Italian Creek ISF Proposal with Attachments 10-27-21

• Case Number: 22/4/A-003
• Stream Name: Italian Creek
• Watershed: East Taylor
• Water Division: 4
• Water District: 59
• County: Gunnison
• Year: 2022
• Instream Flow App - Doc Type: Supplemental Data

9/23/2020 StreamStats
Parameter Code Parameter Name Value Units Min Limit Max Limit
DRNAREA Drainage Area 16.8 square miles 1 1060
PRECIP Mean Annual Precipitation 28.4 inches 18 47
ELEV Mean Basin Elevation 11108 feet 8600 12000
Low-Flow Statistics Flow Report[Mountain Region Min Flow]
PII: Prediction Interval-Lower, Plu: Prediction Interval-Upper, SEp: Standard Error of Prediction, SE:
Standard Error (other -- see report)
Statistic Value Unit SEp
7 Day 2 Year Low Flow 2.1 ft"3/s 89
7 Day 10 Year Low Flow 1 .29 ft"3/s 153
7 Day 50 Year Low Flow 0.953 ft"3/s 126
Low-F/ow Statistics Citations
Capesius, J.P., and Stephens, V. C.,2009, Regional Regression Equations for Estimation of
Natural Streamflow Statistics in Colorado: U. S. Geological Survey Scientific Investigations
Report 2009-5136, 32 p.
(http://pubs.usgs.gov/sir/2009/5136/http://pubs.usgs.gov/sir/2009/5136/)
Flow-Duration Statistics Parameters[Mountain Region Flaw Duration]
Parameter Code Parameter Name Value Units Min Limit Max Limit
DRNAREA Drainage Area 16.8 square miles 1 1060
PRECIP Mean Annual Precipitation 28.4 inches 18 47
Flow-Duration Statistics Flow Report[Mountain Region Flow Duration]
PII: Prediction Interval-Lower, Plu: Prediction Interval-Upper, SEp: Standard Error of Prediction, SE:
Standard Error (other -- see report)
Statistic Value Unit SEp
10 Percent Duration 47.5 ft^3/s 45
25 Percent Duration 12.8 ft^3/s 55
50 Percent Duration 4.75 ft^3/s 55
75 Percent Duration 2.64 ft^3/s 64
90 Percent Duration 1 .58 ft^3/s 85
https://streamstats.usgs.gov/ss/ 5/7