionally cleaned at least every three years, preferably more frequently. Drain cleaning should also be undertaken following any instances of extreme weather. Enva are commercial drain maintenance experts, and offer a range of drain services from drain testing, to drain cleaning and jetting, helping you keep your business running smoothly.

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