February 24, 2015 Presented by: Heidi Springer, P.E. Brian Ginter, P.E.

2  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

3  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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5  20-year and saturation development horizons considered for water facility planni ng  Anticipated growth areas within 20-year horizon – Existing City Limits – Tonquin Employment Area (TEA) – Brookman Annexation Area – West Urban Reserve

6  Annual Average Growth – 1.25% through 2019 – 0.15% through 2024  Saturation in 10 years

7  Use 2010 Concept Plan Projection s – TEA - 20-year % developed – Brookman - saturation in 20 years

8  Initial development in 10 years  ¼ developed in 20 years  Land uses mirror existing city  10 net units per acre residential

9  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

10  Updated water demand estimates YearAverage Daily Demand (mgd) Maximum Day Demand (mgd) Current Saturation4.39.0

11  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

12  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

13  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 replacemen t

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