Preliminary Design of Galvez Estates Subdivision
Preliminary Design of Galvez Estates Subdivision
Summary of TopicsIntroductionGeneral Site InformationSanitary Sewer DesignDesign of SubdivisionHydrologic AnalysisTraffic ImpactReferences
General Site Location
LA 42
General Site InformationDevelopment Site: Tracts A & BDevelopment Size: 47.9 AcresLot Size: 70x150Minimum Number of Lots: 100Land Cost: $30,000/acreConstruction Cost: $450/linear foot of streetProfit Goal: >$2.5 million
Sanitary-Sewer DesignPipe Size Design Based on:Peak Flowrate
Mannings with PVC Pipes Flowing Half-Full
Qpeak = 1.69 cfs
Diameter = 1.7 ~ 2Per EBR: Minimum Pipe size = 8
Sanitary-Sewer DesignVelocity Requirements
Minimum Velocity = 2 fpsMaximum Velocity = 10 fps
Mannings with PVC Pipes Flowing Half-Full
V = 2.4 fps
Sanitary-Sewer Design
Design of Subdivision
Design of SubdivisionLot size of 70x 150Lot frontage along Curved Right of Ways held to 70 at building lineBuilding Lines held to 25122 lotsCurb and gutter with subsurface drainage
Design of SubdivisionRoad Design
12 feet utility servitude outside 50 ft right-of-way
Surfaced with 3asphalt cement over 12 soil cement sub base
Road designed above Base Flood Elevation of 18
Minimum road slope of 0.4%
Road Cross Section
Preliminary EarthworkCUTFILLPOND96,500 C.Y.-------ROADWAYS8,700 C.Y.1,900 C.Y.LOTPADS--------T.B.D.
Drainage DesignSite ConditionsTopographySoil TypesFlood ZonePre-Development DrainagePost-Development DrainageFill MitigationDesign Storm
Soil TypesCalhoun Silt Loam 81.1% of SiteDeerford-Verdun Complex 17.9% of SiteOlivier Silt Loam 1% of Site
Predominately Hydrologic Group D
FEMA F.I.R.M.
FIRM Panel#2205C0035EFlood Zones AE & XBFE=18.0
Pre-Development
Catchment Area 1DischargeRational MethodWeighted Runoff Coefficient, C = 0.32Intensity, I = 4.0 in/hr (EBR Drainage Manual)Area, A = 47.2 Ac (Includes 7 Ac of adjacent land)
Pre Development Discharge, Q = 60.4Post Development
Fill MitigationNot an Issue
Majority of Site is above Base Flood Elevation1,100 C.Y. of Storage Loss due to Fill
Pond Normal Pool Below B.F.E.B.F.E.=18.0Normal Pool = 13.75Potential for >30,000 C.Y. of Storage Offsets Loss due to FillDesign Storm10 yr, 24 hr EventTotal Rainfall = 8.5 (EBR Drainage Manual)Modeled in HydroCADSCS - Type III Event
Post-Development HydrographCurrent Site ConditionsRoute: LA0042milepoint: 19.61station: 205510Year ADT2007 12566
Route: LA0933milepoint: 0.82station: 205530Year ADT2007 - 5684
Traffic Impact Analysis
(Per Institute of Transportation Engineers Trip Generation Model)Design Vehicle S-Bus36Minimum Design Turning Radius = 38.9Centerline Turning Radius = 34.9Minimum Inside Radius = 23.8
Galvez Boulevard @ La 932
La 932Galvez BoulevardPermitsLousiana DOTD Right Of Way PermitsHighway Access, Utilities, Vegetation
Department of Health And HospitalsSanitary Sewer, Onsite Treatment
Ascension ParishSubdivision Permit
ReferencesEast Baton Rouge Parish Unified Development CodeTrip Generation Institute of Transportation Engineers - 6th EditionGoogle Mapswww.DOTD.Lousiana.govAASHTO Guide for Design of Pavement Structures
Sheet1Column1Column2Column3Column4Column5Column6Column7Column8Single Family Detached Housing - 122 Dwelling UnitsAvg. Trip Ends on a:Trip EndsInOutWeekday, between 7 and 9 a.m.T = 0.700(X) + 9.477952471Weekday, between 4 and 6 p.m.Ln(T) = 0.901 Ln(X) + 0.5271298247Saturday, peak hourT = 0.886(X) + 11.0651176354Sunday, peak hourT = 0.756(X) + 23.8151166254
Sheet2
Sheet3
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