2013 Water System Plan, Volume II - Seattle City Clerk's Office - City ...

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The major supply transmission pipelines from the Cedar and Tolt sources deliver water to wholesale customer master meters and intertie locations, such as the City of Tukwila. Transmission pipelines deliver water to various tanks, standpipes, and reservoirs throughout the system and on occasion directly to the distribution system. Twelve reservoirs and 14 tanks comprise the in-town storage facilities. Water from the in-town facilities is distributed to customers via the distribution system. 5.2.3.2 Distribution System The SPU water distribution system contains more than 1,690 miles of water mains. These mains vary in diameter from 4 inches to greater than 30 inches. Most SPU water mains are unlined or mortar-lined cast iron, ductile iron, or steel pipe. Seattle’s water distribution system also includes 15 pump stations and more than 180,000 water service lines and meters serving residential and non-residential properties. Generally, both transmission and distribution mains passing under railroads or similar facilities are encased. Most pipelines do not have corrosion protection. See Chapter 6, Cathodic Protection. See DSG Chapters 11 and 17, respectively, for standards for pump stations and water service connections. For more information on the history and condition of the water distribution system, see the 2007 Water System Plan. 5.2.3.3 Valves SPU owns about 21,500 valves of various types that support the SPU Water System. SPU installs most valves where needed for ease of operation and system redundancy. District valves are installed on the distribution system to separate pressure zones. Pressure valves regulate flow between pressure zones. Both transmission and water mains have blow-off valves at low points to drain pipelines and air valves at the high points. Air valves either release trapped air from the pipelines when under pressure or allow air into the pipelines while being drained to prevent a vacuum in the pipeline. Some blow-off valves are installed at dead ends for water quality flushing. Inside major facilities, SPU uses blow-off valves for dewatering and flushing operations. Other valves function as bypass, altitude control, or pump control. 5.2.3.4 Infrastructure Elements The following are key components in SPU water system infrastructure: Infrastructure Water Main transmission main feeder main distribution main Description Large diameter (generally >3 ft) pipeline that transfers water from source to feeder mains or storage tanks. There are no service connections on transmission lines, except for purveyors. Smaller diameter pipeline (generally
Chapter 5 Water Infrastructure Infrastructure Storage Facility standpipe reservoir elevated tank Description An aboveground, supported pipe with a height that is generally greater than the diameter. Used where additional height is needed to provide additional pressure without pumping. Tank that is at or below ground level with a diameter or footprint that is typically greater than the height. Reservoirs are usually large in size and storage capacity. SPU is currently covering all open reservoirs or will be removing them from service. Elevated tanks have a supporting structure that elevates the lower operating elevation of water in the tank to a level above ground elevation. Typical layout of SPU water system infrastructure is shown on Figure 5-2. Figure 5-2 Typical Layout of SPU Water System Infrastructure SPU Design Standards and Guidelines 5-7
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2013 Water System Plan Our Water. O
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Seattle Public Utilities 2013 Water
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SPU 2013 Water System Plan 2013 Wat
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SEATTLE PUBLIC UTILITIES 2013 WATER
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2013 Water System Plan Official Yie
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WATER DEMAND FORECAST MODEL STRUCTU
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Household size is calculated for si
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Annual Growth in Average Water Rate
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forecast by subtracting the project
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Components of Actual and Forecast W
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The graph below contrasts the offic
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Forecast Uncertainty What is most c
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the extent to which price-induced c
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Passive Savings: Passive savings co
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The uncertainty model represents a
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Permit Certificate or Claim # Prior
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Permit Certificate or Claim # Name
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Groundwater Elevations at Seattle W
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Forquestions,callKristinaWestbrook,
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WaterReclamationEvaluationChecklist
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9. 24 HOUR PRIMARY CONTACT INFORMAT
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1. SYSTEM ID NO. 77050 Y WATER FACI
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Water System Management and Operato
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Chapter 18 Plan Review Contents Cha
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18.2 GENERAL INFORMATION This secti
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Figure 18-1 Development Permit Boun
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18.3.1.5 Street Use Permit SDOT iss
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3. The Conditional Reviewer enters
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Table 18-2 Information Included in
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5 working days. If an SPU plan revi
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esponsibility in verifying and prot
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RPS sends letter to property owner
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Table 18-4 Plan Review Roles and Re
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Stormwater Code(2009) SMC Chapter 2
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each pay period, SPU Finance sends
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Director’s Rule Title Standard, C
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Exception: To renew and increase ½
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3.16 HYDRANT RESET Set hydrant back
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4. DEVELOPER PROJECTS Note: Charges
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5. PROPERTY SERVICES SPU must charg
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6. LABORATORY ANALYSIS All laborato
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SEATTLE PUBLIC UTILITIES 2012-2014
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Effective January 1, 2014 (a) (b) (
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Policy and Procedure Title Water Av
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1) Location of the property, includ
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J. The easement for an SPU-owned ma
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Seattle Public Utilities System Sto
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actual experience with the 1987 Tol
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pipelines to lower pressure zones t
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Pressure Zone West Seattle 498 West
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