RCFC&WCD LID TESTING AND DEMONSTRATION PROJECT On Site Tour August 16, 2011 Bob Cullen P.E., Jason Uhley P.E. Riverside County Flood Control & Water Conservation District
The District s LID BMP Testing and Demonstration Facility 1. Project Background 2. Existing Site Overview 3. LID BMP Demonstration Features (no associated testing) 4. LID BMP Demonstration and Testing Features 5. Anticipated Test Data 6. Design Phase Challenges
The District s LID BMP Testing and Demonstration Facility 1. Project Background 2. Existing Site Overview 3. LID BMP Demonstration Features (no associated testing) 4. LID BMP Demonstration and Testing Features 5. Anticipated Test Data 6. Design Phase Challenges
The District s LID BMP Testing and Demonstration Facility WQMP (intended as Example for others) Project Background Partnership between RCFC&WCD and SAWPA 1. Need for regional LID training centers 2. Need for demonstration of constructible, properly designed LID BMPs 3. Need for real-world LID test results
The District s LID BMP Testing and Demonstration Facility 1. Project Background 2. Existing Site Overview 3. LID BMP Demonstration Features (no associated testing) 4. LID BMP Demonstration and Testing Features 5. Anticipated Test Data 6. Design Phase Challenges
Existing Site Layout Project Limits
Future Site Layout Project Limits
The District s LID BMP Testing and Demonstration Facility 1. Project Background 2. Existing Site Overview 3. LID BMP Demonstration Features (no associated testing) 4. LID BMP Demonstration and Testing Features 5. Anticipated Test Data 6. Design Phase Challenges
Drainage Areas and Corresponding BMPs
Pervious Paver Walkways
Pervious Paver Driveways and Parking
Waterline Break! Tragedy or Demonstration of Benefit?
Waterline Break! Tragedy or Demonstration of Benefit?
Enhanced Vegetated Swale
Infiltration Basin
The District s LID BMP Testing and Demonstration Facility 1. Project Background 2. Existing Site Overview 3. LID BMP Demonstration Features (no associated testing) 4. LID BMP Demonstration and Testing Features 5. Anticipated Test Data 6. Design Phase Challenges
The District s LID BMP Testing and Demonstration Facility Porous Pavement
The District s LID BMP Testing and Demonstration Facility Porous Pavement
Pervious PCC Pavement
Pervious AC Pavement
Pervious PCC Pavement #57 Stone and Class II Permeable Base Filtration Pervious Pavement Reservoir layer Filter layer (flat & level) Subdrain layer
Pervious AC Pavement #57 Stone and Class II Permeable Base Filtration
Pervious AC Pavement #57 Stone and Class II Permeable Base Filtration
Pervious PCC Pavement #57 Stone Reservoir
Pervious Pavement and Landscape Filter Basin Retrofit Location
Landscape Filter Basin
Landscape Filter Basin
Raised Filtration Planters
Raised Filtration Planters
LID BMPs Testing and Demonstration
LID BMPs Testing and Demonstration Aerial Deposition Pan
LID BMPs Testing and Demonstration Satellite Testing Stations Aerial Deposition Pan Main Testing Station
Main Testing Station Schematic LID BMP Drainage Conduit Sampling Bays Automated Testing Facility Housing Infiltration Basin Water Surface at Water Quality Volume
Main Testing Station Schematic
LID BMPs Total Project
The District s LID BMP Testing and Demonstration Facility 1. Project Background 2. Existing Site Overview 3. LID BMP Demonstration Features (no associated testing) 4. LID BMP Demonstration and Testing Features 5. Anticipated Test Data 6. Design Phase Challenges
Why we expect Volume reduction: Standard extended detention basins disappear about a third of the volume routed through them. The Seattle Street Edge Alternative Project showed a 98% reduction in runoff volume (and those swales have impervious liners!)
Why we expect Volume reduction: Standard extended detention basins disappear about a third of the volume routed through them. The Seattle Street Edge Alternative Project showed a 98% reduction in runoff volume (and those swales have impervious liners!) LID BMPs need more quantitative studies on volume reduction.
What Will Be Tested (hydromodification)? Precipitation / Inflow Hydrograph
What Will Be Tested (hydromodification)? Lag Effects Outflow Hydrograph
What Will Be Tested (hydromodification)? Volume Reduction Demonstrate that A 1 > A 2 and quantify results A 1 A 2
We added a DIY Monitoring Well
The District s LID BMP Testing and Demonstration Facility 1. Project Background 2. Existing Site Overview 3. LID BMP Demonstration Features (no associated testing) 4. LID BMP Demonstration and Testing Features 5. Anticipated Test Data 6. Design Phase Challenges
Infiltration Rates The best we can do??? The Geotechnical Engineer Recommended 2 inches/hour
Porous Pavement Surprise finding The pavement is not the limiting factor for the water quality event. Rates for porous pavements are often documented at hundreds of inches per hour. Long term studies often show inch/hour rates in double figures. Paver systems appear credible for long term rates at least 5 inches per hour. Based on the math, Porous Pavement BMP footprint sizing becomes the same as Infiltration Trenches
Specify the right material for the Rock Reservoirs
Landscape Filter Basin
Evolution of a Curb
Evolution of a Curb Deep curbs solved the saturated subgrade issue
Evolution of a Curb But what about surcharge?
Evolution of a Curb
Landscape Filter Basin Grade separation in parking lots needs to be considered too. Even small drops worry the people that stamp drawings.
Landscape Filter Basin Grade separation in parking lots needs to be considered too. Even small drops worry the people that stamp drawings.
Maximizing basin volume...
...may introduce safety issues
Fencing the BMP is one possible solution
or
Minimizing grade change would work as well.
We ended up with a low fence
Who designs the dirt? Scientist??? Landscape Architect?? Engineer?
Who designs the dirt? Maybe all of us... Engineer? What will it cost if we spec it? Landscape Architect?? Will plants survive in it if we spec it? Scientist??? Will it remove pollutants if we spec it?
Take Away Points This project is unique, purpose-built for monitoring We will collect data on both quality and quantity, before and after treatment We believe that LID features provide substantial volume reduction. We hope to quantify this. Many issues related to LID site design are site specific and require thought and judgment a standard drawing may not be adequate Test data will be made publicly available accessible through the District s website Because the District site is used for training, these features will be available to the public for tours Questions?