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
Statistic Value Unit SEp
50 Year Peak Flood 367 f113/s 39
100 Year Peak Flood 409 ft^3/s 36
200 Year Peak Flood 444 ft^3/s 36
500 Year Peak Flood 510 ft^3/s 33
Peak-Flow 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/)
Flood-Volume Statistics Parameters[Mountain Region Max Flow]
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
Flood-Volume Statistics Flow Report[Mountain Region Max 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 Maximum 109 ft^3/s 46
7 Day 10 Year Maximum 177 ft^3/s 35
7 Day 50 Year Maximum 242 ft^3/s 31
Flood-Volume 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/)
Low-Flow Statistics Parameters[Mountain Region Min Flow]
Parameter Code Parameter Name Value Units Min Limit Max Limit
https://streamstats.usgs.gov/ss/ 4/7