rainwater harvesting case study ebook

Contech RWH Case Book | 1Rainwater Harvesting

ENGINEERED SOLUTIONS

Using Rainwater

Harvesting to Enhance

Low impact Development and

Green Infrastructure Design

A collection of case studies that

demonstrate how rainwater harvesting

contributes to LID/GI design

RWH Case Book

2 | Contech RWH Case Book

Rainwater Harvesting as a Low impact Development/Green Infrastructure Strategy

Urban stormwater planning has two primary objectives – controlling water quantity to minimize downstream erosion and flooding and controlling water quality by preventing pollutants from impacting our waterways.

Low Impact Development and Green Infrastructure take this a step further by seeking to mimic predevelopment hydrology and keep runoff on site. A growing number of specifiers are accomplishing this by using rainwater harvesting as an integral part of their stormwater management/runoff reduction strategy. The growing use of rainwater harvesting is not surprising, as it not only reduces runoff, it turns a pollutant into a resource. Rainwater harvesting keeps stormwater runoff on site, and harvested water can be used for irrigation, toilet flushing, cooling tower make-up water, and it reduces demand for potable water.

These case studies are real examples of how rainwater harvesting is used in a variety of applications as a Low impact Development/Green Infrastructure. Applications include:

• Anarboretumusingcapturedrainwaterforirrigation

• Apublicutilityfacilityusingharvestedwaterforwashdownwater

• A manufacturing facility that uses rainwater harvesting to meet local low impact

developmentregulations

• An apartment complex that uses rainwater harvesting as part of a sustainable

environmentdesign

• Apublicparkthatreducedbeachpollutionbyusingharvestedwaterforirrigation

Contech RWH Case Book | 3

UrbanGreen® Rainwater Harvesting (RWH) Case Book

Table of Contents

Dallas Arboretum - Dallas, Texas ...................................................................................................4

» A sustainable arboretum uses captured rainwater for irrigation

Yakult Manufacturing - Fountain Valley, California ...........................................................................5

» A manufacturing facility uses rainwater harvesting to meet local low impact development regulations

Oceano Warner Center - Woodland Hills, California .......................................................................6

» An apartment complex uses rainwater harvesting as part of a sustainable environment design

South Transfer Station - Seattle, Washington ...................................................................................7

» A public utility facility uses harvested rainwater to keep facility clean

Taylor Yard Transit Village - Los Angeles, California .........................................................................8

» Mixed-use development uses rainwater harvesting to maximize land space

Alta Vista Park - Redondo Beach, California ..................................................................................10

» A public park reduces beach pollution by using harvested water for irrigation

Chick-fil-A - Fort Worth, Texas ......................................................................................................12

» A national fast food chain uses rainwater harvesting to achieve LEED certification

Westfield Century City Parking Structure - Century City, California ...................................................13

» A city parking structure uses rainwater harvesting to meet local Low Impact Development regulations

City of Springfield Sewer Garage - Springfield, Illinois ...................................................................14

» A city parking structure uses rainwater harvesting to meet local Low Impact Development regulations


Dallas Arboretum - Dallas, Texas

“Contech worked with engineers at Pacheco Koch to design a system consisting of a CDS

hydrodynamic separator, two DuroMaxx SRPE cisterns, and mechanical pumps and controls.”

Owner: DallasArboretum

Engineer: PachecoKoch

Contractor: C-ConServicesInc.

UrbanGreen® RWH System: • CDS®hydrodynamicseparator

• (2)DuroMaxx®SRPEcisterns

• Mechanicalpumpsandcontrols

The Dallas Arboretum’s Rory Meyers Children’s Adventure Garden is a fun nature and science gateway for children of all ages. The Gardens’ unique blend of innovative technology, found in the 150 interactive exhibits spread over 8 acres, entertains and educates visitors on concepts such as photosynthesis, pollination, the solar system, erosion, and energy.

The garden also incorporates many sustainable features such as recycled materials, planted roofs to reduce heat, low-flow plumbing, solar panels, and an UrbanGreen® rainwater harvesting system from Contech Engineered Solutions that provides water for irrigation.

Contech worked with engineers at Pacheco Koch to design a system consisting of a CDS hydrodynamic separator, two DuroMaxx SRPE cisterns, and mechanical pumps and controls.

The CDS provides pretreatment for the runoff. Pretreating stormwater prior to storage protects downstream pumps, filters, and fixtures from damage or clogging, and lowers cleaning and maintenance costs by keeping pollutants out of the cistern and mechanical system. It also reduces the amount of organic matter and biological oxygen demand (BOD) in the cistern, decreasing the likelihood of creating anaerobic conditions and associated odors.

Footprint constraints required the use of the two 96” dia. DuroMaxx® cisterns providing 50,000 gallons of storage. With its combination of steel reinforced polyethylene construction and watertight joints, DuroMaxx is the perfect choice for rainwater harvesting applications. Once the cisterns reach full capacity, the remaining stormwater runoff will discharge into White Rock Lake.

Contech also provided an integrated system that included all the mechanical pumps and controls; including an exterior cabinet, pump, 100 micron screening filter with auto flush, and a system controller with level monitoring and city water makeup control.

“We have been working with Contech for years and have had good success with their products, and appreciate their design assistance” said James Koch, Vice President of Pacheco Koch.


Yakult Manufacturing - Fountain Valley, California

“Construction of the new facility called for the design and construction of a stormwater management system that would meet local

Low Impact Development (LID) regulations.”

Owner: YakultManufacturing

Engineer: JosephC.Truxaw&Assoc.

Contractor: KanaPipeline

UrbanGreen® RWH System: • (2)CDS®hydrodynamicseparators


• (2)Mechanicalpumpsandcontrols

Fountain Valley California is the site of the first U.S. manufacturing plant for probiotic drink manufacturer Yakult. The facility consists of three buildings, including a 76,828 square-foot manufacturing plant, a single-story 11,221 square-foot office building, and a future 10,716 square-foot storage building. Construction of the new facility called for the design and construction of a stormwater management system that would meet local Low Impact Development (LID) regulations.

Consulting engineer Craig DiBias of Joseph C. Truxaw & Associates and landscape architect Dan Selig of Valley Crest Landscape Architects worked with Contech Engineered Solutions to develop two rainwater harvesting systems. These systems capture and reuse runoff from roof tops, parking lots, and other impervious surfaces and use the runoff for irrigation.

Each system consists of a CDS hydrodynamic separator for pretreatment, a DuroMaxx SRPE cistern, and mechanical pumps and controls. The east system consists of four barrels and contains 696 linear feet of 48” dia. DuroMaxx, while the west system consists of five barrels and utilizes 520 LF of 48” dia. DuroMaxx.

One of the obstacles that had to be overcome was the presence of high ground water. Engineers had to ensure ground water could not enter the cisterns. The watertight welded couplers of the DuroMaxx cisterns provided the confidence that ground water would not drain into the cisterns. Buoyancy calculations provided by Contech also showed the systems would not float due to the high groundwater. Contech also provided value by meeting with the engineer, architect, and owner to explain the National Pollutant Discharge Elimination System (NPDES) process.

“Contech gave us the ability to get a complete packaged solution, with all the components from a single source,” said Craig Di Bias of Joseph C. Truxaw & Associates. “Contech is known for standing behind their products.”

The project won the ENR Award for Southern California’s Best Manufacturing Project in 2014.


Oceano Warner Center - Woodland Hills, California

“Rainwater harvesting was chosen to control

stormwater as it provided the runoff reduction required

by the City of Los Angeles.”

Owner: TDIRealEstateHoldingsLLC

Dune&RealEstatePartnersLP

Engineer: KHRAssociates

Contractor: ARPipeline

UrbanGreen® RWH System: • (3)CDS®hydrodynamicseparators

• DuroMaxx®SRPEcistern

• Mechanicalpumpandcontrols

Built in 2012, Oceano apartments is a 244 unit, 5.8 acre community located in Woodland Hills, California, featuring outstanding architecture and design as well as a host of the most modern and cutting edge amenities. The goal of the development was to provide residents with a unique, sustainable environment and a neighborhood feel.

Water and energy conserving technologies and practices were incorporated into the site to reduce the community’s overall carbon footprint. This included an UrbanGreen® rainwater harvesting system from Contech Engineered Solutions.

The 3.57 acre site was challenging because it consisted of 85% impervious surface and included 48,778 SF of landscaping. Engineers at KHR originally looked at retention as a way to control stormwater, but upon further review, rainwater harvesting was chosen as it provided the runoff reduction required by the Community of Woodland Hills in the City of Los Angeles.

A Contech CDS® hydrodynamic separator was used to pretreat runoff collected from the roofs, surface parking and associated drive aisle, keeping organic material and other debris from damaging or clogging the system and to reduce maintenance costs. The treated water then flows to a 188,000 gallon cistern made from 500’ of 96” dia. DuroMaxx® steel reinforced polyethylene. DuroMaxx is an ideal choice for rainwater harvesting cisterns as it is strong, lightweight, and can be made in diameters of up to 120”. Contech provided all of the pumps and controls, providing a turn-key system from a single provider. Contech also provided KHR complete sizing, engineering, and installation support.

The stormwater management design also called for two additional CDS units to treat stormwater downstream, treating runoff from roadways not collected in the cistern. The CDS system uses continuous deflective separation to effectively screen separates and trap debris, sediment and oil from stormwater runoff.

Oceano Warner Center was honored as the Best New Construction in Los Angeles by the California Apartment Association and is LEED Silver Certified.


South Transfer Station - Seattle, Washington

“Harvested water will be used for irrigation, to wash the transfer

station floor, as washdown water for the tipping floor, and

for the wheel washing.”

Owner: SeattlePublicUtilities

Engineer: URSCorp,Inc.

Contractor: M.A.Mortenson

Construction,KLBConstruction

UrbanGreen® RWH System: • DuroMaxx®SRPEcistern

Seattle Public Utilities (SPU) built a new $50 million waste transfer station in South Seattle. The two-story, 140,500 square foot building with 84 parking spots replace the old South transfer station located across the street.

“The new facility will allow the city to maintain reliable solid waste services in an economical and environmentally sound manner,” said Henry Friedman, project manager for SPU.

SPU’s goal was to build this project to the standards of the U.S. Green Building Council’s Leadership in Energy and Environmental Design (LEED) certification program and to achieve LEED Gold status. The LEED rating system measures a proposal’s impact on the environment through various categories such as climate change (carbon emissions), indoor air quality, resource depletion, human health, water efficiency and habitat alteration, among others.

To achieve credit for water efficiency, SPU wanted to harvest rainwater to reuse onsite. The harvested water will be used for irrigation, to wash the transfer station floor, washdown water for the tipping floor, and the wheel wash which trucks can utilize as they leave the tipping floor. With limited available space on the site, they needed to utilize an underground system.

SPU worked with URS Corp Inc. to find a rainwater harvesting cistern to meet their needs and chose a DuroMaxx steel reinforced polyethylene (SRPE) cistern from Contech Engineered Solutions. The system is comprised of two 84” diameter cistern sections that are each 75 feet long. The DuroMaxx SRPE cistern was chosen because it was available in such a large diameter and provided water tight joints. It was also an economical solution.

The cistern features include a 12” rain leader for runoff collection, valve control outlets to drain the tanks for maintenance, four 36” access risers with integral ladders, and internal pumps connected to the irrigation system. The irrigation will be used for the new landscaping around the facility, including 123 on-site trees, 32,000 square feet of ground cover, and 81,000 square feet of grass cover. The system was installed below grade by KLB Construction and was backfilled in just three days.

“The installation went smoothly and we preferred to utilize the DuroMaxx product over the alternatives,” said Aiesh Ragih with KLB Construction.


Taylor Yard Transit Village - Los Angeles, California

Owner: McCormackBaronSalazar,Inc.

Engineer: HallandForeman,Inc.

Contractor: Adolfson&Peterson

Construction/APWestCoast,Inc.


• DuroMaxx®SRPECistern

• CMPretentionsystem

• PeakDiversionStormwaterManagementStormFilter®

Situated along the Los Angeles River, and slightly over 3 miles from downtown LA, Taylor Yard’s Parcel C, a 24-acre site, was once lush farmland in Rancho San Rafael, and later a major hub for the Southern Pacific Railroad.

This highly-prized site is being transformed into a transit oriented mixed-use development with 30,000 SF of retail space and 401 new housing units. The development is designed as an intricate network of pedestrian-friendly streets and blocks around a central linear green “Alameda” that connects a new retail street to the 40 acre public park west of the site. The project’s proximity to the Los Angeles River and current revitalization present a great opportunity for new ways of thinking about similar sites in the region.

The project civil engineers, Hall and Foreman, needed to meet local stormwater retention sizing requirements while maximizing the available land space. The City of Los Angeles promotes LID design. The engineer for this project first looked at infiltration but when it became evident that infiltration was not a viable option, they turned to rainwater harvesting to retain the water on site for these areas with the added long term benefit of reducing the potable water demand for the site’s irrigation system.

As the retention design progressed, a unique hybrid rainwater harvesting/detention system with pretreatment and overflow treatment was designed. This solution met all of the project requirements and budget.

An UrbanGreen® rainwater harvesting system was installed on Lot 7 consisting of two barrels, each made from 145’ long 120” dia. DuroMaxx® steel reinforced polyethylene (SRPE). DuroMaxx was chosen for its large diameters, cost, and watertight joints. The cistern was designed to hold 164,960 gallons of harvested rainwater. Contech also provided the mechanical pumps and controls needed to run the system and deliver the captured water.

In addition, Contech provided two CMP detention systems using 773 LF of 120” dia. CMP and 192 LF of 114” dia. CMP, all coated with aluminum to fulfill the surface area and active storage area requirements.

These systems were designed with CDS® units for pretreatment of the water before it enters the cistern and overflows to the detention systems. The CDS system uses a unique combination of continuous deflective screening, swirl concentration and gravity to remove sediment, trash, and oil and grease from stormwater runoff.


Taylor Yard Transit Village, cont.

“Rainwater harvesting retained stormwater onsite

with the added benefit of reducing the potable water

demand for the site’s irrigation

system.”

If the cistern and detention system are full, water will overflow to the peak diversion StormFilter where it will receive polishing treatment before discharging to the storm drain system.

The rainwater harvesting system for Lot 7 was designed to irrigate roughly 20,300 SF of landscaping and save over 122,800 gallons of potable water per year. The Lot 8 system was designed to irrigate 20,800 SF of landscaping and save over 125,850 gallons of potable water per year.

The Taylor Yard Transit Village is a LEED-Neighborhood Development pilot program which integrates the principles of smart growth, urbanism, and green building into the first national system for neighborhood design. The program emphasizes elements that bring buildings and infrastructure together and relates the neighborhood to its local and regional landscape. The Contech UrbanGreen rainwater harvesting and stormwater management systems play an essential role in this initiative at the Taylor Yard site.

“The Taylor Yard Transit Village project presented unique stormwater retention and treatment challenges, for which the Contech UrbanGreen rainwater harvesting system provided the best solution,” said Deering Volkmann Viola, P.E., Associate Project Manager at Hall and Foreman. “This system not only works with the project’s close proximity to the LA River and the complexities with regards to its history as a rail yard, but also utilizes available underground space, so the project aesthetics were not impacted. Employing this system provided irrigation demand savings and was installed within the anticipated budget. The Contech team was consistently available for design consultations and were present throughout the installation process. We will definitely recommend this product on future projects.”


Alta Vista Park - Redondo Beach, California

Owner: CityofRedondoBeach

Engineer: CityofRedondoBeach

Contractor: MehtaMechanical

Company(MMCInc.)



• (2)StormwaterManagementStormFilter®

The number one cause of coastal water pollution in Southern California is urban stormwater runoff. The City of Redondo Beach is taking steps to protect their coastal waters south of the Redondo Beach Municipal Pier in Santa Monica Bay by collecting the stormwater runoff that would have been harmful to the beach, treating the runoff and then using it to irrigate Alta Vista Park. Water that is not needed for irrigation will be infiltrated into the ground, reducing discharge to the ocean.

According to a statement by the EPA’s Pacific Southwest Region, with this innovative project, the City of Redondo Beach is taking a positive step to protect beach users and at the same time conserve Southern California’s scarce water supply.

The Alta Vista Park Diversion and Reuse Project is a $2.2 million venture designed to help the city comply with Regional Water Quality Control Board requirements to reduce stormwater pollution. This system will store runoff from dry weather and first flush flows as well as larger rain events.

The project funded by the American Recovery and Reinvestment Act (ARRA) and administered through the State Water Resources Control Board’s Clean Water State Revolving Fund (CWSRF). Under the Recovery Act, California received $280 million from the U.S. Environmental Protection Agency (EPA) for water quality protection projects and at least 20% of these funds must be provided to “Green Projects” that support sustainable practices, such as the Alta Vista Park project.

“The City Council has been very proactive regarding water quality and “Green” development. Their support has given the staff the incentive to think outside the box and to come up with innovative projects that protect the bay and our valuable resources,” said Mike Shay, Principal Civil Engineer, City of Redondo Beach.

Capturing and reusing stormwater – also known as rainwater harvesting – helps maintain a site’s predevelopment hydrology. The City of Redondo Beach needed a rainwater harvesting system installed below ground to accommodate the small site constraints of Alta Vista Park. Several alternatives were considered for the underground storage component, including modular tank systems and slip joint piping systems. Ultimately, a four phase rainwater harvesting system from Contech was utilized for Alta Vista Park. This includes two treatment systems and storage cisterns.


Alta Vista Park - Redondo Beach, California

“Capturing and reusing stormwater

– also known as rainwater harvesting

– helps maintain a site’s predevelopment

hydrology.”

Mehta Mechanical Company (MMC Inc.) installed a CDS® system as phase one of the project to collect and pretreat the stormwater runoff. The CDS system uses patented continuous deflective separation technology to screen, separate and trap the debris, sediment and oil from the stormwater runoff. The indirect screening capability of the system allows for 100% removal of floatables and neutrally buoyant material, without blinding and allowing consistency for maintenance within the City.

Stormwater runoff then flows to an UrbanGreen® rainwater harvesting system consisting of two DuroMaxx® steel reinforced polyethylene (SRPE) 60-in. diameter cisterns designed to contain the water for re-use in irrigation. The system consists of a north buffer (surge) tank and a south cistern storage tank. The north buffer tank is a 29-ft. wide by 40-ft. long, double header system responsible for 20,714 gallons of storage and will regulate the stormwater flow through the main pipelines by acting as a buffer during peak loads.

DuroMaxx was chosen because of its superior joint quality. DuroMaxx uses welded couplers that are manufactured using high density polyethylene pressure rated resins and flat steel band couplers. The frequency of rain events can be very sporadic in Southern California, and the reduction of water loss makes the joint integrity of the welded coupler joints very important.

Water flow is refined in the third phase with a Stormwater Management StormFilter® before it is utilized for watering the landscape. Two 8-in. x 16-in. Stormwater Management StormFilter precast vault systems – each consisting of 33 cartridges – were installed upstream of the South Cistern Storage Tank and utilize a filtration media to remove the remaining pollutants.

The City used two StormFilter systems instead of one as a precautionary measure in case maintenance on one system is needed. The StormFilter was chosen because its patented, surface-cleaning system prevents surface blinding, extending the cartridge life cycle, thus reducing maintenance.

The South Cistern is a 97-ft. wide x 95-ft. long single header system responsible for 123,339 gallons of storage and will act as the main storage before irrigation re-use. The irrigation water supply system included two vertical turbine pumps and a hydro pneumatic tank to maintain the water pressure and flow rates equivalent to current irrigation demands. If the South Cistern is dry, the structure will isolate itself and water will be provided by the municipal water system. A reduced pressure double check backflow preventer has also been installed to prevent cross-contamination.

The project was completed in 2010 and is being monitored through an SCADA (Supervisory-Control and Data Acquisition) system allowing for remote real time observation.


Chick-fil-A - Fort Worth, Texas

“Engineers went a step further by harvesting rainwater to reuse onsite for

irrigation. With limited available space on this redeveloped urban site, they needed

to utilize an underground system.”

Owner: Chick-fil-A

Engineer: BurgerEngineering,LLC

Contractor: LandmarkGeneral

ConstructorsKCKUtilityConstruction,Inc.

UrbanGreen® RWH System: • (3)DuroMaxx®SRPEcisterns

A Chick-fil-A restaurant at Montgomery Plaza in Ft. Worth, Texas was the company’s first effort to design and build a sustainable restaurant—a building that is environmentally friendly and saves operating costs through energy efficiency. It was the first in the chain to be built to the standards of the U.S. Green Building Council’s Leadership in Energy and Environmental Design (LEED) certification program.

“Our Montgomery Plaza location was the city’s first restaurant to earn LEED Gold certification, and only the second in Texas,” said Chick-fil-A Vice President David Farmer. “An environmentally designed store has long been in the company’s plans, but the chance to build one hadn’t arisen until now. Montgomery Plaza is a redeveloped urban site, earning points toward LEED certification.”

Designers focused on energy and water conservation, recycling, and packaging when planning the restaurant. In order to reduce energy use by about 14%, skylights were installed in the 132-seat dining area and windows were used in the kitchen to let in natural light. All appliances are energy efficient, and the ventilation system will pump in about 30% more fresh air than a typical vent hood.

For water efficiency, low-flow fixtures were installed in the kitchen and restrooms. Engineers went a step further by harvesting rainwater to reuse onsite for irrigation. With limited available space on this redeveloped urban site, they utilized an underground system.

Chick-fil-A officials cooperated with Burger Engineering, LLC to find a cistern to meet their needs and chose a 35,000-gallon DuroMaxx steel reinforced polyethylene (SRPE) cistern from Contech Engineered Solutions. Comprised of three 60-in. cistern sections that are each 80 LF, the system was installed below grade and was backfilled in just one day.

“We chose the DuroMaxx cistern because of its superior joint quality; it will hold water for extended periods of time,” said Bryan Burger with Burger Engineering, LLC. “It was also preferred because of its cost effectiveness when compared to concrete pipe. Concrete is more expensive and is not watertight.”

The SRPE cisterns use welded coupler joints, which are manufactured using high-density polyethylene pressure-rated resins and flat steel-band couplers. By implementing these water-efficiency features, the restaurant will reduce water usage by approximately 40%.

The Montgomery Plaza Chick-fil-A serves as a testing ground to evaluate the company’s ongoing environmental stewardship efforts. In December 2011, the restaurant was LEED Gold certified and was the first restaurant in Fort Worth to receive this designation.


Westfield Century City Parking Structure - Century City, California

“Water stored in the cisterns is metered out slowly within a 24-

hour period to planters along the facade of the parking garage.”

Owner: WestfieldMalls

Engineer: RickEngineering

Contractor: CaspianPlumbing

UrbanGreen® RWH System: • (2)DuroMaxx®SRPEcisterns

• Mechanicalpumpsandcontrols

Westfield Century City, a shopping mall in the Century City neighborhood of Los Angeles, California, completed the construction of a new $30 million parking structure, adding 500 new parking spaces to the mall.

Adding a parking garage to an existing mall in an urban environment was daunting. There was little usable area to place a stormwater solution, so an infiltration system was not a viable solution. The engineers on the project, Rick Engineering, then looked at a solution using flow-through planters, as the City of LA’s Low Impact Development regulations require flow-through planters be used if infiltration is not possible.

Rick Engineering designed a system that would optimize the size of the planters by including two DuroMaxx Steel Reinforced Polyethylene (SRPE) cisterns in the basement of the parking garage. The cisterns were sized to hold the City of LA’s Standard Urban Stormwater Mitigation Plan (SUSMP) sizing of the ¾ inch storm event. Each of the watertight cisterns consists of 32 LF of 72” diameter DuroMaxx. DuroMaxx is an ideal choice for rainwater harvesting cisterns. Eighty (80) ksi steel reinforcing ribs provide the strength, and pressure rated polyethylene (PE) resin provides the durability. The combination of materials results in an extraordinarily strong and durable pipe that sets a new industry standard. All DuroMaxx cisterns are custom made to watertight specifications to suit project requirements.

Contech provided an integrated solution, including all of the pumps and controls for the system, along with engineering and design support. Water stored in the cisterns is metered out slowly within a 24-hour period to planters along the facade of the parking garage. This design met the stormwater regulations, while optimizing critical parking spaces within this parking garage.

“This was a complex and highly constrained urban redevelopment project that involved participation by a number of consultants to ensure compliance with the City of Los Angeles sanitation and building department requirements,” said Frank Lopez, Project Manager at

Rick Engineering. “The Contech team helped bridge the gap between consultants who were focused on meeting specific requirements associated with their respective design. The team was highly responsive and technically sound. Many thanks to Jeremiah Lehman, Kathryn Thomason and Maryjane Macleod for their assistance.”

Contech’s UrbanGreen Rainwater Harvesting System resulted in economic, regulatory and aesthetic goals being met.


City of Springfield Sewer Garage - Springfield, Illinois

“Engineers went a step further by harvesting rainwater to reuse onsite for irrigation. With limited available space on this redeveloped urban site, they

needed to utilize an underground system.”

Owner: CityofSpringfield

Engineer: HansonProfessionalServices

Contractor: PetersburgPlumbing,Inc.

UrbanGreen® RWH System: • DuroMaxx®SRPEcistern

• CDS®hydrodynamicseparator

The city of Springfield, Illinois public works garage is using green infrastructure to capture rainwater runoff, filter pollutants, and put the water to use for other purposes.

The project included the installation of a bioswale and a rainwater harvesting system that will collect runoff, treat it, and reuse it for watering downtown plants and in the city’s jetting trucks for cleaning sewer lines. The bulk of the project is being covered by a $600,000 Illinois Green Infrastructure Grant the city received in 2014.

The rainwater harvesting cistern consists of 4 barrels of 96” diameter DuroMaxx steel reinforced polyethylene to store 94,000 gallons of stormwater runoff. DuroMaxx was the perfect material for this application as it can be constructed with watertight joints and can withstand the high depth of earth cover due to the depth of the storm sewer being routed to the storage cistern.

A CDS hydrodynamic separator was also installed to pretreat the runoff before entering the system. Pretreating harvested rainwater is essential to ensure the long-term operation of any rainwater harvesting system. Pretreating harvested water prior to storage protects downstream pumps, filters, and fixtures from damage or clogging, and it lowers cleaning and maintenance costs by keeping pollutants out of the cistern and mechanical system. It also reduces the amount of organic matter and biological oxygen demand in the cistern, decreasing the likelihood of creating anaerobic conditions and associated odors.


Additional Rainwater Harvesting Resources

Learn About Rainwater Harvesting New stormwater regulations require on-site water management, which can be a design challenge. Rainwater Harvesting is a Low Impact Development tool that can achieve both runoff reduction and water conservation.

Go online (www.ContechES.com/rwh-animation) and watch our video to learn how Rainwater Harvesting offers benefits including:

• Achievetherunoffreductionrequiredforyour

stormwaterpermit

• Conservewaterresources

• Provideupto12LEEDPoints

• An LID solutionwithapositive ROI through

utilitysavings

To use the Rainwater Harvesting Runoff Reduction Calculator tool, visit:

www.ContechES.com/rwh-calculator

To view the Rainwater Harvesting Animation, visit:

www.ContechES.com/rwh-animation

Calculate the Benefits of Rainwater

HarvestingThe Contech Runoff Reduction Calculator (www.ContechES.com/rwh-calculator) is a free tool that allows users to quickly and easily determine the benefits of a rainwater harvesting system. With the Runoff Reduction Calculator, you can calculate:

• Runoff Reduction and Stormwater Volume

RetainedOn-site

• Water saving and reduction of demand on

potablesupplies

• Financialsavingsbasedonreducedutilityfees

• InformationtosupportLEEDCredits

• ReportsforStormwaterPermitApproval

Next Steps

Dig DeeperFind all the information you need at www.ContechES.com, including field and laboratory test results, approvals, brochures, design guides, standard details and specifications within the product section of our site.

Connect with UsWe're here to make your job easier – and that includes being able to get in touch with us when you need to. www.ContechES.com/localresources. While you’re there, be sure to check out our upcoming seminar schedule or request an in-house technical presentation.

Start a ProjectIf you are ready to begin a project, contact your local representative to get started. Or you can check out our design toolbox for all our online resources at www.ContechES.com/startaproject.

RWHCaseBookPDF2/16

NOTHING IN THIS CATALOG SHOULD BE CONSTRUED AS AN EXPRESSED WARRANTY OR AN IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. SEE THE CONTECH STANDARD CONDITION OF SALES (VIEWABLE AT WWW.CONTECHES.COM/COS) FOR MORE INFORMATION.


Links to Stormwater Design Tools:To use the Land Value Calculator, visit: www.ContechES.com/l v cTo use the Design Your Own Detention System tool, visit: www.ContechES.com/dyodsTo use the Design Your Own Hydrodynamic Separator tool, visit: www.ContechES.com/dyohdsTo use the Rainwater Harvesting Runoff Reduction Calculator tool, visit: www.ContechES.com/rwh -ca l cu lat or To use the Low Impact Development Site Planner tool, visit: www.ContechES.com/l i d s i t e p l a n n er

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