2008-03-25_PWETC_AgendaPacket - Laserfiche WebLink

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City of Roseville March, 2008 they will be turned over to the MCES as a "demand" charge and the MCES will use the funds for regional system improvements. At the end of the five year I!I Surcharge Program, the MCES will continue the annual charge on communities for peak flows in excess of the allowable flow, but the funds will go directly to the MCES budget and will not be available to the Community for Ill reduction efforts. The goal is to make enough III improvements between 2007 and 2011 to eliminate the excess peak flow and therefore eliminate the Ill surcharge entirely. II. Background According to the Metropolitan Council Water Resource Management Policy Plan, the Ciry of Roseville is expected to grow in population from 33,690 in 2000 to 38,300 in 2030 and grow in households from 14,600 in 2000 to 16,500 in 2030. This growth will increase the demands on the local and regional infrastructure including the wastewater collection and treatment systems that are the subject of this report. Wastewater flow from the City of Roseville is calculated based on data from eight (8) MCES meters (M046, M049, M050, M051, M052, M054, M055, and M055A) located as shown on Figure 1, The existing Roseville sanitary sewer system includes approximately 745,900 feet (141,3 miles) of 8 inch to 42 inch diameter sewer pipe divided into eight (8) districts or "meter sheds" for analysis as shown Figure 1 and detailed in the following table, The Table also includes information of the extensive MCES Interceptor sewers that extend through the City of Roseville. Table 1 - Sanita Sewer Invento Meter Number Range of pipe diameters (in) Length Comments A 8"- 30" 50,300 B 8"- 24" 46,800 C 8"- 18" 31,200 D 8"- 36" 130,100 E 8"- 18" 57,900 F 8"- 18" 40,700 G 8"-24" 96,800 H 8"-21" 28,100 Un-metered 8"- 42" 264,000 Sub-Total 745,900 MCES 8"- 54" 63,500 Total 809,400 The total wastewater from the City of Roseville is estimated by subtracting incoming flow from seven (7) meters from the outgoing flow measured atone meter. The annual average daily flow for each of the past three years and the current MCES 3-year average and allowable peak flows are as follows: Table ~ -Annual Avera a Dail Flow and Allowabl e Peak Flow in m d Meter Formula 2004 2005 2006 MCES Allowable 3 Yr Peak Av M046-(M049+M050+M051+M052+M054+M055+M055A) 4.033 3.890 3.807 4.01 10.03 It is notable that the annual average daily flow has declined slightly each year during this monitoring period. This reduction in average flow directly affects the "allowable flow" calculated by the MCES, The MCES annually recalculates a three year average flow based on the records from the most recent 3 year period, This calculated average determines the peak to average (PIA) ratio which in turn is used to calculate the "allowable" peak flow. For 2008, the 3-year average flow for the City of Roseville is 4.01 mgd; the P/A is 2.5 Page 4 of 12