Tesco Case Study

Home Tesco Case Study

DVS continue to assist in reducing national supermarkets water consumption

Throughout many years, Dart Valley Systems continue to improve washroom facilities and assist in saving water and money across Tesco stores nationwide.

Tesco Southbury Road, Enfield was highlighted to be surveyed to find out how much water was being consumed and if any savings could be made.

A site survey was completed and detailed recordings made.
It was clear that savings could be made at this store by fitting DVS products.

During the survey, it was recognised that savings could be made on push taps and WC flushing. Urinals already had controls fitted.

Taps

The push taps installed in the washrooms were running longer than required. DVS recommended automatic taps as the lifetime is longer and potentially, up to 30% savings can be made. Even though flow rates may be similar, automatic taps will only run when they are detecting hands. See table below detailing estimated savings at this store when using automatic taps.

Push Taps
Water usage with existing push taps running at 5LPM with auto tap with 30% less run time saving 365 days
Times used per day for 1 minute – 5LPM M³ used per year at 1minute – 5LPM &M³ saving per year at 30% reduction (estimated at 30% less run time for tap. Also no sticking taps). £ saving per year at ave. £2.00m³ Cost of auto tap inc. fitting Payback in years
20 36.5 11.0 £21.90 £212.75 9.7
25 45.6 13.7 £27.38 £212.75 7.8
30 54.8 16.4 £32.85 £212.75 6.5
35 63.9 19.2 £38.33 £212.75 5.6
40 73.0 21.9 £43.00 £212.75 4.9
45 82.1 24.6 £49.28 £212.75 4.3
50 91.3 27.4 £54.75 £212.75 3.9
WC Flushing
Existing 9 Litre cistern with Flushvalve using 6 Litres per flush – 365 days per year
Times flushed per day – per WC Times flushed per year M³ saving per year at 3 Litres per flush £ Saving per year at ave. £2.00m³ Cost of Flushvalve inc. fitting Payback in years
20 7300 21.9 £43.80 £214.50 4.9
25 9125 27.4 £54.75 £214.50 3.9
30 10950 32.9 £65.70 £214.50 3.3
35 12775 38.3 £76.65 £214.50 2.8
40 14600 43.8 £87.60 £214.50 2.4
45 16425 49.3 £98.55 £214.50 2.2
50 18250 54.8 £109.50 £214.50 2.0