Spreadsheet Tools for Quantifying the Costs and Benefits of Two-Stage Channels

Transcription

1 Spreadsheet Tools for Quantifying the Costs and Benefits of Two-Stage Channels J. Witter, A. Ward, D. Mecklenburg, J. D Ambrosio, S. Roley, and J. Tank AWRA Agricultural Hydrology and Water Quality II St. Louis, MO March 25, 2013

2 Decision Aids and Design Tools Assessment Reference Reach Spreadsheet Benefits Instream Nitrogen Tool Costs Two-Stage Ditch Cost Estimator Two-Stage Ditch Economic Analysis Design Two-Stage Cross Sections Bank Stability and Toe Erosion Model

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4 Assessment: Reference Reach Spreadsheet Powell, G.E., A.D. Ward, D.E. Mecklenburg, and A.D. Jayakaran Two-stage channel systems: Part 1, a practical approach for sizing agricultural ditches. JSWC 62(4):

5 Assessment: Reference Reach Spreadsheet Profile Pattern Materials Dimension

6 Assessment: Reference Reach Spreadsheet Profile Sheet: Longitudinal Slope Profile

7 Assessment: Reference Reach Spreadsheet Meander Pattern - Channel Plan Form This Worksheet 1) This sheet will graph the distance and azmuth entered in the profile worksheet. 2) Fill in the values below using the graphed pattern, arial photos, topo maps, etc. 3) Before printing the graph, its width or height may need adjusting. "Square" the graph by clicking and dragging. Meander Length min max meander length (ft) More Info Dogskin Run Little Muskingum Marietta Unit WNF East West Distance Meander Width belt width (ft) Bends amplitude (ft) radius (ft) arc angle (degrees) North South Distance Sinuosity stream length (ft) valley length (ft) Graph Format Z scale: 10 Dimensions (ft) Ratios Bankfull Width: 31.0 Sinuosity: 1.4 show banks Meander Length: 280 ( ) Meander Length Ratio: 9 ( ) Belt Width: 135 ( ) Meander Width Ratio: 4.4 ( ) show centerline Radius of Curvature: 70 (40-80 ) Radius / BkF Width: 2.3 ( ) Reference Reach Stream: Dogskin Run Watershed: Little Muskingum Location: Marietta Unit WNF Latitude: Longitude: County: Munroe Date: June 24, 2002 Observers: Dan Mecklenburg, Dawn Farver, Andy Ward, Pam Stackler, Michelle Channel Type: C4 Drainage Area (sq.mi): 2.94 Pattern typical min max bankfull width (ft) meander length (ft) belt width (ft) amplitude (ft) radius (ft) arc angle (degrees) stream length (ft) valley length (ft) Sinuosity 1.4 Meander Length Ratio Meander Width Ratio Radius Ratio Pattern Sheet: Meander Plan Form

8 Assessment: Reference Reach Spreadsheet Two Individual Pebble Counts Weighted Pebble Count Sieve Analysis for Two Bulk Samples Materials Sheet

9 Assessment: Reference Reach Spreadsheet Dimension Sheet: Cross sectional dimension X-section 1 X-section 2 X-section 8

10 Assessment: Reference Reach Spreadsheet Distance Foresight (Rod Reading)

11 Cross Section 3 Assessment: Reference Reach Spreadsheet Elevation (ft) Dogskin Run, Riffle Width (ft) Bankfull Dimensions Flood Dimensions Materials 83.0 x-section area (ft.sq.) W flood prone area (ft) 39 threshold grain size (mm): 49.6 width (ft) 2.6 entrenchment ratio 43 D50 Riffle (mm) 1.7 mean depth (ft) --- low bank height (ft) 72 D84 Riffle (mm) 2.8 max depth (ft) --- low bank height ratio 51.3 wetted parimeter (ft) 1.6 hyd radi (ft) 29.6 width-depth ratio Bankfull Flow Flow Resistance Forces & Power 5.2 velocity (ft/s) Manning's roughness 0.78 channel slope (%) discharge rate (cfs) 0.12 D'Arcy-Weisbach fric shear stress (lb/sq.ft.) 0.72 Froude number 8.1 resistance factor u/u* 0.64 shear velocity (ft/s) 7.1 relative roughness 4.2 unit strm power (lb/ft/s)

12 Assessment: Reference Reach Spreadsheet Comment Boxes explain equations, links or instructions

13 Benefits: Instream Nitrogen Tool Existing System

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16 Benefits: Instream Nitrogen Tool Proposed Two-Stage System

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21 Benefits: Instream Nitrogen Tool Denitrification Rates

22 Benefits: Instream Nitrogen Tool Hydrology

23 Benefits: Instream Nitrogen Tool Watershed Characteristics and Management

24 Benefits: Instream Nitrogen Tool Results Nitrogen Distribution 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% Trapezoidal Two-Stage Total Export (lbs) Bed (lbs) Bench - Saturated (lbs) Bench - Unsaturated (lbs) Side Slopes (lbs) Buffer (lbs) Land Conversion (lbs) N Removed (lbs) Trapezoidal Two-Stage Bed (lbs) Bench - Saturated (lbs) Bench - Unsaturated (lbs) Side Slopes (lbs) Buffer (lbs) Land Conversion (lbs)

25 Costs: Two-Stage Ditch Cost Estimator 1. Ditch Geometry

26 Costs: Two-Stage Ditch Cost Estimator 2. Earthwork

27 Costs: Two-Stage Ditch Cost Estimator 3. Tiles Outlets and Erosion Control Measures Outlet Protection Drop Structures Sloped Outlets Rock Chutes Berming Rip Rap Instream Structures

28 Costs: Two-Stage Ditch Cost Estimator 4. Seed and Seeding Costs

29 Costs: Two-Stage Ditch Cost Estimator 5. Land Value & Profitability

30 Costs - Two-Stage Ditch Cost Estimator 6. Maintenance Costs Mowing Spraying Clean Out

31 Costs: Two-Stage Ditch Economic Analysis

32 Design: Two-Stage Cross Section Plots Regional Geometry New Channel Dimensions Profile Cross Sections

33 Design: Two-Stage Cross Section Plots Existing Distance Rod Reading Proposed

34 Design: Two-Stage Cross Section Plots Cross Section 3 Earthwork Balance: cut 382 sq.ft. Bench Elevation: ft Width (ft) Elevation (ft)

35 Design: Bank Stability and Toe Erosion Model 1. Channel Form

36 Design: Bank Stability and Toe Erosion Model 2. Vegetation and Bank/Toe Protection

37 Design: Bank Stability and Toe Erosion Model 3. Soil Physical Properties and Erodibility

38 Design: Bank Stability and Toe Erosion Model 4. Bank Stability

39 Design: Bank Stability and Toe Erosion Model 5. Hydraulic Erosion

40 Contact Information Jon Witter (614) Andy Ward (614) Jessica D Ambrosio dambrosio.9@osu.edu (614)