docFowl River and D`Olive - Mobile Bay National Estuary Program
download 
Report Transcription
Fowl River and D`Olive - Mobile Bay National Estuary Program
Research Elements Water Quality Land Sediment Use Study Coastal Research Status of Watershed Project/Restoration Opportunities FOWL RIVER FOREVER www.fowlriverforever.org WATERSHED INFORMATION HAS BEEN DIGITIZED • Data inventory and creation of GIS database • Delineation of eight subwatersheds • Analysis of land use/land cover • Population trend analysis (planning for future conditions) SAMPLE NETWORK • A sampling network has been established • Samples are being collected during representative flow conditions • Sample locations represent specific parts of the basin • Sample analyses should correlate to land use/land cover effects FOWL RIVER FOREVER www.fowlriverforever.org Sampling Parameters Include: Alkalinity Ammonia as N Anionic surfactants as MBAS Bacteria Genetic Mapping Carbonaceous biochemical oxygen demand Chloride Dissolved Reactive Phosphorous FOWL RIVER FOREVER CO2-Free Flow Land Use Dissolved Oxygen Depth Chlorophyll – a www.fowlriverforever.org Sampling Parameters Include: Fluoride Salinity Total residual chlorine Specific Conductance Nitrate as NO2 Nitrite as NO2 Total Kjeldahl Nitrogen Nitrate as N FOWL RIVER FOREVER Total nitrate-nitrite as N Total Phosphorous as P Light Attenuation Sulfate Temperature Particulate Organic Matter Total nitrate-nitrite as NO3 www.fowlriverforever.org Sampling Parameters Include: Iron Recoverable Phenols Selenium Silica Magnesium Molybdenum Nickel Zinc Lead Lithium Manganese FOWL RIVER FOREVER Potassium Total Petroleum Hydrocarbons Total residual chlorine Total suspended solids Sodium Vanadium Strontium Total Dissolved Solids Turbidity Thallium www.fowlriverforever.org LANDUSE PERCENTAGES FOWL RIVER FOREVER www.fowlriverforever.org LAND USE PERCENTAGES BY SUBWATERSHED PROJECT GOALS determine cause and effect (correlate water quality to land use/land cover) identify restoration/preservation opportunities prioritize projects implement projects monitor results and modify if necessary FOWL RIVER FOREVER www.fowlriverforever.org Coastal Research: Preliminary Findings FOWL RIVER FOREVER www.fowlriverforever.org Fowl River Shorelines 1. Problem Identification 2. Shoreline Assessments 3. Conceptual Strategies 4. Long-Term Planning Problem Identification 1. Flow Volume and Speed • Breaching and Erosion of Spits & Islands 2. Boat Wakes • Shoreline & Marsh Erosion • Wave Reflection 3. Sea Level Rise • Conversion to Open Water Shoreline Assessments 1. Types • Marsh (60%) & Veg. Banks (37%) 2. Armoring Extent • About 25% (Bulkhead, Riprap) 3. Zone Classification • Marine (Zone I) • Transition (Zone II) • Fresh (Zone III) 47 Miles of Tidal Shoreline Conceptual Strategies 1. Watershed Strategies • Off-line detention (land acquisition) • Attenuation of peak flows 2. Spits & Islands • Armoring – riprap, sand, vegetation 3. Marshes • Low sills with gaps • Sand and vegetation Long-Term Planning 1. Existing Armoring • Compensatory programs 2. Adaptive Management • Wake zones or buffers 3. Holding the Line 4. Periodic Reassessment Public Outreach: FOWL RIVER FOREVER www.fowlriverforever.org Fowl River Steering Committee Ray Mayhall (Co-chair) Belinda Lott (Co-chair) Johnnie Adams Richard Becker Jack Boatman Casi Callaway Jerry Carl Richard Craig David Evans Elizabeth Evans Julius Foster Frank Gardner Ken Granger Gene Grantham Rose Grantham Rob Harris Ted Henken Brian Hewes Sen. Bill Hightower Jeremiah Kolb Bill Klutz Greg Landry Lamar Lott Cindy McLendon Bill Melton Coy Morgan Joyce Nicholas Barbara Nolan Stan Nolan Matt Orrell Bruce Pfeiffer Jon Porthouse Ray Richardson Rep. David Sessions Sam St. John Randy Shaneyfelt Sam St. John Judy Stout Bonnie Tulley Oliver Washington Harold White Jenny Zimlich Outreach / Publicity • • • • • • • • Business cards Rack cards Website Video Commercial Water bills Billboard Digital Billboard (Fire Dept.) Banners at marinas • • • • • Social Media / Emails (FRACA, Mobile Baykeeper, Bellingrath Gardens, etc.) Schools – robocalls Church bulletins Online Media (AL.com, Next Door.com) TV (WKRG TV5 and Fox10) Public Input is Critical • Public Involvement Meetings • Website What did they tell us? • Ideas and concerns to date • Integration of comments into research PROJECT PARTNERS FOWL RIVER FOREVER www.fowlriverforever.org D’Olive Creek Restoration Project Segments D4-D6 Baldwin County, Alabama Galen Thackston Goodwyn, Mills and Cawood April 21, 2015 PROJECT AREA • • • • 2,100 ± Linear Feet of Stream Daphne, AL Between I-10 and US 90 Restoration and maintenance attempted in the past EXISTING CONDITIONS • On April 29-30, 2014, during a 24-hour, 13.3-inch rain event D’Olive Creek was subjected to a peak discharge of 3,750 cubic feet per second. As a result of this substantial flow, the stream experienced extreme erosion, as the channel headcut and banks widened, depositing, per Dr. Jennings’ assessment, approximately 4,000 tons of sediment downstream and threatening to compromise the interstate crossing upstream. Typical Condition of Stream Banks View of Existing Channel Downstream of I-10 View of Existing Channel PROJECT DESIGN GOALS Objective #1: Reduce the sediment supply within reach Objective #2: Design a stable stream and floodplain capable of handling a discharge of 3,750 cfs (2014 Storm Event) Objective #3: Design a self-sustaining, stable stream PROJECT CONSTRAINTS • • • • • • • • • 1-10 Culverts Hwy 90 Culverts ALDOT Stabilization Telecommunication Lines Soil Conditions Natural Topography of Valley Hydrology Upstream and Downstream Floodplain Expansion and Contraction Net Cut of Materials DESIGN APPROACH • • • Design Flows – Bankfull Discharge – Historical Maximum Allowable Shear Stresses – Floodplain • Short-term • Long-term – Channel Bankfull Dimensions – Area, Width, Depth WATERSHED APPROACH FOR REFERENCE D'Olive Mini-Regional bankfull width, depth, and area curves WATERSHED ANALYSIS • Bankfull Parameters Identified (Area, Width, Depth) • Curve established for Design Morphology Table 100 100 10 Bankfull Area = 21.998x0.61 Coefficient of determination = 0.85 10 Width = 12.72x0.27 Coefficient of determination = 0.54 Depth = 1.74x0.34 Coefficient of determination = 0.70 1 0.1 1 0.1 1 Drainage Area (sqmi) 10 Cross-Sectional Area (ft2) Bankfull Width and Depth (ft) EXPLANATION Bankfull area geometry curve Bankfull width geometry curve Bankfull depth geometry curve Bankfull area survey data Bankfull width survey data Bankfull depth survey data DESIGN MORPHOLOGY • Table Populated by Watershed Analysis • Confirmed by Reference Reaches • Parameters from Watershed Analysis DESIGN MORPHOLOGY IN-STREAM STRUCTURES WOOD TOE ROCK CROSS VANE THRESHOLD RIFFLE LOG DROP WITH BOULDERS J-HOOK CONSTRUCTED RIFFLE 30% DESIGN PLANS 30% DESIGN PLANS DESIGN COMPARISON Design Parameters Channel Sizing Floodplain Slope Sheer stress @ 3,750 cfs Previous design (2009) 18 2 ft 1.8% 5 2 lb/ft Current Design 30% 33 2 ft 0.8% 1.5 2 lb/ft TIMELINE D'Olive Watershed Timeline Responsible Party Objective Estimated Completion Date Actual Completion Date Project Team Preliminary design workshop March 10-12 March 10-12 GMC Pick up reference reach March 16-20 March 10-13 Project Team Design workshop 30% submittal to NEP, NFWF, John Curry & DOT NEP Project Implementation Meeting 1:00-3:00 p.m. March 23-27 March 23-27 4/6 4/6 4/21 4/21 Field verify & model verify 60% submittal to NEP, NFWF, John Curry & Dot 4/27 Submittal to CORPS Add preliminary opinion of cost for NFWF to use @ NFWF board meeting 5/11 GMC GMC Project Team GMC GMC GMC NFWF Board Meeting 5/4 7/6 1st week of August GMC Final plans/specs 9/7 GMC Bid Project 9/7 NEP Select Contractor 12/31 D’OLIVE CREEK RESTORATION QUESTIONS?
