1-02CW373 Supplemental Data

• Case Number: 02CW0373
• Stream Name: South Fork South Platte River
• Watershed: South Platte
• Water Division: 1
• Water District: 23
• County: Park
• Instream Flow App - Doc Type: Supplemental Data

Table of Contents
Introduction 1
Methods 1
Field Data Collection 1
Minimum Flows 6
Water Availability 7
Results 9
Minimum Flow 16
Water Availability 21
Recommendations 23
Minimum Flow 23
Literature Cited: 24
List of Figures
Figure 1. South Fork of the South Platte River study area, Park County Colorado (Map source:
USGS Garo, Colorado 7.5 minute series 1994). 2
Figure 2. Aerial photograph of study area (Photograph date: 22 September 1999). 3
Figure 3. Typical habitat characteristics for the study area. 4
Figure 4. Average daily discharge for 1 April through 30 September 1989 -2000. 8
Figure 5. Analyzed average daily discharge data with best -fit regression line and equation. 8
Figure 6. Habitat types expressed as percent of reach for South Fork of the South Platte River
study area. 12
Figure 7. Percent of total reach area occupied by glide, riffle and pool habitats 13
Figure 8. Percent of total reach area for each individual cover type. 13
Figure 9. Total area (ft2) of each individual cover type for the mapped reach. 14
Figure 10. Percent of reach composed of each type of bank stability. 14
Figure 11. Percent of reach composed of each type of bank rock content. 15
Figure 12. Streambed profiles for transects 1, 3, and 5. 17
Figure 13. Streambed profiles and simulated water surface elevations for riffle transects 2 and 4.
18
Figure 14. Stage - discharge relationship for Riffle Transect 4. 19
Figure 15. Plot of observed discharge (cfs) points by Julian day. 22
Figure 16. Observed and estimated daily discharge (cfs) compared to the winter and summer
minimum flows. 22
List of Tables
Table 1. Flow parameters used to determine minimum flow requirements using the R2CROSS
Method (after Nehring 1979). 7
Table 2. Habitat mapping results for South Fork of the South Platte River study area. 10
Table 3. Hydraulic parameters for riffle transect (T2) 20
Table 4. Hydraulic parameters for riffle transect (T4) 21
Minimum Flow Study, South Fork of the South Platte River —Final Report Page i
February 19, 2001