february 24, 2015 presented by: heidi springer, p.e. brian ginter, p.e

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