ANSWER KEY MGSFlood v WWHM2012 (released 5/15/2015)
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1 ANSWER KEY MGSFlood v WWHM2012 (released 5/15/2015) Name: Date: Module 6.0: Advanced Topics in LID Design: Hydrologic Modeling General instructions: You may model facility dimensions to the nearest half foot. Exercise #1: Modeling Bioretention and Permeable Pavement Site: WSU Extension in Everett 2000 Tower St. Everett, WA Site Design Assumptions: Predominant Soil: Pre-developed Land Cover: Exercise #1a: Bioretention (Water Quality) Till Forest Site: Post-developed Land Cover: Impervious Water Quality Treatment (91% Infiltration) Results: New construction of 5,000 square foot moderately sloped parking lot. Design a bioretention system to provide water quality treatment for all 5,000 sf of parking area. Facility Design Assumptions: Sideslopes: 3:1 Ponding Depth: Freeboard: BSM Thickness: 18 inches BSM Porosity: 40 % effective porosity ( porosity wilting ) (46 % porosity in WWHM) BSM Infiltration Rate: /hour Native Soil Infiltration Rate: 0.5 inches/hour Overflow pipe diameter: 12 inches Assume: No underdrain permitted Square facility geometry Neglect facility footprint in post-developed area 15 minute computational timestep WWHM Everett gage Facility Bottom Area: 49 square feet (7x7) Facility Footprint: 169 square feet (13x13) Percent of Development: 3.38% (top area) (169sf / 5000sf) MGSFlood Puget East 36 Facility Bottom Area: Facility Footprint: Percent of Development: 104 square feet (10.2x10.2) square feet (16.2x16.2) 5.25% (top area) (262sf / 5000sf)
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3 Exercise #1b: Bioretention (Flow Control) Site: Post-developed Land Cover: Impervious Flow Control (match predeveloped flows and durations from 50% 2-year to full 50-year recurrence interval flow) New construction of 5,000 square foot moderately sloped parking lot. Design a bioretention system to provide flow control for all 5,000 sf of parking area. Use same facility assumptions as Exercise 1a. Use a 15 minute computational timestep. Results: MGSFlood Puget East 36 Facility Bottom Area: Facility Footprint: Percent of Development: 615 square feet (24.8x24.8) 949 square feet (30.8x30.8) 18.97% (949sf / 5000sf) 3
4 Exercise #1c: Permeable Pavement Site: Post-developed Land Cover: Impervious/Permeable Pavement Flow Control (match predeveloped flows and durations from 50% 2-year to full 50-year recurrence interval flow) New construction of 5,000 square foot parking lot. Design a moderately sloped permeable pavement facility to provide flow control for 2,000 square feet of permeable pavement (parking stalls) and run-on from 3,000 square feet of adjacent impervious parking area (driving lanes). Facility Design Assumptions: Pavement Area: 2,000 square feet Pavement Slope: 2 % (model as flat without check dams assume design will incorporate check dams to provide required average ponding depth) Pavement Infiltration Rate: 50 inches/hour Gravel Porosity: 30% Native Soil Infiltration Rate: 0.5 inches/hour Use a 15 minute computational timestep. Results: WWHM Everett gage Average Ponding Depth: 0.2 feet MGSFlood Puget East 36 Average Ponding Depth: 0.6 feet 4
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6 Exercise #2: Modeling Green Roofs and Dispersion Site: WSU Extension in Everett 2000 Tower St. Everett, WA Site Design Assumptions: Predominant Soil: Till Pre-developed Land Cover: Forest Exercise #2a: Green Roof Site: Post-developed Land Cover: Green Roof NA New construction of 5,000 square foot green roof. Evaluate performance of Green Roof in MGS Flood and WWHM. Determine how WWHM Green Roof parameters impact 2-year and 25-year flows from the baseline configuration. Use a 15-minute computational timestep. Baseline Green Roof Design Assumptions: Green Area acres Depth of Material 4 inch Slope of Rooftop (ft/ft) Vegetative Cover Ground Cover Length of Rooftop 50 ft Results: MGS Flood Recurrence Interval Flows Puget East 36 2-year: cfs 25-year: cfs WWHM Recurrence Interval Flows Everett gage 2-year: cfs 25-year: cfs WWHM Green Roof Parameter 2-year 25-year Δ from Baseline Green Roof (cfs) (cfs) in WWHM Vegetative Cover Shrubs Lower Slope of Roof 0.02 ft/ft Higher Depth of Material 8 inch Lower Length of Rooftop 100 ft Lower 6
7 Exercise #2b: Green Roof to Bioretention Site: Post-developed Land Cover: Green Roof Flow Control New construction of 5,000 square foot green roof. Design a bioretention system downstream of the green roof to provide flow control for the site. Bioretention Design Assumptions: Sideslopes: 3:1 Ponding Depth: Freeboard: BSM Thickness: 18 inches BSM Porosity: 40 % BSM Infiltration Rate: /hour Native Soil Infiltration Rate: 0.5 inches/hour Overflow Diameter: 12 inch Assume: No underdrain permitted Square facility geometry Neglect facility footprint in post-developed area 15 minute computational timestep Results: MGSFlood Puget East 36 Facility Bottom Area: square feet (23.4x23.4) How does this facility compare to the facility sized in exercise 1b? Smaller / Larger By how much? % 7
8 Exercise #2c: Dispersion Site: Post-developed Land Cover: Impervious NA New construction of 5,000 square foot moderately sloped parking area. Determine the performance of sheet flow dispersion in the adjacent lawn area (5,000 square feet) next to the parking lot. Dispersion Design Assumptions: Option 1: Model parking lot as lateral flow impervious basin routed to a lateral flow soil basin (only available in WWHM). Option 2: Model impervious area as grass. Results: Option 1 Option 2 WWHM Everett gage Unmanaged Surface(s) 10,000sf total -- 5,000 sf lawn, 5,000 sf impervious) 5,000sf impervious 2-year: cfs 2-year: cfs 25-year: cfs 25-year: cfs Dispersed Surface 2-year: cfs 2-year: cfs 25-year: cfs 25-year: cfs Reduction in Recurrence Interval Flows (from unmanaged): 2-year: 53.0% 2-year: 80.6% 25-year: 35.6% 25-year: 62.1% MGSFlood Recurrence Interval Flow Puget East 36 Unmanaged Surface(s) 2-year: cfs 25-year: cfs Dispersed Surface 2-year: cfs 25-year: cfs Reduction in Recurrence Interval Flows (from unmanaged): 2-year: 78.4% 25-year: 53.5% Which technique (green roof or dispersion) better manages low flows (2-year)? MGS Flood: Dispersion WWHM: Option 2 Dispersion > Green Roof > Option 1 Dispersion Which technique (green roof or dispersion) better manages high flows (25-year)? MGS Flood: Dispersion WWHM: Green Roof > Option 2 Dispersion > Option 1 Dispersion Why? 8
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10 Exercise #3: Modeling a Residential Development Site: Hawks Prairie Gold Course 8383 Vicwood Lane Lacey, WA Site Design Assumptions: Predominant Soil: Till Pre-developed Land Cover: Forest Puget West 48 Exercise #3a: Site: Post-developed Land Cover: See Development Plan (attached). Flow Control Results: New construction of single residential lot. Design a bioretention system at the downstream end of the property to provide flow control for the lot. Facility Design Assumptions: Sideslopes: 3:1 Ponding Depth: Freeboard: BSM Thickness: 18 inches BSM Porosity: 40 % BSM Infiltration Rate: /hour Native Soil Infiltration Rate: 0.5 inches/hour Overflow Structure Diameter: 12 inches Assume: No underdrain permitted Square facility geometry Subtract bioretention bottom area from lawn area 5 minute computational timestep MGSFlood Facility Bottom Area: 870 square feet (29.5x 29.5) Parcel Driveway and Walkway sf Roof sf Pre: Forest: ac Post: Grass: ac Imp: ac Bioretention (BMP T7.30) (MR7) Lawn on Till sf 10
11 Exercise #3b: Site: Post-developed Land Cover: See Development Plan (attached). NA Determine performance of List #2 BMPs (see Figure 2) for a single lot. Assume roof area managed by bioretention facility, at-grade impervious managed by permeable pavement, and lawn area flows to the POC unmanaged. Bioretention Design Assumptions: Bioretention Facility Sizing Factor: 5% Sideslopes: 3:1 Ponding Depth: Freeboard: BSM Thickness: 18 inches BSM Porosity: 40 % BSM Infiltration Rate: /hour Native Soil Infiltration Rate: 0.5 inches/hour Overflow Structure Diameter: 12 inches Assume: No underdrain permitted Square facility geometry Subtract bioretention bottom area from lawn area 5 minute computational timestep Permeable Pavement Design Assumptions: Pavement Slope (ft/ft) 0.05 Trench Slope (ft/ft) 0.0 Pavement Infiltration Rate (in/hr) 20 Native Infiltration (in/hr) 0.5 Gravel Porosity (%) 30 Trench Depth (ft) 0.25 Soil Quality and Depth Assumptions: Modeled as Pasture on Till Results: Bioretention Bottom Area: 63.2 square feet (7.95x7.95) Lawn Area (less bio bottom area): 4,536 square feet 2-year peak flow: cfs LID Standard: Pass / Fail 25-year peak flow: cfs Flow Control Standard: Pass / Fail Parcel Driveway and Walkway Permeable Pavement (BMP T5.15) (Concrete) sf Roof Pre: sf Forest: ac Post: Grass: ac Roof: ac Drive: 28.3 x 28.3 Bioretention (BMP T7.30) (MR5) Lawn Soil Quality and Depth (BMP T5.13) sf POC 11
12 Exercise #3c: Site: Post-developed Land Cover: See Development Plan (attached). NA Results: Determine performance of List #2 BMPs (see Figure 3) for the right-of-way adjacent to two lots. Right-of-Way Design Assumptions: Lot Width (ft) 75 Number of Lots 2 Right-of-way Width (ft) 48 Roadway Width (ft) 28 Sidewalk Width (ft) 10 (5 ft both sides of road) Planter Strip Width (ft) 10 Permeable Pavement Roadway and Sidewalk Design Assumptions: Pavement Slope (ft/ft) 0.01 Trench Slope (ft/ft) 0.0 Pavement Infiltration Rate (in/hr) 20 Native Infiltration (in/hr) 0.5 Gravel Porosity (%) 30 Trench Depth (ft) 0.25 Soil Quality and Depth Assumptions: Modeled as Pasture on Till (for planter strip area) MGSFlood 2-year peak flow: 0 cfs LID Standard: Pass / Fail 25-year peak flow: 0 cfs Flow Control Standard: Pass / Fail Right of Way Roadway Permeable Pavement (BMP T5.15) (Asphalt) Lawn Soil Quality and Depth (BMP T5.13) Sidewalk Permeable Pavement (BMP T5.15) (Concrete) POC Pre: Forest: ac Post: Grass: ac Sidewalk: 150 x 10 Drive: 150 x 28 12
13 Exercise #3d: Site: Post-developed Land Cover: See Development Plan (attached). NA Size a regional detention pond to meet the flow control standard for two lots and the right-of-way assuming the facilities used in Exercise 3b and 3c. Regional Detention Pond Design Assumptions: Sideslopes 3:1 Ponding Depth 2 feet Freeboard 12 inches Infiltration none Assume: Single orifice configuration (0.5 inch min. diameter) Area Name Area (sf) Area (acres) Modeled Land Cover/BMP Lot 1 Driveway Permeable Pavement Roof 2, Impervious Lawn 4, Till Pasture Walkway Permeable Pavement Bioretention 120 (WSE) Bioretention Lot 2 Driveway Permeable Pavement Roof 2, Impervious Lawn 4, Till Pasture Walkway Permeable Pavement Bioretention 120 (WSE) Bioretention Right of Way Roadway 4, Permeable Pavement Lawn 1, Till Pasture Sidewalk 1, Permeable Pavement Total Area Results: MGSFlood Facility Bottom Area: 25 square feet (5 x 5 ) (with 1 diameter Orifice) 13
14 Driveway and Walkway Roof Bioretention (BMP T7.30) (MR5) Parcel Permeable Pavement (BMP T5.15) (Concrete) Lawn Soil Quality and Depth (BMP T5.13) Right of Way Roadway Permeable Pavement (BMP T5.15) (Asphalt) Lawn Soil Quality and Depth (BMP Sidewalk Permeable Pavement (BMP T5.15) (Concrete) Centralized Facility Combined Detention and Wetpool (BMP T10.40) (Basic) POC Pre: Forest: ac Post: Roof (2x): ac Drive + Walk (2x): 28.3 x 28.3 Lawn (2x): ac Sidewalk: 150 x 10 Street: 150 x 28 Grass: ac 14
15 Exercise #4: Site: Site: WSU Extension th Street SE Everett, WA Instructions: Review example hydrologic modeling memo and attached WWHM model output report. Identify discrepancies between the memo and the output report and errors in model inputs and/or calculations. Results: Description of Error/Discrepancy Location of Error/Discrepancy
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