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Calculating Emergency Storage For Sewage Pumping Stations

Home » Calculating Emergency Storage For Sewage Pumping Stations

Sewage pumping stations need to be able to store 24-hours’ worth of maximum sewage inflow in the event of pump failure. This requirement is set in stone by building regulations and is a critical part of pumping station design.

The calculation itself thankfully, is quite straightforward. All you need to know is the nature of the development and the number of occupants. Once you have that information you can consult the British Water’s Flows and Loads document to see how much wastewater each occupant will generate over a period of 24 hours. Below shows a couple of common occupants.

Domestic DwellingsFlow (litres per day)
Standard residential150
Mobile home type caravan with full services150
Office/factory without canteen50
Office/factory with canteen100
Open industrial site e.g. construction, quarry, without canteen60
Full-time day staff90
Part-time day staff45

Then the calculation is as follows:
Number of occupants x flow (litres per day) = 24-hour emergency storage volume
For example, if a 3-bedroom house with a maximum occupancy of 4 people required a pumping station the 24-hour storage calculation would be:
4 occupants x 150 litres per day = 600 litres 24-hour emergency storage
So, in this instance a pump chamber would need to be selected with a minimum volume of 600 litres. Ideally however this volume should be stored below the lowest invert into the wet-well in order to prevent surcharging the incoming pipework.
If you’re looking for more information or even some assistance with your pumping station requirements, please feel free to contact our engineering team on 0113 2860813 for free advice.