february 24, 2015 presented by: heidi springer, p.e. brian ginter, p.e
TRANSCRIPT
City of SherwoodWater System Master Plan UpdateFebruary 24, 2015
Presented by: Heidi Springer, P.E.
Brian Ginter, P.E.
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Presentation Overview
Purpose of the plan
Existing water system overview
Service area growth and future water needs estimate
Water distribution system analysis
Summary of recommended improvements & capital improvement program
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Purpose of the Plan
Long term guidance document
– Identify current system deficiencies– Plan for facility upgrades– Plan for service area growth and expansion
Comply with state drinking water program requirements
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Existing Water System Overview
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Projected Growth
20-year and saturation development horizons considered for water facility planning
Anticipated growth areas within 20-year horizon
– Existing City Limits
– Tonquin Employment Area (TEA)
– Brookman Annexation Area
– West Urban Reserve
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Existing City Limits
Annual Average Growth
– 1.25% through 2019
– 0.15% through 2024
Saturation in 10 years
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TEA and Brookman
Use 2010 Concept Plan Projections
– TEA - 20-year % developed
– Brookman - saturation in 20 years
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West Urban Reserve
Initial development in 10 years
¼ developed in 20 years
Land uses mirror existing city
10 net units per acre residential
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Future Water Demand
Future water demands forecast based on recent water use trends and projected growth
Residential water demand estimates
– 213 gpd/unit
Non-residential water demand estimates
– 437 gpd/acre
– 45 gpd/job
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Future Water Demand
Updated water demand estimates
Year Average Daily Demand
(mgd)
Maximum Day Demand (mgd)
Current 1.9 3.9
2034 2.9 6.0
Saturation 4.3 9.0
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Future Supply
Additional 4 mgd needed to meet max day demands at saturation development
Future supply anticipated from Willamette River Water Treatment Plant (WRWTP)
Supply development timeline influenced by WRWTP partners
Emergency supply from city wells and Portland
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Water Distribution System Analysis
Storage & Pumping
– Adequate capacity to meet projected demands through the 20-year planning horizon
Pressure Zones
– Service pressure goal = 40 to 80 psi
– Areas of Brookman and West Urban Reserve to be served from proposed future pressure zones
Distribution Piping
– Hydraulic model of system pressure and flow
• Identify system deficiencies• Test facility alternatives
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Capital Improvement Program (CIP) Recommendations
Short-term improvements (next 10 years) - $19.9 million– Willamette River Water Treatment Plant expansion– Resilience plan– SCADA system upgrade– Distribution piping
Long-term improvements (through saturation)- Additional $16.3 million– System expansion– Pipe replacement
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Questions