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Preliminary Design of Galvez Estates Subdivision

Preliminary Design of Galvez Estates Subdivision. Summary of Topics. Introduction General Site Information Sanitary Sewer Design Design of Subdivision Hydrologic Analysis Traffic Impact References. LA 42. General Site Location. General Site Information. Development Site: Tracts A & B

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Preliminary Design of Galvez Estates Subdivision

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  1. Preliminary Design of Galvez Estates Subdivision

  2. Summary of Topics Introduction General Site Information Sanitary Sewer Design Design of Subdivision Hydrologic Analysis Traffic Impact References

  3. LA 42 General Site Location

  4. General Site Information Development Site: Tracts A & B Development Size: 47.9 Acres Lot Size: 70’x150’ Minimum Number of Lots: 100 Land Cost: $30,000/acre Construction Cost: $450/linear foot of street Profit Goal: >$2.5 million

  5. Sanitary-Sewer Design • Pipe Size Design Based on: • Peak Flowrate • Manning’s with PVC Pipes Flowing Half-Full Qpeak = 1.69 cfs Diameter = 1.7” ~ 2” Per EBR: Minimum Pipe size = 8”

  6. Sanitary-Sewer Design • Velocity Requirements • Minimum Velocity = 2 fps • Maximum Velocity = 10 fps Manning’s with PVC Pipes Flowing Half-Full V = 2.4 fps

  7. Sanitary-Sewer Design

  8. Design of Subdivision

  9. Design of Subdivision Lot size of 70’x 150’ Lot frontage along Curved Right of Ways held to 70’ at building line Building Lines held to 25’ 122 lots Curb and gutter with subsurface drainage

  10. Design of Subdivision • Road Design • 12 feet utility servitude outside 50 ft right-of-way • Surfaced with 3”asphalt cement over 12” soil cement sub base • Road designed above Base Flood Elevation of 18’ • Minimum road slope of 0.4%

  11. Road Cross Section

  12. Preliminary Earthwork

  13. Drainage Design • Site Conditions • Topography • Soil Types • Flood Zone • Pre-Development Drainage • Post-Development Drainage • Fill Mitigation • Design Storm

  14. Soil Types • Calhoun Silt Loam • 81.1% of Site • Deerford-Verdun Complex • 17.9% of Site • Olivier Silt Loam • 1% of Site • Predominately Hydrologic Group D

  15. FEMA F.I.R.M. • FIRM Panel# 2205C0035E • Flood Zones “AE” & “X” • BFE=18.0’

  16. Pre-Development

  17. Catchment Area 1 Discharge • Rational Method • Weighted Runoff Coefficient, C = 0.32 • Intensity, I = 4.0 in/hr (EBR Drainage Manual) • Area, A = 47.2 Ac (Includes 7 Ac of adjacent land) • Pre Development Discharge, Q = 60.4

  18. Post Development

  19. Fill Mitigation • Not an Issue • Majority of Site is above Base Flood Elevation • 1,100 C.Y. of Storage Loss due to Fill • Pond Normal Pool Below B.F.E. • B.F.E.=18.0’ • Normal Pool = 13.75’ • Potential for >30,000 C.Y. of Storage Offsets Loss due to Fill

  20. Design Storm • 10 yr, 24 hr Event • Total Rainfall = 8.5” (EBR Drainage Manual) • Modeled in HydroCAD • SCS - Type III Event

  21. Post-Development Hydrograph

  22. Current Site Conditions Route: LA0042 milepoint: 19.61 station: 205510 Year – ADT 2007 – 12566 Route: LA0933 milepoint: 0.82 station: 205530 Year – ADT 2007 - 5684

  23. Traffic Impact Analysis (Per Institute of Transportation Engineers’ Trip Generation Model)

  24. Design Vehicle S-Bus36 Minimum Design Turning Radius = 38.9’ Centerline Turning Radius = 34.9’ Minimum Inside Radius = 23.8’

  25. Galvez Boulevard @ La 932 La 932 Galvez Boulevard

  26. Permits • Lousiana DOTD • Right Of Way Permits • Highway Access, Utilities, Vegetation • Department of Health And Hospitals • Sanitary Sewer, Onsite Treatment • Ascension Parish • Subdivision Permit

  27. References East Baton Rouge Parish Unified Development Code Trip Generation – Institute of Transportation Engineers - 6th Edition Google Maps www.DOTD.Lousiana.gov AASHTO Guide for Design of Pavement Structures

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