Los Angeles Basin Stormwater Conservation Study Los Angeles County - - PowerPoint PPT Presentation

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Los Angeles Basin Stormwater Conservation Study Los Angeles County - - PowerPoint PPT Presentation

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Los Angeles Basin Stormwater Conservation Study Los Angeles County Flood Control District U.S. Department of the Interior Bureau Of Reclamation TASK 4 KICKOFF MEETING JANUARY 28, 2014 Meeting Objectives Overview of Study Progress

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Los Angeles County Flood Control District U.S. Department of the Interior – Bureau Of Reclamation TASK 4 – KICKOFF MEETING JANUARY 28, 2014

Los Angeles Basin Stormwater Conservation Study

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Reclamation, LACFCD, LACDPW – Los Angeles Basin Stormwater Conservation Study

Meeting Objectives

  • Overview of Study
  • Progress Update / Schedule
  • Task 4 Overview
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Study Overview

Partnership between:

  • Los Angeles County Flood Control District
  • U.S. Department of the Interior – Bureau of Reclamation

Basin Study Cost Estimate: $2.4 million

  • Reclamation funding: $1 million
  • LACFCD funding: $1,364,666
  • Local Partners match: $59,960

Official Start Date – December 27, 2012 3 Years to Complete Study

Reclamation, LACFCD, LACDPW – Los Angeles Basin Stormwater Conservation Study

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Study Area

Reclamation, LACFCD, LACDPW – Los Angeles Basin Stormwater Conservation Study

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Study Objectives

LA Basin Study Objectives

  • Evaluate existing water conservation under future conditions
  • Evaluate potential new facilities and operational changes for a future climate

Methodology

  • Detailed scientific, engineering & economic analyses
  • Coordinating with existing & proposed planning efforts
  • Developing partnerships
  • Local stakeholder involvement

Reclamation, LACFCD, LACDPW – Los Angeles Basin Stormwater Conservation Study

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Key Considerations

  • Account for projected climate change
  • Population growth

Reclamation, LACFCD, LACDPW – Los Angeles Basin Stormwater Conservation Study

2 4 6 8 10 12 14 1900 1925 1950 1975 2000 2025 2050 2075 2100 Population (Millions) Year

Los Angeles County Population Projection

California Department of Finance, - State and County Population Projections USGS - CMIP5 Global Climate Change Viewer

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SLIDE 7

Other Basin Studies

  • Colorado River Basin Water Supply & Demand Study
  • Completed December 2012
  • http://www.usbr.gov/lc/region/programs/crbstudy.html
  • Santa Ana Watershed Basin Study
  • Completed September 2013
  • http://www.usbr.gov/WaterSMART/bsp/completed.html

Reclamation, LACFCD, LACDPW – Los Angeles Basin Stormwater Conservation Study

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Progress Update

Reclamation, LACFCD, LACDPW – Los Angeles Basin Stormwater Conservation Study

  • Task 3 – Downscaled Climate

Change & Hydrologic Modeling

  • Report Published

December 2013

  • Projections show wide

variability in Los Angeles County stormwater runoff

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Study Schedule

  • Water Supply & Demand Literature Review
  • Supply Analysis
  • LACFCD Water Conservation System Contributions
  • Report Review & Publishing
  • General oversight and project guidance
  • Study Task Facilitation/Coordination
  • Study Outreach
  • Response to Current Climate
  • Response to Future Climate
  • Report Review & Publishing

TASK 2 – Water Supply & Demand Projections

  • Downscaled Climate Change Modeling
  • Hydrologic Modeling – Current/Projected
  • Report Review & Publishing (Complete)

TASK 3 – Downscaled Climate Change & Hydrologic Modeling TASK 4 – Existing Infrastructure Response & Operations Plans Analysis September 2013 To July 2014 January 2013 To December 2015 February 2014 To August 2014 February 2013 To December 2013 TASK 1 – Study Project Management

ACTION SCOPE TARGET

Reclamation, LACFCD, LACDPW – Los Angeles Basin Stormwater Conservation Study

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Study Schedule

TASK 5 – Infrastructure & Operations Concepts

  • Develop Concepts
  • Evaluate and Refine Concepts
  • Appraisal-Level Planning
  • Report Review & Publishing

TASK 6 – Trade-Off Analysis & Recommendations

  • Conduct Economic Analysis
  • Conduct Non-Economic Analysis
  • Develop Trade-off Matrix
  • Cost Effectiveness
  • Develop Recommendations
  • Report Review & Publishing

TASK 7 – Final Report

  • Prepare Final Report
  • Final Reviews
  • Publish and Distribute Final Report

January 2014 To January 2015 November 2014 To August 2015 August 2015 To December 2015

Reclamation, LACFCD, LACDPW – Los Angeles Basin Stormwater Conservation Study

ACTION SCOPE TARGET

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Task 4 Overview

Analyze Response to Current Climate

  • Investigate LACFCD water conservation and flood control system / facilities
  • Use current operation guidelines & existing capacities
  • Identify existing facilities that can benefit from enhancements

Analyze Response to Future Climate

  • Assess current operation guidelines & existing capacities under a future climate
  • Identify existing facilities that can benefit from enhancements
  • Facilities identified will be investigated further in Task 5

DELIVERABLE: Task 4 Interim Report

Reclamation, LACFCD, LACDPW – Los Angeles Basin Stormwater Conservation Study

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Task 4 - Dam & Reservoirs

Reclamation, LACFCD, LACDPW – Los Angeles Basin Stormwater Conservation Study

# Dam/Reservoir 1 Big Dalton 2 Big Tujunga 3 Cogswell 4 Devil's Gate 5 Eaton Wash 6 Hansen 7 Live Oak 8 Morris 9 Pacoima 10 Puddingstone 11 Puddingstone Diversion 12 San Dimas 13 San Gabriel 14 Santa Anita 15 Santa Fe 16 Sepulveda 17 Thompson Creek 18 Whittier Narrows

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Task 4 - Spreading Grounds

Reclamation, LACFCD, LACDPW – Los Angeles Basin Stormwater Conservation Study

# Spreading Ground 1 Ben Lomond 2 Big Dalton 3 Branford 4 Buena Vista 5 Citrus 6 Dominguez Gap 7 Eaton Basin 8 Eaton Wash 9 Forbes 10 Hansen 11 Irwindale/Manning Pit 12 Little Dalton 13 Live Oak 14 Lopez 15 Pacoima 16 Peck Road 17 Rio Hondo 18 San Dimas 19 San Gabriel 20 San Gabriel Canyon 21 Santa Anita 22 Santa Fe 23 Sawpit 24 Sierra Madre 25 Tujunga 26 Walnut

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Task 4 Methodology

Analyze Response to Current Climate

  • Review and update existing WMMS facility models
  • Dams / Reservoirs and Spreading Grounds
  • Analyze WMMS current climate results for:
  • Annual average volumes of stormwater captured and discharged
  • Yearly variation for annual stormwater volume captured and discharged
  • Capture-to-Bypass ratio for water conservation facilities
  • Frequency of spillway releases and capacity exceedances for dams / reservoirs
  • Rank water conservation and flood control facilities

Reclamation, LACFCD, LACDPW – Los Angeles Basin Stormwater Conservation Study

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Task 4 Methodology

  • Review and Update Existing WMMS Spreading Ground Model

Reclamation, LACFCD, LACDPW – Los Angeles Basin Stormwater Conservation Study

SWS = Subwatershed WMMS F-Table

SWS 5103 (Reservoir/Dam) SWS 5102 (Spreading Ground) SWS 5101 Recharge Node

(Perc. Rate)

Current System

SWS 5102 (Channel Forebay) SWS 5101 S.G. Recharge Node Spillway

(S.G. Intake) (Perc. Rate) (Rtrn. Rate)

SWS 5103 (Reservoir/Dam)

Remodeled System

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Task 4 Methodology

Analyze Response to Future Climate

  • Use WMMS to assess existing facilities for a range of future climate scenarios
  • Analyze future hydrology to assess current operations and existing facilities
  • Rank water conservation and flood control facilities for the future climate scenarios
  • Facilities identified will be investigated further in Task 5

Reclamation, LACFCD, LACDPW – Los Angeles Basin Stormwater Conservation Study

  • 75%
  • 25%

25% 75% 125% 175% 225% 2011 2023 2035 2047 2059 2071 2083 2095 Percent Change

Variability in Average Annual Stormwater Runoff Volume

Areal Watershed Average for WY 2012-2095

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  • 75%
  • 25%

25% 75% 125% 175% 225% 2011 2023 2035 2047 2059 2071 2083 2095 Percent Change

Variability in Average Annual Stormwater Runoff Volume

Areal Watershed Average for WY 2012-2095

Task 4 Climate Scenarios

Reclamation, LACFCD, LACDPW – Los Angeles Basin Stormwater Conservation Study

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  • 75%
  • 25%

25% 75% 125% 175% 225% 2011 2023 2035 2047 2059 2071 2083 2095 Percent Change

Variability in Average Annual Stormwater Runoff Volume

Areal Watershed Average for WY 2012-2095

Task 4 Climate Scenarios

Reclamation, LACFCD, LACDPW – Los Angeles Basin Stormwater Conservation Study

  • 75%
  • 25%

25% 75% 125% 175% 225% 2011 2025 2039 2053 2067 2081 2095 Percent Change Water Year

Average Annual Stormwater Runoff Volume - 47 Projections

Areal Watershed Average for WY 2012-2095

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  • 75%
  • 25%

25% 75% 125% 175% 225% 2011 2023 2035 2047 2059 2071 2083 2095 Percent Change

Variability in Average Annual Stormwater Runoff Volume

Areal Watershed Average for WY 2012-2095

Task 4 Climate Scenarios

Reclamation, LACFCD, LACDPW – Los Angeles Basin Stormwater Conservation Study

  • 75%
  • 25%

25% 75% 125% 175% 225% 2011 2025 2039 2053 2067 2081 2095 Percent Change Water Year

Average Annual Stormwater Runoff Volume - 47 Projections

Areal Watershed Average for WY 2012-2095

  • 75%
  • 25%

25% 75% 125% 175% 225% 2011 2023 2035 2047 2059 2071 2083 2095 Percent Change

Average Annual Stormwater Runoff Volume – 6 Projections

Areal Watershed Average for WY 2012-2095 High1 High2 Middle1 Middle2 Low1 Low2

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Task 4 Q&A

Reclamation, LACFCD, LACDPW – Los Angeles Basin Stormwater Conservation Study

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Reclamation, LACFCD, LACDPW – Los Angeles Basin Stormwater Conservation Study

Next Steps

Perform Task 4

  • Analyze infrastructure response due to current/projected climate
  • Determine where facility efficiencies can be improved

STAC Meeting – May 2014

  • Review Draft Task 4 Report
  • Task 5 Scoping

Public Meeting – July 2014 Next Tasks

  • Task 2 – Water Supply & Demand Projections
  • Task 5 – Develop Infrastructure & Operations Concepts
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Reclamation, LACFCD, LACDPW – Los Angeles Basin Stormwater Conservation Study

Contact Information

Los Angeles Basin Stormwater Conservation Study

http://www.usbr.gov/lc/socal/basinstudies/LABasin.html LACFCD Contact:

Lee Alexanderson, P. E. County of Los Angeles Department of Public Works Los Angeles County Flood Control District Watershed Management Division (626) 458-4370 lalexanderson@dpw.lacounty.gov

Reclamation Contact:

Amy Witherall, Water Resources Planner Department of the Interior Bureau of Reclamation Lower Colorado River Region Southern California Area Office (951) 695-5310 awitherall@usbr.gov