SPDSS_Task5_KeyStructure_BobCreekDitch

• Title: SPDSS Task 5 - Key Structure, Bob Creek Ditch
• Description: The Bob Creek Ditch has been identified as a key structure 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: 7/15/2005
• 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

HydroBase Data: Diversions through Bob Creek Ditch have been reported as continuously
monitored streamflow records and administrative records by Colorado DWR.
Continuously monitored streamflow records for Station BOBGLNCO are available from
1940 through water year 2001. Administrative records for Structure 4800573 are
available from 1999 through water year 2001. Administrative records are not available
for Structure 0304602. Continuously monitored streamflow records and administrative
records are available on a daily and monthly basis through Colorado DWR HydroBase.
In addition, George Varra, Water Commissioner for Division 3, keeps monthly diversion
records for Bob Creek Ditch in a spreadsheet with other transbasin diversion records.
Available diversion data for Bob Creek Ditch was reviewed and compared to identify the
best available data source (shown in Figure 2). The preferred set of data identified for
Bob Creek Ditch was the continuously monitored streamflow records for Station
BOBGLNCO. When compared to the other available information sources, data at Station
BOBGLNCO displayed the following characteristics:
• The longest period of record,
• The most complete set of data prior to and throughout the period of study,
• Corresponding monthly and daily diversion data available, and
• Continues to be operated as a recording device through present.
Figure 2
Bob Creek Ditch
Historic Diversions -Calendar Year 1950 - 2002
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Ditch Not In Operation ~
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Year
Annual Diversions for the 1998 to 2002 period of operation:
Average (1998-2002) = 31.2 acre-feet
Maximum (1999) = 56.9 acre-feet
Minimum (2002) = 3.0 acre-feet.
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