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Table 3-4 Average Strearnflow (af/yr)1
<br />
<br />
<br />Streamflow Monitorin Site and Number Steady-state
<br />Calibration Period
<br />(1991-1994) Transient
<br />Calibration Period
<br />(1999 - 2005) Validation
<br />Period
<br />(1950 - 2006)
<br />Plum Creek near Louviers? (6709500) 13,00 22,60 23,910
<br />South Platte River below Chatfield (6708000) 49,630 73,900 120,260
<br />South Platte River at Denver (6714000) 158,660 199,230 232,550
<br />South Platte River at Henderson (6720500) 262,260 327,460 336,880
<br />South Platte River at Fort Lupton (6721000) 286,890 33.1,700 354,260
<br />South Platte River near Kerse (6754000) 553,490 586,810 720,120
<br />South Platte River near Weldona (6758500) 358,610 395,560 504,230
<br />South Platte River at Balzac~ (6759910) 289,060 307,170 415,840
<br />South Platte River at Julesbur r~ (6764000) 302,830 257,910 418,740
<br />Cache la Poudre River at Canyon Mouth near
<br />Fort Collins (6752000)
<br />191,980
<br />183,290
<br />226,030
<br />Cache la Poudre River near Greele ~ (6752500) 82,590 91,280 115,190
<br />Cherr Creek near Franktown~ (6712000) 4,350 6,520 6,520
<br />Cherr Creek at Denver (6713500) 16,660 27,530 17,390
<br />i Values in acre-feet per year, rounded to nearest 10 units
<br />~ Pepresents stream flow into the alluvi~~l model domain
<br />;Pepresents stream tlow out of the alluvial model domain
<br />~ The South Plate near Balzac gage has been combined with the South Platte at Cooper Bridge due to the gage being
<br />moved during the full simulation period
<br />3.4 Stream Gain/Loss Targets
<br />As discussed in Section 2.0, streaniflow and stream gain/loss will serve as a calibration target
<br />dur>11g the automated parameter estimation process. A groundwater flow model is considered
<br />much more reliable when it is calibrated to more t11an one type of target, suc11 as flux (in t11is
<br />case streaniflow and stream gain/loss), in addition to head (Anderson & Woessner 1992).
<br />Observed streaniflow (from gage records) and stream gain/loss reflect monthly diversions,
<br />tributary inflows, municipal discharges, and surface water gain/loss processes in the reach
<br />upstream of the gage. These flows can change significantly from month to month in the South
<br />Platte River basin and therefore are an important target to include u1 the model calibration.
<br />Average gain/loss targets for eac11 study reach are shown >11 Table 3-5 below. These values are
<br />from the Task 46 Stream Gain/ Loss Estimates TM (CDM 2008). T11e negative values indicate
<br />that flow is from groundwater to the receiving streams. As with the stream flow data presented
<br />>11 the previous section, the transient calibration and validation periods have a monthly set of
<br />individual gain/loss values that will serve as the targets for these calibration periods.
<br />P~ SPDSS T~8 2 Final TM 10-08-08.doc 11
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