Stormwater Engineering Projects

Picture of Tujunga Spreading Ground

PROJECT SUMMARY

Ariel View of Tujunga Spreading GroundLos Angeles Department of Water and Power (LADWP) and the Los Angeles County Flood Control District (LACFCD) are cooperatively working to enhance the 150-acre Tujunga Spreading Grounds. Enhancements include expanding and combining the spreading basins and installing new intake structures, which will increase the facility's storage and intake capacity and allow more stormwater to be captured and conserved. The project will result in an increase in groundwater recharge of the San Fernando Groundwater Basin, thus increasing local water supply while reducing dependence on expensive imported water. The renovated facility will include community open space features for passive recreation and enhanced aesthetics.

The project is funded by LADWP and has been awarded a $3 Million grant through the Integrated Regional Water Management Plan (IRWMP) under Proposition 84.

RESOURCES

Benefits to Water Resources
  • Increase reliable and sustainable local water supply; after completion, the project will double the facility's recharge capacity and deliver nearly 12,200 acre-feet (4 billion gallons) of recharge to the groundwater basin on an average annual basis. This is enough water to sustain nearly 36,600 single-family homes.
  • Improve water quality by constructing new low flow water quality basins which will treat and infiltrate low flows diverted from the Tujunga Wash Channel.
  • Help replenish the San Fernando Groundwater Basin and decrease the City's dependence on imported water; historically, LADWP has utilized local groundwater to support approximately 11% of the City's total water demand.
Benefits to the Community
  • A newly constructed passive recreation area will be open to the public during normal dry-weather conditions.
  • Recreational area will include educational signage and learning opportunities.
  • Aesthetic enhancements and landscaping will be installed throughout the facility's perimeter.

PROJECT DETAILS

Location
The Project is located at the intersection of Interstate 5 and CA-Highway 170 in Sun Valley, CA; within Los Angeles City Council District 6 - Nury Martinez and County Supervisorial District 3 - Sheila Kuehl.

Funding
  • Total project cost, including design, management, and construction: $27 Million.
  • The project was awarded $3 Million in Proposition 84 funding through the Greater Los Angeles Integrated Regional Water Management Plan program. The remaining cost is funded by LADWP.
Schedule Project Schedule

Environmental
LADWP prepared an Initial Study and Notice of Preparation for the project in 2012. An Environmental Impact Report (EIR) was prepared for the project and adopted in June 2013.

Scope of Work
The project consists of two main components: the Phase I Basin Enhancements and the Phase II Intake Improvements and Landscaping.

Phase I
Phase I of the project consists of the basin enhancements. The 20 existing spreading basins will be combined and deepened to 10 larger spreading basins. The storage capacity of the spreading grounds will increase from 100 acre-feet to 927 acre-feet. Larger overflow structures and pipes will be constructed throughout the spreading grounds to convey the increased flow rates. New low flow treatment basins will be constructed. Sediment transport during construction will be accomplished using a conveyor belt which will reduce construction traffic and emissions.

Phase II
Phase II of the project consists of the intake improvements and the recreational/landscaping components. Two new rubber diversion gates and intake structures will be constructed in Tujunga Wash Channel, increasing the facility's intake capacity from 250 cubic feet per second to 450 cubic feet per second and allowing the spreading grounds to capture flows from Pacoima Diversion Channel in addition to Tujunga Wash Channel. Perimeter landscaping and aesthetic enhancements will be installed throughout the facility. A new passive recreation area will be constructed complete with a walking path, educational signage, and low impact development features.

Project OverviewTujunga Spreading Grounds Project Overview Map

COOPERATIVE EFFORTS

  • Mayor's Executive Directive 5
  • Governor's Drought Executive Order B-29-15
  • LADWP's Stormwater Capture Master Plan (SCMP)

OUTREACH

Outreach Timeline

EventCouncil DistrictDate
Council District 6 Staff Meeting6July, 2011
EIR Public Meeting6September, 2012
Council District 6 Staff Meeting6August, 2014
Council District 7 Staff Meeting7August, 2014
Sun Valley Area Neighborhood Council Meeting2,6,7August, 2014
North Hollywood West Neighborhood Council Meeting2September, 2014
Mission Hills Neighborhood Council Meeting7September, 2014

Continuing Outreach Efforts
  • Construction Notification Mailers to neighboring residents
  • Update meetings with local Neighborhood Councils upon request
  • Comments and suggestions hotline will be posted at project site during construction
  • Ground-breaking ceremony tentatively scheduled for March, 2016
  • For more project information or to be added to the project mailing list, please email SpreadingGrounds@dpw.lacounty.gov

ANNOUNCEMENTS

Construction of the project began in July 2016. A groundbreaking ceremony will be held onsite on August 22, 2016 at 9 AM.

RESOURCES

CONTACTS

For more information on the project or to be added to the project mailing list, please contact SpreadingGrounds@dpw.lacounty.gov or call John Bodenchak at (626) 458-6156

Updated on: 08/17/2016