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Drainage Master Plan Schultz Flood Area December 7, 2010

2. Agenda. IntroductionHydrology Study Results presented by Chris Dusza with CiviltecNext Steps. 3. Introduction. The consensus of the Ridgeline to Rio Summit = Drainage Master Plan is key short-term action Need to quantify the hazard before designing solutionDrainage Master Plan has two major components: 1. Hydrology = peak discharges; used to size improvements 2. Hydraulics = where the flood waters go, how deep and how fast; used to locate and design impr29991

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Drainage Master Plan Schultz Flood Area December 7, 2010

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    1. 1 Drainage Master Plan Schultz Flood Area December 7, 2010

    2. 2 Agenda Introduction Hydrology Study Results presented by Chris Dusza with Civiltec Next Steps

    3. 3 Introduction The consensus of the Ridgeline to Rio Summit = Drainage Master Plan is key short-term action Need to quantify the hazard before designing solution Drainage Master Plan has two major components: 1. Hydrology = peak discharges; used to size improvements 2. Hydraulics = where the flood waters go, how deep and how fast; used to locate and design improvements

    4. 4 Introduction Civiltec was contracted with in October to study the hydrology of the area at a cost of $31,000 Civiltec completed their analysis December 1 Chris Dusza, with Civiltec, will present the results of the hydrology study

    5. 5 Hydrology Study Results Presented by Chris Dusza with Civiltec Flood flows under this scenario are comparable to a 150 year storm pre-fire Flood flows under this scenario are comparable to a 150 year storm pre-fire

    6. 6 Hydrology Study Results HEC-1 Model - 3 Modeling Scenarios: ? Immediate Post Burn (2010) ? Short-Term Recovery (2015±) ? Long-Term Recovery (2030±) Total Watershed Area ~54 square miles ? Includes Wupatki Trails, Timberline, Fernwood, and Doney Park ? 58 Sub Basins/Concentration Points ? 2 Point Precipitation Positional Values (Upper and Lower Watershed) – NOAA 14 Atlas ? 29 Soil Types - Coconino National Forest Terrestrial Ecosystem Survey ? 9 Land Use Classifications

    7. 7 Hydrology Study Results

    8. 8 Hydrology Study Results

    9. 9 Hydrology Study Results

    10. 10 Hydrology Study Results Modeling Methodology ? Rainfall Events - 2, 10, 25, 50, and 100 year events modeled ? Rainfall Losses – SCS Methodology Used (Curve Numbers, Lag Time) ? Curve Numbers estimated using - Soil Data (HSG) - SCS published tables (TR55) - BAER Tools (Curve Number Supplement) - Discussions with USFS - Field Observations ? Routing – Normal Depth – Modified Puls Channel Routing ? Indirect Methods of Discharge Verification

    11. 11 Hydrology Study Results

    12. 12 Questions?

    13. 13 Next Steps Engineering Firms’ Recommendations: Study results provided to six engineering firms – they are requested to provide input as to 1) the design storm(s) that should be considered for additional modeling, 2) the design standard, and 3) the potential recommendations regarding flood mitigation measures (structural and non-structural) Additional modeling and studies based on comparison of different design storms Model “typical” design storms for winter & summer to understand implications, if any Cinder Lake Capacity Study - USGS

    14. 14 Next Steps Input from Ridgeline to Rio Summit Participants and Other Partners and Agency Stakeholders USFS, ADOT, NRCS, AZDEM/FEMA, ACE Complete Preliminary Drainage Master Plan Use engineering firm recommendations and extract the common potential solutions to create scenarios to consider

    15. 15 Next Steps Public Participation Contract Public Relations firm to support the process Provide public education on hydrology study results Conduct public participation process Incorporate public feedback/input into final Drainage Master Plan Consider/determine solutions for the area: Timeframe, constructability, assumable risk, costs Permits, NEPA, Archeological, utilities, rights-of-way

    16. 16 Next Steps Fiscal Planning Identify authorization and funding sources for potential solutions within the plan- FEMA, FHWA, NRCS, County, State Finalize Drainage Master Plan After considering public feedback, costs and funding, ROWs and other legal and technical considerations, finalize plan and the timeline

    17. 17 Study is Available on the Flood Webpage www.coconino.az.gov/schultzfloodinformation.aspx

    18. 18 Questions?

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