How deep should underground drains be?

In order to carry the flow and to avoid blockages, the drain or sewer that you intend to connect to generally needs to be at least 0.8m lower than the ground floor level. If it is less than this, you should seek advice from a builder, architect or drainage engineer.

What is underground drainage system?

Underground Drainage System minimizes the risk of water flooding at your property. The underground drainage system ensures that wastewater is flushed out of the site which further reduces the risk of contamination of water. The best pipes for building strong Underground Drainage System are Foamcore Pipes.

What is the minimum fall for underground drainage?

A 110mm foul drain taking the discharge of less than 1 l/s should be laid at a 1:40 (25mm per metre) fall. A foul drain taking the discharge from a minimum of one WC can be laid at 1:80 (12.5mm per metre).

What are the types of drainage systems?


  • Surface drainage systems.
  • Subsurface drainage systems.
  • Main drainage systems.
  • Main drainage outlet.

How do you install underground drainage?

  1. STEP 1: DIG TRENCHES FOR DRAINAGE PIPE. BEFORE digging, CALL 811 to have utility lines marked.
  2. STEP 2: ASSEMBLE AND PLACE THE CATCH BASIN. Now that the trench is dug, you can assemble the catch basin.

Can you put a bend in underground drainage?

Simply enough these are the changes of direction on a drainage system which are usually available from 11 ¼ to 90 degree in most materials, long and short radius bends are available and they can be plain ended as shown below left (clay) or single or double socket (underground plastic).

Can underground drainage be used above ground?

Above ground PVCu drainage pipe and fittings can only be used above ground. They will function if installed underground, but are not manufactured to the correct standards for this application, Building Regulations Part H state that PVCu materials for below ground gravity drainage should be to BS EN 1401 or BS EN 13476.

How much fall does a sewer line need Australia?

All main drains must be laid at a minimum grade of 1.65%. A drain of DN 65 must be laid at a minimum grade of 2.50% or a ratio of 1 in 40.

What is the fall of a 4 inch sewer pipe?

The minimum slope for a 4-inch PVC gravity flow sewer pipe is 1/8 inch per foot.

What are the 3 types of drainage?

The types of drainage systems will allow you a better comprehension of their roles and how they work together.

  • Surface Drainage System. Surface drainage systems remove excess water from the land’s surface through channels or ditches.
  • Subsurface Drainage System.
  • Slope Drainage System.
  • Downspouts and Gutter Systems.

How do I put drainage in my garden?

Here are some ways to improve your garden’s drainage.

  1. Pricking, slitting or spiking.
  2. Grow more plants.
  3. Build raised beds.
  4. Improve soil drainage.
  5. Manage surface water.
  6. Use bark chippings.
  7. Install artificial grass.
  8. Install land drains.

Why do you need Wickes underground drainage system?

UNDERGROUND DRAINAGE Wickes stock a wide range of drainage products, whether it’s to replace old drainage systems in the event of collapse, or install new during home improvements. The purpose of this leaflet is to provide you with basic details on what you may find underground.

Where do we get our drainage fittings from?

We source our Underground Drainage Pipe and Fittings from UK and European manufacturers. All products are tested, approved and kite marked to prove their quality and acceptability for use in the UK. They are selected for their mix of high quality and low price making these fittings the best bang for buck possible.

How big is an underground floplast drainage system?

Underground Drainage FloPlast’s Underground Drainage system is available in 110mm & 160mm. The system is designed for use in gravity drainage and sewage installations at depths of up to 4 metres for 110mm and 3 metres for 160mm.

What are the requirements for a drainage system?

Statutory requirements The following standards deal with drainage design: BS EN 752: Drain and sewer systems outside buildings. BS EN 1610: Construction and testing of drains and Sewers.