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Last modified
9/26/2011 8:37:06 AM
Creation date
7/9/2008 2:51:47 PM
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Decision Support Systems
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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Table 1 <br />Ralph Price Reservoir <br />Stage -Area -Capacity Curve <br />Elev. Area Capacity <br />(ft) (Acres) (Ac-Ft) <br />6236 3.1 5.7 <br />6244 11.2 65.7 <br />6252 18.8 184.4 <br />6260 26.8 368.2 <br />6268 34.4 615.0 <br />6276 42.7 922.2 <br />6284 50.3 1294.6 <br />6292 59.7 1734.4 <br />6300 68.2 2246.4 <br />6308 78.3 2832.0 <br />6316 88.4 3498.8 <br />Elev. Area Capacity <br />(ft) (Acres) (Ac-Ft) <br />6324 100.1 4253.2 <br />6332 111.3 5098.4 <br />6340 122.0 6032.8 <br />6348 133.0 7053.1 <br />6356 145.8 8167.3 <br />6364 158.7 9383.6 <br />6372 171.2 10704.2 <br />6380 184.0 12123.4 <br />6388 200.3 13666.5 <br />6396 214.6 15324.3 <br />6400 221.8 16197.2 <br />Source: City of Longmont <br />Notes: Dead storage of 30 ac-ft (elevation 4.3 feet) <br />HydroBase Data <br />The monthly data available in HydroBase over the 1950-2002 period of record pertaining to <br />Ralph Price Reservoir include the following: <br />End-of--month contents <br />• Complete record since reservoir started filling in 1969 (see Figure 3), except for data <br />missing in water years 1971 and 1972, and sporadic months over the period of record. <br />The City provided copies of its available storage content records for these periods. <br />• Maximum end-of--month contents in HydroBase (Figure 3) increase starting in 1989. This <br />was due to a change from using the as-built area-capacity curve to using the correct area- <br />capacity curve provided in Table 1. <br />• Records of alternate point diversions to storage in Ralph Price Reservoir for Longmont's <br />changed water rights are available from the early-1980s for a few structures and from the <br />mid-1990s forward for most of the changed water rights. <br />City of Longmont Operating Memorandum.doc Page 7 of 21 March 2, 2005 <br />
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