Hector Peterson Secondary

In late July 2017, the Shoprite Act for Change team gave Bridgiot the go-ahead to pilot our water saving technology at two schools, one of which, is Hector Peterson Secondary in Wallacedene.

Hector Peterson is a zero-fee (section 20) school with over 1200 students.

In the middle of August, meetings were held with the principal, Mr Mavovana, and a smart water meter was installed to capture consumption data. The principal was keen, since the school had a big utility bill.

This was also our very first school installation running on only batteries using Sqwidnet’s new Sigfox wireless technology.

The average consumption per weekday for the school was measured to be 47kL, while the average weekend day was measured to be 37kL. The minimum flow for the midnight hours was 2.3kL/hr, and 1.4kL during the weekend daytime. The flow peaked at 2.5kL/hr during weekdays. There was very little variation in the flow, indicating that the school had significant leakages/losses.

On the 1st of September, the team visited the school to inspect the pluming and to determine where the water was going. It was clear that the toilets and leaky valves were the main problems, with about 20 of the 40 toilets malfunctioning. The problem ranged from flushers that were stuck open, to float arms that were bent and that never closed.

On the 12th of September, the plumbing work was completed by an eager CBD Plumbing to replace the plumbing of 20 of the toilets and to replace the faulty valves. Immediately following the installation, the peak weekday flow rate dropped to 1280 kL/hr, with the valves open (a reduction of 49%).
Since the complete intervention, the consumption dropped to 13kL per weekday, a 72% reduction for weekdays, and 100% reduction for weekend days (providing the officials remember to close the valve). With these reductions, the monthly bill will reduce by R 46,000/month.

The final step was a behavioural intervention, in which the principal and children were given access to the consumption information, including daily consumption, nightflow losses, and time-of-use consumption information. After this information was introduced, the consumption dropped to an average of 4kL per weekday, but then increased slightly and stabilised at 7kL per day on average. This amounts to a total saving of more than R 50,000 per month.

Toilets before intervention

A weekday before intervention (52kL/day). Notice the y axis is at 2500 litres.

Weekday during application of intervention (13kL/day). Notice the y axis is at 2200 litres.

Weekday after final intervention (4kL/day). Notice the y axis is at 600 litres.