Federal Center South Building 1202
SENV 7006
Water System
The The site of the federal center building 1202 is surrounded with infiltration and evaporation swales. A variety of systems are used in the building to conserve and manage water.
Water Flow System
Qualitative
Water Flow System
Water System & Environment
Large rocks within the atrium serve as water features, inspired by the tributaries of the Duwamish Waterway. During rain events, storm water flows through stream channels chiseled in the stones, providing a direct tie to the climate and surrounding environment.
Water features
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 Federal Center South Building 1202 |
Quantitative
Annual Water Use (Modeled)
200,000 gallons building water use, 1.5 million gallons of irrigation water use, 2.2 million gallons of cooling tower water use. (Actual water use is not available due to insufficient data from meter readings.)
The site retains the 95th percentile rain event, and treats 99% of the annual runoff. Roof water is captured and retained in a 25,000 gallon cistern for reuse.
Water Harvesting System
The rainwater harvesting system can help reduce potable water demand. Approximately 430,000 gallons of rainwater will be harvested annually and it can provide a 79% reduction in potable water use for toilet flushing as well as a reduction of irrigation demand by an additional 14 percent. In addition, potable domestic water use is reduced by 58 percent through efficient fixtures, low-water landscape and rainwater reuse.
Metrics
Percent reduction of regulated potable water: 79%
Is potable water used for irrigation: Yes
Percent of rainwater from maximum anticipated 24 hour, 2-year storm event that can be managed onsite: 100%
Water Use Reduction Strategies
The storm water flow system eliminates the need to connect to the already overtaxed municipal sewer system.
On-site drainage run-off is treated and infiltrated within storm water surface ponds, rain gardens and wet ponds. The runoff is collected around the perimeter of the site and directed to the western-most pond, mimicking natural site drainage patterns, and leveraging low-impact development techniques. The rainwater reuse system captures water from the roof and stores it in a 25,000-gallon cistern and treats it prior to being used for toilets, irrigation, a rooftop cooling tower and water features in the atrium. These systems will provide required water quality treatment. A series of exterior rain gardens were designed to drain and treat a 95th percentile rain event, entirely on-site eliminating the need for a connection to the city’s overtaxed storm water system.
The Native and adaptive plantings reduce irrigation demand and provide habitat opportunities along the industrial waterway and complement ongoing efforts to restore ecosystems as the Duwamish enters the Puget Sound.
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