SEWER SYSTEM INVESTMENT/PLANNING

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Presentation OutlineThe Benefits of Sewer System Planning Sewer System Planning BasicsA Case Study

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BenefitsPreservat ion of alignment routes Out fall and downline cost allocat ionGrowth/Landuse influence/controlEconomic development investment

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Sewer System Planning Basics

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Intersect GIS Layers to Create Development Constraints Wetlands Flood Plain Stream Buffers Occupied Property Low Structure Value Property Land Use / Zoning Designation /

Density

Results Developable Acres by Land Use 3,000 Monthly Demand per ERU Total Sewer Demand by Analysis

Zone

IDENTIFY POTENTIAL GROWTH AREAS

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Growth Area Indicators Red = High Density Rat io Orange = Med-High Density Rat io Yellow = Med-Low Density Rat io Green = Low Density Rat io

Flow Project ions ERU = 100gpd Apply Growth Project ions to Sewer

Demands

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Create Sewer Analysis Zones Using Elevation & Natural

Boundaries

Elevation (Color Mapped) Major Roadway Boundaries Sanford ETJ 2 Mile ETJ Buffer Project Area Traffic Analysis Zones Common Geographic Areas

Case Study –Kernersville Sewer System Investment Plan (SSIP)

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The Basics

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Area 25

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Area 25

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Area 25

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Area 25

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Area 25

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Area 25

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$200/ft for Gravity Construct ion (based on 8-inch ductile iron)$2,500 per Manhole (spacing used was 300 ft )$300,000 for each Pump Stat ion (85 GPM size)$60/ft for Force Mains (based on 4-inch diameter)$600/ft for Bored Crossings$300/ft for Stream Crossings$3/ft for Permanent Easements$1.50/ft for Temporary Easements

Costs considerations

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Questions

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