Basic Standards Workgroup 12/16/2015 WQCD - Temperature Issues - - PowerPoint PPT Presentation

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Basic Standards Workgroup 12/16/2015 WQCD - Temperature Issues - - PowerPoint PPT Presentation

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Basic Standards Workgroup 12/16/2015 WQCD - Temperature Issues Water Temperature and Elevation At higher elevation Lower max temp Longer time below temperature thresholds Elevation central to transition zone problem Elevation central to

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SLIDE 1

Basic Standards Workgroup 12/16/2015

WQCD - Temperature Issues

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Water Temperature and Elevation

5 10 15 20 25 Dec-11 Apr-12 Jul-12 Oct-12 Jan-13 May-13 Aug-13 Nov-13 Mar-14 MWAT, oC State Line (4325) Glenwood (5760) abv Shadow Mt (8386)

At higher elevation

Lower max temp Longer time below temperature thresholds

Elevation central to transition zone problem Elevation central to shoulder season problem

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Shoulder Seasons

  • Elevational constraint on the Pattern
  • Physiological Requirements of the fish
  • Regulatory Framework

– Recognize natural gradient – Flexibility in the face of uncertainty

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Winter Start Date

y = -0.0099x + 355.6 R² = 0.8497 18-Jul 7-Aug 27-Aug 16-Sep 6-Oct 26-Oct 15-Nov 5-Dec 3000 5000 7000 9000 11000 Median Start Date MWAT<9 Elevation, ft

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SLIDE 5

Winter Duration

y = 0.0326x - 11.535 R² = 0.8733 50 100 150 200 250 300 350 400 3000 5000 7000 9000 11000 Median Duration MWAT<9 Elevation, ft

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SLIDE 6

2 4 6 8 10 12 14 16 18 1-Jan 20-Feb 10-Apr 30-May 19-Jul 7-Sep 27-Oct 16-Dec

Highest WAT °C

Ordinal Day

WAT-Trapper Creek

2008 2009 2010 2011 2012 2013 CS-I MWAT steps

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SLIDE 7

Shoulder Season Questions

  • What are the pros and cons of narrative
  • ption?
  • Are there options to include an elevational

component?

  • Could alternative averaging periods be used?
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SLIDE 8

2 4 6 8 10 12 14 16 18 8/30 9/14 9/29 10/14 10/29

Bear Creek at O'Fallon Park

Sept -Oct 2008 WAT ( °C)

WAT MWAT Av

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Transition Zones

  • Elevational Constraints
  • Nexus with Physiological Requirement
  • How can we recognize the natural gradient in

the regulatory framework

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Max MWAT All Sites

11000 10000 9000 8000 7000 6000 5000 4000 3000 35 30 25 20 15 10

Elevation_Pt Max_WAT_Pt

S 2.08009 R-Sq 77.8% R-Sq(adj) 77.7% Regression 95% CI 95% PI

Fitted Line Plot

Max_WAT_Pt = 35.92 - 0.002409 Elevation_Pt

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SLIDE 11

Regulatory Framework / Policy Issues

  • Implementation options?

– Apply broadly, statewide – Limit application (by stream order, other?) – Add equation to Reg #31, but apply it on a segment-by-segment basis

  • Other Policy questions