st paul’s panorama,
81 newgate street

81 Newgate Street has undergone a major refit into a modern commercial space, with water sustainability at its core. INDRATEC’s integrated system combines rainwater attenuation, rainwater harvesting, and greywater recycling into a single solution designed to maximise reuse and resilience.

The rainwater attenuation system uses a 300,000-litre basement tank with seven dedicated inlets. INDRATEC’s smart control panel reads live API weather data to forecast rainfall and calculates anticipated inflows up to 24 hours in advance. The system then pre-emptively drains the tank to ensure capacity is available ahead of storm events.

Within the same tank, rainwater harvesting is achieved using bespoke in-tank filters developed by INDRATEC. These allow for effective filtration without requiring additional plantroom space. The filtered rainwater is transferred to a clear water storage tank and used as a top up to the grey water system.

The primary supply to the building’s WCs is filtered water from the grey water recycling system, a membrane bioreactor (MBR) that treats water from showers and hand basins using ultrafiltration membranes. The system installed has a processing capacity of 12,000 litres per day to meet the building’s demand.

Together, these systems enhance water resilience while reducing environmental impact, supporting the building’s performance against BREEAM and LEED sustainability targets.