The Bishop Building on the Saint Francis South campus, honoured by AGC of Oklahoma with a 2010 Build Oklahoma Award, has been cited as the first registered LEED (Leadership in Energy and Environmental Design) Gold Certified project in Oklahoma. The LEED Gold Certification was awarded by the U.S. Green Building Council in September. Gold is the second highest level. It is the first gold-certified health-care facility in Tulsa; there are only two in the state and a handful in the United States. The Bishop Building is a five-story, 110,000-square-foot medical office building and a multilevel parking structure. The building includes an enclosed bridge connector between the hospital and the building. Rainwater is filtered, stored and then used for irrigation of the native landscape plants

Project data

Roof area 8.370 ² Rainwater Storage Tank 190 m³

3 x WISY Vortex Filter WFF 300 Filter mesh size 0.38 mm

Drainage safety according to DIN EN 752, meets DIN 1989 

Annual savings Harvested Rainwater 8.900 m³ Reduced Water Bill 8.900 US $ Completed in 2010



Example of use of WISY filter technology Haus der Deutschen Wirtschaft, Berlin/Germany The central associations of the German economy, the German Chambers of Industry and Commerce (DIHK), the BDI Association – Voice of German Industry and the Federal Association of German Employers (BDA), have moved into offices in Mühlendamm, in the Berlin-Mitte district. 570 employees work here. The initiative shown by the owners of the building to invest in rainwater harvesting and rainwater utilisation has been exemplary. Collected rainwater is used throughout the year to flush toilets in the parts of the building that are not open to the public. Supplies of water for the fire sprinkler systems are also guaranteed. In the first 21 months, rainwater provided 54% of the required quantity of 170 m³, while 46% was supplemented by drinking water, added whenever the tank was empty. The accumulated rainwater was used up almost entirely and the small amount of excess water was channeled directly into the River Spree.

Project data

WISY vortex fine filter, 2 x WFF 300
• Filter mesh size 0.6 mm
• Gegenbauer GmbH, Berlin Accumulating area 2,000 m² glass roof
• Gutter along glass roof with heating and syphonic roof drainage valves Tank
• Total volume 280 m³
• Volume for fire sprinkler system 70 m³