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Storm Analysis and Design

Storm Analysis and Design. Prepared for Riverton City 4/13/14 CGM Consultants. Riverton City is a rapidly growing city in Salt Lake County. Many new subdivisions are projected for development in the upcoming years.

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Storm Analysis and Design

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  1. Storm Analysis and Design Prepared for Riverton City 4/13/14 CGM Consultants

  2. Riverton City is a rapidly growing city in Salt Lake County. • Many new subdivisions are projected for development in the upcoming years. • To minimize construction costs, an alternative storm water design has been requested by the city. Problem Statement

  3. The results of this project are a preliminary analysis and design for typical subdivisions in Riverton City • Royal Farms is a representative subdivision found in Riverton City, and was used for the analysis in this project. Scope

  4. Royal Farms Subdivision is a 29.8 acre subdivision located East of Bangerter Highway. Royal Farms Subdivision

  5. Time of Concentration: 10 minutes Runoff Volume: 5,500ft3 Pre-Development Runoff

  6. Time of Concentration: 18 minutes Runoff Volume: 23,280ft3 Post-Development Runoff

  7. Pre- and post-development runoff volumes from the 10 year storm were analyzed using Watershed Modeling Systems (WMS). • According to NOAA, The 10 year storm precipitation was estimated to be 1.24 inches of rainfall. • From WMS, the pre-development runoff volume was found to be about 5,500cubic feet. • The post-development runoff volume was found to be 23,280cubic feet. • The low impact design (LID) for the representative subdivision must hold the difference of these volumes, or 17,780cubic feet. Runoff Comparison

  8. Pre-Development Runoff: 23,280ft3 Post-Development Runoff: 5,500 ft3 Difference: 17,780ft3 Runoff Comparison

  9. The Design AutoCAD

  10. Used a file provided by Riverton City as our template Template

  11. Swale design • Width • Location • Swale entry • Roadway design • Traveled way • Dividing side treatment Parameters

  12. The design called for a swale with a width of 5.5 feet along the sidewalk • Swales are not to intersect with driveways • Meant for the roadway runoff • Have inlets between driveways Swale

  13. Between property lines are 54’ • 29’ of designated roadway • 2% grade on the normal crown and sidewalks • 12.5’ of side treatment on each side • Includes: • Sidewalk 6ft • Swales 5.5 ft • Curbs 1ft Roadway

  14. CAD Drawings

  15. Typical driveway of 30ft width • 70% of properties have 30ft width, vs 16ft • Sidewalk adjacent to and leading to the house Ideal Lot

  16. Dimensions are in feet 5.5000 6.0000 Close up of Swale

  17. Swale

  18. Swales added to every roadside Development

  19. Before and After

  20. Before and After

  21. Cost Benefit Analysis

  22. Simulated Development Agreement • Storm Drain and Irrigation • Cost Savings of 17% Non-Conservative Cost Benefit Analysis

  23. Arbitrary Runoff Coefficient • Pre- versus Post- Land Use Criteria • 1.8% Grade Sloping Eastward • Rational Method Verified • Approximated Using NRCS Curve Method • Hydraulic Radius • 0.375 ft for 18” pipe • Cost-Benefit Analysis Errors Limitations and Assumptions

  24. Property/Easement Issues • HOA Regulations • Public Nuisance • Sand Filters Evaluating Product Quality & Deliverables

  25. 4.3.1 Graduate Student Advisor • Adam Eccles, 713.838.5051, aeccles@byu.edu • 4.3.2 Faculty Supervisor • Dr. Gus Williams, 801.208.3137, gwilliams@et.byu.edu • 4.3.3 Project Manager • Mason Adamson, 509.551.1565, mason.adamson88@gmail.com • 4.3.4 Design Team Leader • Carter Livingston, 760.458.6449, carterlivingston1@gmail.com • 4.3.5 Engineer 1 • Greg Sanchez, 609.865.5282, greg.h.sanchez@comcast.net CGM Consultants

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