SPDSS_Task5_KeyMuniUser_Longmont

• Title: SPDSS Task 5 - Key Structure, City of Longmont
• Description: The City of Longmont has been identified as a key municipal user for the South Platte Decision Support System ‎(SPDSS)‎ consumptive use and surface water modeling efforts. The purpose of this Task 5 memorandum is to document physical, legal, and operational aspects of those key structures identified.
• Decision Support - Doc Type: Task Memorandum
• Date: 3/2/2005
• DSS Category: Surface Water
• DSS: South Platte
• Basin: South Platte
• Contract/PO #: C153954
• Grant Type: Non-Reimbursable
• Bill Number: SB01-157, HB02-1152, SB03-110, HB04-1221, SB05-084, HB06-1313, SB07-122
• Prepared By: Leonard Rice Engineering

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Union Reservoir End-Of-Month Contents
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Return Flow Location
The City's WWTP is located on the north side of the St. Vrain Creek in the Northeast'/4 of
Section 11, Township 2 North, Range 69 West of the 6th Principal Meridian. The plant has an
operating capacity of 17 mgd and currently discharges an average of about 8.5 mgd to the St.
Vrain Creek a few hundred yards below the confluence with Left Hand Creek, as shown in
Figure 1. The WWTP has been located at this site since the 1950s.
The City does not have a reuse plant on-line. The City recently constructed river pumps on the
St. Vrain Creek above the WWTP effluent discharge. These pumps will be used to convey water
to Union Reservoir via the Oligarchy Ditch with immediate replacements made to the river from
effluent releases or other supplies from upstream storage releases and/or changed ditch credits.
The total operating capacity of the river pumps is 20 cfs and the City plans to start operating this
river diversion and replacement to the river in fall 2005.
WATER RIGHTS
In addition to its direct flow Pipeline and storage water rights, the City has acquired share
ownership in various ditch companies and reservoir storage as a consequence of the raw water
dedication policy that has been in place for the last 40 years and other purchases of raw water
supplies. The City's ownership in many of the direct flow rights associated with these ditches
were changed to municipal uses in water court in a series of cases in the early-1980s (the "early
City of Longmont Operating Memorandum.doc Page 10 of 21 March 2, 2005
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