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2012 Conference Technical Tours
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Leave Hotel @ 8:00 am

Hospice of Wake County:
Rainwater Harvesting System

5480 Trinity Road
• Rain Water Solutions, Raleigh, NC.

• Client: Hospice of Wake County,
250 Hospice Circle, Raleigh, NC

• Objective: Design and install a rainwater harvesting system that will supply non-potable water for the irrigation system for Hospice of Wake County's new campus on Trinity Road in Cary, NC. Every patient room will open onto a garden so a constant supply of water is needed to keep the gardens lush and growing.

• Feasibility: Hospice of Wake County is a commercial site at Trinity Road and I-40 in between Cary and Raleigh, NC. The total impervious collection area is approximately 157,000 ft2 or roughly half the campus. The total rainwater collection potential based on 30-year averages is approximately 292,000 gallons per month or 3.5 million gallons annually. Water to be used for landscape irrigation, non-potable uses only.

• The Estimated Design notes: A modified rain garden will be constructed at the bottom of the dry detention pond and an underground matrix cistern below the rain garden. The rain garden will not negatively affect the hydraulic performance of the dry pond. Water filters through the garden and into the cistern by way of stormwater pipes. The system removes sediment and metals, but not nitrogen. Nitrogen in the water will benefit the plants being irrigated. The system will also remove pathogens at a fairly high rate. No additional disinfection system is necessary.

• Update: The system was completed in spring 2009 and has supplied water for the irrigation system since then. Maintenance includes keeping pond turf cut, cleaning any trash from forebay and monitoring the water filter on pressure side of pump.

NC Museum of Art
2110 Blueridge Road
The Pond, North Carolina Museum of Art

• Made possible by the North Carolina Clean Water Management Trust Fund

• Site, stormwater and water quality design: ArtifexED, Inc.

• Landscape design: Lappas + Havener, PA

The Museum Park is a living laboratory for exploration art, contemporary design and environmental management. This constructed landscape is designed to manage water flow from a 50-acre drainage including the new West building, housing the Museum's Permanent Collection of Art.

The Pond's rocky swale and curvilinear terraces slow run-off from storms and filter water through porous soils, wetlands, and open water. Its design exposes and reveals the process of removing pollutants and reducing runoff from the Museum as it enters the streams that flow into the Neuse River and ultimately to the coast.

The new West building is connected to this pond. Rainfall is collected from the building's roof and from bio-retention zones and stored in a 90,000 gallon cistern. Excess water, not needed to irrigate the sculpture garden, flows through the swale and into these terraces to the wetland.

The rock-strewn swale slows water flowing down from the amphitheater and ridge under this bridge. The clay-colored structures in the terraces are points of entry and movement as water flows through the system. As the flat terraces fill with runoff, they drain through porous soil, filtering out pollutants from water flowing into the pond. The wetland and deep water pools provide settling for sediment and other solid particles, and aquatic plants that filter and remove pollutants.

Raleigh Fire Department # 6:
2601 Fairview Road

• City of Raleigh Stormwater Services Department – 2010

• NC State Bio and Ag Engineers – Design

• Contractor – Cape Fear Rain Water Harvesting, Inc.

The City of Raleigh Fire Station Rainwater Harvesting Project was initiated in 2009 by the City of Raleigh Stormwater Services and funded by the American Reinvestment and Recovery Act ( ARRA ). The project included 28 cisterns at 11 Fire Stations throughout the Raleigh, NC area. The collected rainwater controls stormwater runoff and is utilized for outdoor utility; irrigation and filling of fire truck booster tanks. The systems utilize a pump and frost-free hydrant for efficient uses. Fire Station #6 stores a total of 3,000 gallons of rainwater utilizing 2 1,500 gallon PE tanks.

The tanks are wrapped in pressure treated lumber with stainless steel straps and roofs. NC State Bio and Ag Engineering has incorporated a monitoring program the past two years and updates the results regularly. A bio –retention cell was installed at Fire Station #6 and at several of the other station sites to control runoff from impervious areas at grade as well.

The Market at Colonade (Box Lunch provided)
9200 Strickland Road (Parking)

Regency Centers' Market at Colonnade (Colonnade) project is an in-fill retail development surrounded by a mix of office and residential uses in North Raleigh, NC. The Colonnade project is unlike any other within North Carolina with regard to its approach to stormwater management.

The Innovative Stormwater Management Plan (ISMP) includes three cisterns (totaling 43,000 gallons) which collect rooftop runoff. These, in conjunction with a subsurface gravel and pipe trench system retain the first 1-inch of runoff which is then infiltrated into the underlying soils. Surface runoff from the site in excess of the 1-inch storm is similarly captured, pretreated (removing oil, sediment and debris), and temporarily stored in the 65 foot x 185 foot x 4 foot high underground retention chamber holding an additional 350,000 gallons of rainwater.

Harvested rainwater from the Whole Foods' roof is stored in an 11,700 gallon cistern and used inside the store for toilet flushing. Additional rainwater stored in two underground cisterns (31,300 gallons) is used for landscape irrigation. Surface bioswales and bioretention area allow for additional stormwater treatment. These devices also provide additional localized infiltration capacity to support groundwater recharge.

Return Hotel @ 12:15

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