LO S A N G E L E S C O U N T YDEPARTMENT OF PUBLIC WORKS

LOS ANGELES COUNTY Los Angeles County covers over 4,000 square miles

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27 percent of California’s residents live in LosAngeles County .

LOS ANGELES COUNTY FLOOD CONTROL DISTRICT Operates and maintains a system of flood control

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Boundaries encompass an area of 2,752 squaremiles

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STORMWATER CAPTURE LA River – 10% stormwater capture

San Gabriel River within the San Gabriel Valley–90% stormwater capture

REGIONAL WATER SUPPLY AND DEMAND

LA Basin 56% Import 44% Local 1,515,000 AFY Demand

LA City 88% Import 12% Local (includes 1% Recycled) 621,700 AFY Demand

LA BASIN REGIONAL WATER SUPPLY AND DEMAND

COUNTY OF LOS ANGELESDepartment of Public Works

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www.dpw.lacounty.gov @LACoWater @LAPublicWorks

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Survey/Mapping & Property Management Division, Mapping & GIS Services Section

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MAINTENANCE RESPONSIBILITIESLEGEND

LOS ANGELES COUNTYDEPT. OF PUBLIC WORKS

UNITED STATES ARMYCORPS OF ENGINEERS

CHANNELS

RESERVOIR

SPREADING GROUND

RESERVOIRDAMS / RESERVOIRS0 2 4 6

Miles

I

COUN

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BALLONA CREEK PACIFIC OCEAN (STA.0+00) TO 100' NO. OF VISTA DEL MAR (STA.23+46.99) BENEDICT CANYON CHANNEL (STA.304+00) TO WASHINGTON BLVD. (STA.391+02.48)________________________________________________________________________________

LOS ANGELES RIVER PACIFIC OCEAN (STA.0+00) TO 600' SO. OF OCEAN BLVD. (STA.16+00) 200' SO. OF SOUTHERN AVE. (STA.685+00) TO 1500' E. OF LANKERSHIM BLVD. (STA.592+00) SEPULVEDA FLOOD CONTROL BASIN 400' W. OF SEPULVEDA BLVD. (STA.969+89.01) 200' W. OF LOUISE AVE. (STA.1131+69.50)BURBANK WESTERN LOS ANGELES RIVER TO VICTORY BLVD.SYSTEM STA.47+36.57)COMPTON CREEK ALAMEDA BLVD. (STA.199+31.00) TO 1500' NO. OF EL SEGUNDO BLVD. (STA.411+66)HAINES CANYON 100' E. OF PLAINVIEW AVE. (STA.123+30.00) TO HAINES CANYON DEBRIS BASIN (STA.216+62.00)VERDUGO WASH LOS ANGELES RIVER TO 150' E. OF SAN FERNANDO RD.SYCAMORE CHANNEL LOS ANGELES RIVER TO 530' SO. OF SAN FERNANDO RD.RIO HONDO WHITTIER NARROWS FLOOD CONTROL BASIN 500' SO. OF WHITTIER NARROWS DAM (STA.437+23.71) TO 600' NO. OF GARVEY AVE. (STA.638+00.00)ALHAMBRA WASH VALLEY BLVD. (STA.171+30.00) TO ROSES RD. (STA.295+63.43)SAN PASQUAL ALHAMBRA WASH (STA.1+34.91) TOWASH 250' NO. OF PINE ST. (STA.93+12.60)________________________________________________________________________________SAN GABRIEL RIVER WHITTIER NARROWS FLOOD CONTROL BASIN 1250' E. OF PECK RD. (STA.1173+50.00) TO THIENES AVE. (STA.1224+30.00) 600' SO. OF FOOTHILL BLVD. (STA.8+40.00) TO MOUTH OF CANYON (STA.176+15.00)SAN JOSE CREEK SAN GABRIEL RIVER (STA.31+26.83) TO STA.79+25.00)

UNITED STATES ARMY CORPS OF ENGINEERSMAINTAINED CHANNEL REACHES

(DISTANCES NOTED ARE APPROXIMATE VALUES)

LOS ANGELES COUNTYFLOOD CONTROL DISTRICT

COUN

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Regional Water Reliability – Spreading Grounds

Hansen Spreading Grounds - Empty (Aerial images courtesy of Google earth)

Hansen Spreading Grounds- Full (Aerial images courtesy of Google earth)

SUN VALLEY WATERSHED

RORY M. SHAW WETLANDS PARK

The Sun Valley—Rory M. Shaw Wetlands Park Project is identified as a major component of the Sun

Valley Watershed Management Plan, a plan developed by the Los Angeles County Flood Control District

to solve the major flooding problem, while retaining all stormwater runoff from the watershed, increasing

water conservation, recreational opportunities, and wildlife habitat, and reducing stormwater pollution.

EXISTING LANDFILL SITE

PROPOSED WETLANDS PARK

Project Description

The Sun Valley Watershed—Rory M. Shaw Wetlands Park

Project is a collaborative effort amongst the Los Angeles

Flood Control District, the City of Los Angeles, and the Sun

Valley Watershed Stakeholders Group to address flooding

downstream of the Strathern Pit site, at the intersection of

Tujunga Avenue and Strathern Street.

The project proposes to convert a 46-acre, engineered, inert

landfill into a multi-purpose wetlands park. A storm drain

system will be constructed to collect stormwater runoff from

the upstream 929-acre drainage area and convey them into

the project site. Detention ponds and wetlands will be

constructed to capture and treat stormwater runoff to provide

water quality enhancement. The treated flows will then be

pumped to the adjacent Sun Valley Park for infiltration into

existing infiltration basins, providing recharge into the

groundwater. The water conservation benefit is expected to

be 590 acre-feet per year. In addition to water quality

improvements, the constructed wetlands will also enhance

native vegetation and create opportunities for wildlife

habitat. The project will provide an additional 46 acres of

open space recreation to a community that is currently

underserved for recreational opportunities. Proposed

recreational enhancements include trails, active recreational

amenities, educational signage and restrooms.

The total cost for design and construction is estimated at $52

million and will be funded by the Los Angeles County Flood

Control District, the Los Angeles Department of Water and

Power, and Proposition O grant funds. The Project is

currently in the design phase .

SUN VALLEY WATERSHED

SUN VALLEY PARK DRAIN AND

INFILTRATION SYSTEM PROJECT

The Sun Valley Watershed—Sun Valley Park Drain and Infiltration System Project is identified as a major

component of the Sun Valley Watershed Management Plan, a plan developed by the Los Angeles County

Flood Control District to solve the major flooding problem, while retaining all stormwater runoff from the

watershed, increasing water conservation, recreational opportunities, and wildlife habitat, and reducing

stormwater pollution.

Project Description

The Sun Valley Watershed – Sun Valley Park Drain and Infiltration System Project converted an existing

municipal park into a flood mitigation, water quality treatment, and water conservation multi-use site.

Localized flooding is alleviated in the area as stormwater runoff from the 21-acre drainage area is collected

through a constructed storm drain system to the Sun Valley Park. Runoff is routed through a water quality

treatment system at the park to remove suspended solids and heavy metals. The treated runoff is then

directed into two underground infiltration basins where the water is naturally filtered and recharged into

the groundwater aquifer. The water conservation benefit is estimated to be 30 acre-feet per year. The

infiltration basins are buried beneath the soccer and baseball fields to maintain the park’s functionality.

Vegetated swales with California native plants were also strategically placed throughout the park to treat

runoff from the surrounding areas. In addition, the project also included enhancements to the park’s

recreational amenities, such as new soccer and baseball fields, bleachers, sports lighting, and interpretive

signage.

Construction of the project was completed in 2006 with total project cost of approximately $7 million.

The project was funded by the Department of Water Resources (Local Groundwater Assistance) grant, a

Proposition 12 (Murray-Hayden) grant received by TreePeople, and the Los Angeles County Flood

Control District.

Designed By: CH2MHill

Constructed by: Southwest Engineering, Inc.

Operated and Maintained By: Los Angeles County Flood Control District, City of Los Angeles Bureau of

Sanitation, and City of Los Angeles Department of Recreation and Parks

DOMINGUEZ GAP WETLANDSMULTI-USE PROJECT

The Dominguez Gap Wetlands Multi-Use Project is located on the east bank of the Los Angeles River justsouth of Del Amo Blvd in the City of Long Beach. The project was identified in the Los Angeles RiverMaster Plan, adopted in 1996, as one of the top five demonstration projects that would provide floodmanagement, water quality and environmental enhancements, and recreation and educationalimprovements.

Project Description

The Dominguez Gap Wetlands Multi-Use Project converted an existing, 37-acre, spreading ground basininto a multi-benefit wetlands. Flows from the Los Angeles River and local urban runoff are routedthrough the basin to sustain a year-round aquatic habitat for riparian plant species and native wildlife. Thewetland also removes pollutants such as heavy metals, organic carbons, oil, grease, and nutrients from therunoff. The treated runoff is then directed into the Dominguez Gap Spreading Grounds West Basin forstorage and groundwater recharge. During high flows from the surrounding tributary areas, flows from thewetlands are pumped into the Los Angeles River. In addition, the wetlands provide increasedopportunities for open space and passive recreational amenities, such as an equestrian trail, bike path andwalkways that are accessible to the public and interpretive signage.

Construction of the project began in 2006 and was completed in 2008 with a total project cost ofapproximately $7.1 million. The project was funded by Proposition 13 CALFED grant, Proposition 40funds administrated through the Rivers and Mountains Conservancy, the California Coastal ConservancyWetland Recovery Project, and the Los Angeles County Flood Control District.

Designed By: CH2MHillConstructed by: Environmental Construction, Inc.Operated and Maintained By: Los Angeles County Flood Control District, City of Long Beach Departmentof Parks, Recreation, and Marine

Pre-Construction Photo: Spreading Ground Basin Post-Construction Photo: Wetlands

The Tujunga Wash Ecosystem Restoration Phase I Project was a collaborative effort between the Los

Angeles County Flood Control District, the Santa Monica Mountains Conservancy and the Mountains

Recreation and Conservancy Authority to restore both sides of the Tujunga Wash channel between Vanowen

Street and Oxnard Street and provide open space and passive recreational opportunities.

Project Description

The Tujunga Wash Ecosystem Restoration Phase I Project restored a one-mile reach along the Tujunga Wash

and provides open space within the Valley Glen community. The project restored riparian habitat, allows for

groundwater recharge, enhances water quality, and serves as a model for the creation of a sustainable and

healthy alternative stream system in a dense urban setting. In addition, both banks of the channel include

pedestrian walkways, seating areas, native and drought-tolerant landscaping and new entryways.

Construction of the project was completed in 2007 with total project cost of approximately $7 million. The

project was funded by County Supervisor Zev Yarovslavsky (3rd District) through Proposition A, the

Department of Water Resources, the Resources Agency, and Los Angeles County Flood Control District. The

project was managed by the Santa Monica Mountains Conservancy and Mountains Recreation and

Conservation Authority.

Designed By: Los Angeles County Flood Control District, Mountains Recreation and Conservation Authority

Operated and Maintained By: Mountains Recreation and Conservation Authority

TUJUNGA WASH

ECOSYSTEM RESTORATION PHASE I

Before construction After construction —Completed 2007

Tujunga Wash is a nine-mile concrete rectangular channel that conveys runoff from Hansen Dam to the

Los Angeles River. The Tujunga Wash Ecosystem Restoration Project is a collaborative effort between the

Los Angeles County Flood Control District and the U.S. Army Corps of Engineers to restore both sides of the

Tujunga Wash channel between Vanowen Street and Sherman Way.

This project creates a new naturalized stream that meanders along the west bank of the channel. Both banks

includes pedestrian walkways, seating areas, native and drought-tolerant landscaping, and new entryways.

This project greatly enhances the environment by providing more than 10 acres of open space in an area that

significantly lacks this resource. The project also restores riparian habitat and serves as a model for a

sustainable and healthy stream system in a dense, urban setting.

The Corps of Engineers, under Section 1135 of the Water Resources Development Act, performed a

reconnaissance study and determined the project was eligible for Federal participation and funding. Under this

program, the Corps of Engineers funded 75 percent and the Flood Control District funded 25 percent of the

total project costs. Construction of the project was completed in July 2012 with a total project cost of

approximately $7 million.

This project is an extension of the Tujunga Wash Greenway and Stream Restoration Phase I between

Vanowen Street and Oxnard Street which was completed in 2007. In total, both projects provide over 1.75

miles of enhanced Flood Control right-of-way.

TUJUNGA WASH

ECOSYSTEM RESTORATION PHASE II

before construction After construction —Completed 2012

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LOS ANGELES BASIN

STORMWATER CONSERVATION STUDY

The Los Angeles Basin Stormwater Conservation Study (LA Basin Study) is assessing the region’s major water conservation and flood control infrastructure to prepare for future changes in climate and population. The LA Basin Study is a long-range planning effort that is evaluating the potential of the existing Los Angeles County Flood Control District (LACFCD) facilities and other new stormwater capture concepts to increase the local water supply under an uncertain future. Detailed scientific, engineering, and economic analyses are being conducted to help address future water supply demands and challenges as a result of climate change and population growth. The study is a collaboration between the LACFCD and the Bureau of Reclamation to ensure continued reliability and further enhancement of stormwater as a locally sustainable supply source. This effort is estimated to cost $2.4 and take three years to complete.

The LA Basin Study has completed the analysis of the following:

1. Future climate change projections and hydrologic modeling

2. Water supply and water demand projections 3. Existing infrastructure response to future

conditions

The study is now focusing its efforts on developing stormwater capture concepts that can help the region become more resilient to climate change by taking steps to further secure stormwater as a local water supply. These concepts will undergo an economic cost-benefit analysis before the final recommendations are made in December 2015.

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Study Partners »

Los Angeles County Flood Control District (LACFCD) U.S. Department of the Interior - Bureau of Reclamation (Reclamation) U.S. Army Corps of Engineers Over 35 members on the Stakeholder Technical Advisory Committee such as LADWP, MWD,

TreePeople, Council for Watershed Health, USGVMWD, etc.

Objectives »

Evaluate existing water conservation under future conditions

Evaluate potential new facilities & operational changes for climate change

Study Tasks »