SPDSS_Task34-3_Phase 3_StreambedConductanceTesting

• Title: SPDSS Task 34.3 - Streambed Conductance Testing - Phase 3
• Description: The objective of this Task 34 is to collect data needed to quantify the groundwater flux across the streambed in the South Platte River and significant tributaries.
• Decision Support - Doc Type: Task Memorandum
• Date: 6/28/2007
• DSS Category: Groundwater
• DSS: South Platte
• Basin: South Platte
• Contract/PO #: C153953
• Grant Type: Non-Reimbursable
• Bill Number: SB01-157, HB02-1152, SB03-110, HB04-1221, SB05-084, HB06-1313, SB07-122
• Prepared By: CDM

Tine streambed K and thickness of streambed sediments are evaluated wider this task.
In addition, data relating to fine stream geomorphology and stream channel geometry
were collected. All of these data will be used as components iIn the Streannflow-
Routing Package wlnicln is used in the development of the conceptual model wider
Task 48.
The objective of this task was achieved by collecting data on streambed sediment
hydraulic properties and channel cross section geometry. Tlnis Technical
Memorandum (TM) presents fine field data collected under Task 34.
Approach
The following table summarizes the sections contained in this TM.
Section Descri tion
1.0 Testin Site Selection and Namin
2.0 Field Data Collection Procedures
2.1 Channel Cross Section Profil>ln~
2.2 Streambed Sediment Sam lines
2.3 Streambed Vertical H draulic Gradient Testin
2.4 Streambed H draulic Conductivit Testing and Anal sis
2.5 Surve inQ
3.0 Results
3.1 Stream Channel Cross Section Surve Results
3.2 Streambed Sediment Sam ling Results
3.3 Streambed H draulic Conductivit Testing Results
3.4 Streambed Vertical H draulic Gradient Results
3.5 Site Surve Results
4.0 Summary and Conclusions
5.0 Recommendations
6.0 References
Appendices
A Cross Sections of the Streambed at Sam ling Sites
B Streambed Sample Litlnolo 'c Descriptions
C Geotechnical Grails-Size Analytical Summar and Distribution Curves
D Sampling Site Surve Results
1.0 Test Site Selection and Naming
A total of 30 sites were used for field testing and data collection. A relatively even
geographic distribution of test sites along tine mainstem of the South Platte River was
selected. Test site selection on tributaries was heavily influenced by tine presence of
flow>ing streams and receipt of landowner permission to access prospective sites.
Figure 2 shows the locations of the testnng sites within the study.
Fnlal T~zsl: 3~TM 06-28-07.doc