FLAGSTAFF FAMILY FOOD FOOD STORAGE FACILITY FLOODING BANK Erik Henricksen, Elena Smith, Garrett Ribas, and Meshal Alotaibi Client: Joshua Spears TA: Dr. Wilbert Odem 1
BACKGROUND Figure 1: Food Bank Front Entrance Problem Statement – Food Bank is experiencing significant flooding at the entrance of the building. Purpose – Find a solution which will alleviate the flooding. 2 2
LOCATION Figure 3: Aerial View of Food Bank Property Figure 2: Flagstaff Network 3
COLLABORATIO N ❖ Neighboring Companies ➢ Neighborhood Survey ▪ Past and Present Flooding Issue ❖ City of Flagstaff ➢ Rick Barrett, City Engineer ➢ Donna Curry, Engineering Specialist ▪ Official Documents o City Plans Figure 4: Official Documents Example o Elevational Data [2] [3] o Letters o Hydrology Data 4 4
FLOODING High Intensity Flooding Figure 7: BEFORE HEAVY RAIN EVENT [1] Figure 8: DURING HEAVY RAIN EVENT: Monsoon (July and August) [1] 5 5
POTENTIAL FLOODING SOURCE Historic Watershed Figure 5: Watershed Near Humphreys Peak [2] Figure 6: Existing Pipelines Near Food Bank [2] 6 6 6 6 6 6 6
ON-SITE EVALUATION • Understand the physical topography of the property and neighborhood • Determine how water comes onto property • Current flooding alleviation • Determine how water flows off of the property • E. Huntington Rd. elevation compared to Food Bank Property Elevation. Figure 9: North-West Corner of Food Bank Property (Food Bank Property meets E. Huntington Rd.) 7 7
OBSERVED FLOODING Low Intensity Flooding Figure 10: Front Entrance Figure 12: Further Flooding Prevention Figure 11: Front Concrete Barricades (Sandbags) 8 8
PROJECT EVOLUTION ❖ Flooding Area ➢ Neighborhood Assessment ➢ Collaboration with the City of Flagstaff Stakeholders ▪ Liability ▪ Legal Terms: Property rights, ▪ right of way, ADOT 9 9 9 9 9 9 9 9 Figure 13: Property Breakdown
SURVEYING: Planning Figure 16: Surveying Property Figure 14: On-site Evaluation Figure 15: Survey Point Grid 10 10 1 10 10 10 0
SURVEYING: Topographical Map Figure 17: Topographic Map of Figure 18: Topographic Map of Property W/ Food Bank 11 11 11 11 11 11 11 11 Property Buildings
CODES AND STANDARDS ❖ City of Flagstaff ❖ Title 13 – Engineering Stormwater Management Design Standards and Design Manual (2000) Specifications for New [4] Infrastructure ➢ Chapter 3: Hydrology ➢ Chapter 5: Culverts ➢ Chapter 6: Pavement Drainage ❖ 13-08-001-0001 ➢ Chapter 7: Storm Drains ➢ Chapter 8: Storage and STORMWATER Detention Facilities MANAGEMENT ➢ Chapter 10: Erosion and • “The design and construction of all Sediment Control public and private stormwater ➢ Chapter 11: Energy Dissipaters [4] management facilities shall be in [4] accordance… with the City of Flagstaff Stormwater Management Design Manual and these 12 12 1 12 12 12 Standards.” 2
HYDROLOGY ANALYSIS [5] [4] [6] NOAA Atlas 14 Coconino County City of Flagstaff Data Maps Online Stormwater Management Rainfall Intensities Property Boundaries Design Manual Rationale Formula Partially Full Flowing Pipes Criteria Runoff Coefficients 13 13 13 13 1 13 13 13 13 13 3
STORMWATER RUNOFF EVALUATION Table 1: Runoff Intensity, NOAA Atlas 14 [5] Figure 19: Area of Property (Red) 14 14 14 14 14
DESIGN CALCULATIONS • Figure 20: Hydraulic Elements Calculations 15 15 15 15 1 15 15 15 15 15 5
DESIGN CALCULATIONS Figure 22: Verification Calculations Figure 21: Pipe Sizing Calculations Using Q 16 16 16 1 16 16 16 16 16 16 16 6
DESIGN CALCULATIONS Retaining Wall Calculations Table 3: FS for Overturning = 3.3 > 2 Table 4: FS for Sliding = 1.73 > 1.5 Table 5: FS for Bearing Capacity = 7.22 > 3 17 17 17 1 17 17 17 17 17 17 Figure 23 : Stability Failure Checks for Retaining 17 7 Walls [7]
Design Option 1 Design Option 1: Retaining Wall W/ Commercial Drainage System Figure 25: Design Option 1 Retaining Wall 18 18 18 Figure 26: Aerial View of Design 1 18 18 18 18 18 Detail Option 1 8
Design Option 1 Details Design Option 1: Retaining Wall W/ Commercial Drainage System Figure 28: Top and Side View of Figure 27: Design Option 1 Cross 19 19 19 1 19 19 19 19 19 Commercial Drain Sectional View 9
Design Option 2 Design Option 2: Retaining Wall W/ Valley Gutters Figure 30: Aerial View of Design Figure 29: Design Option 2 Retaining Wall 20 20 20 2 20 20 20 20 20 Option 2 Detail 0
Design Option 2 Details Design Option 2: Retaining Wall W/ Valley Gutters Figure 30: Design Option 2 Valley Gutter Detail 21 21 21 2 21 21 21 21 21 1
Pros and Cons Figure 31: Figure 32: Design 1 Design 2 22 22 22 2 22 22 22 22 22 2
Offsite Recommendations to City of Flagstaff ❖ Initiate the Vegetated Swale Design ❖ Increase Catch Basin Size ❖ Additional Catch Basins ❖ Continued Maintenance Figure 33: City of Flagstaff Stormwater Division Retention Basin Design 23 23 23 2 23 23 23 23 23 3
ECONOMICS 24 24 24 24 2 24 24 24 24 24 4
PROJECT IMPACT Final Design No Alleviate Food Bank Governmenta Flooding l Impacts Avoid Continue Neighbo to Serve ADOT r Runoff Public Avoid Front City of Entry Flagstaff Flooding Avoidance of Future Flooding 25 25 25 25 25 25 Figure 34: Project Impact Flow 25 Chart
STAFFING HOURS 26 26 26 2 26 26 26 26 26 6
PROJECT SCHEDULE 27 27 27 2 27 27 27 27 27 7
COST ❖ Within 10% Difference ❖ Senior Engineer vs. Engineer ❖ $840.00 Difference 28 28 28 2 28 28 28 28 28 8
REFERENCES [1](2016) Donna Curry, Engineering Specialist [2](2016) Rick Barrett, City of Flagstaff, City Engineer [3] (2016). City of Flagstaff. Available: http://www.flagstaff.az.gov/. [4] (July 2000) City of Flagstaff Engineering Division, "Stormwater management," in City of Flagstaff Stormwater Design Manual Anonymous City of Flagstaff, pp. 43. [5] (August 27, 2014). NOAA ATLAS 14 POINT PRECIPITATION FREQUENCY ESTIMATES: AZ [NOAA Atlas 14]. Available: http://hdsc.nws.noaa.gov/hdsc/pfds/pfds_map_cont.html?bkmrk=az. [6](2016). County Maps [Coconino Parcel Viewer]. Available: https://gismaps.coconino.az.gov/ParcelViewer/. [7] (2016). CE-RE. Available: http://www.ce- ref.com/Foundation/Retaining_wall/Retaining_wall.html 29 29 29 2 29 29 29 29 29 9
THANK YOU ANALYSIS RESEARCH DESIGN 30
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