BEsT MANAGEMENT PRACTICEs HANDbooK - Tahoe BMP

LIST OF FIGURESFigure I-a: Urban Boundaries in the Lake Tahoe Region ...................................................................................4Figure I-b: Decline of Lake Tahoe’s Water Clarity ................................................................................................6Figure I-c: Impervious Cover versus Surface Runoff ...........................................................................................9Figure I-d: Impervious Surfaces Changes to Stream Hydrology ................................................................. 10Figure I-e: Availability of Potential Pollutants on the Land Surface ......................................................... 14Figure 1-a: Runoff Processes ...................................................................................................................................... 1-3Figure 1-b: Hydrologic Processes and Models ................................................................................................ 1-13Figure 2-a: Soil Horizons .............................................................................................................................................. 2-4Figure 3-a: BMP Selection Flowchart .................................................................................................................. 3-12Figure 3-b: Infiltration Basin Sited Between Parking Areas to Collect and Infiltrate Water ..... 3-22Figure 3-c: Offline System ........................................................................................................................................ 3-24Figure 4.1-a: Pervious Concrete ....................................................................................................................................7Figure 4.1-b: Infiltration Basin .......................................................................................................................................8Figure 4.1-c: Infiltration Trench .....................................................................................................................................7Figure 4.1-d: Infiltration Facility ....................................................................................................................................8Figure 4.1-e: Roof Dripline Planter Beds ...................................................................................................................9Figure 4.1-f: Armored Dripline .................................................................................................................................... 10Figure 4.1-g: Subsurface Infiltration System with Pretreatment ...................................................................1Figure 4.1-h: Level Spreader ...........................................................................................................................................6Figure 4.1-i: Vegetated Filter Strip (Conceptual Drawing) ...............................................................................7Figure 4.2-a: Slope Stabilization Alternatives .........................................................................................................2Figure 4.2-b: Willow Wattle ...........................................................................................................................................5Figure 4.2-c: Terrace Retaining Wall ...........................................................................................................................5Figure 4.2-d: Timber Retaining Wall ...........................................................................................................................6Figure 4.2-e: Stacked Rock Wall ....................................................................................................................................7Figure 4.2-f: Riprap Slope Protection .........................................................................................................................5Figure 4.2-g: Slope Bottom Bench ...............................................................................................................................4Figure 4.2-h: Serrations .....................................................................................................................................................4Figure 4.2-i: Contour Furrows ........................................................................................................................................5Figure 4.2-j: Examples of Alternative Grading for Parking Lot Infiltration ................................................5Figure 4.2-k: Grading for Sheet Flow .........................................................................................................................6Figure 4.2-l: Rock Armor – Elevated Structure .......................................................................................................4Figure 4.2-m: Parking Barriers ........................................................................................................................................3Figure 4.3-a: Curb Break ...................................................................................................................................................5Figure 4.3-b: Rolled Curb..................................................................................................................................................6Figure 4.3-c: Outlet Protection ......................................................................................................................................4Figure 4.3-d: Flow Splitter ...............................................................................................................................................3Figure 4.3-e: Slotted Channel Drain ............................................................................................................................4Figure 4.3-f: Pavement Swale ........................................................................................................................................5Figure 4.3-g: Subsurface Drain ......................................................................................................................................4Figure 4.3-h: Rock Lined Swale .....................................................................................................................................5TRPA BMP HandbookList of Figures2012 Page i