MIG 3 Project Operations Rule Curve Change Analysis Study Plan Review

1
MIG 3 Project Operations Rule Curve Change
AnalysisStudy Plan Review

• April 1, 2008

2
MIG 3 Agenda

• Introductions
• Summary of Comments
• Summary of Revisions to the MIG 3 Draft Study
  Plans
• Next steps in FERC process

3
MIG 3 Study Plan Commenters

• USFWS
• ADCNR
• ARA
• LM HOBO
• Will Denton

4
Study Goals

• Determine the feasibility of revising the Martin
  rule curve by modeling changes involving an
  increase in winter pool elevation up to 5 feet
  (485 MD).
• Determine potential flood impacts associated with
  higher winter rule curve levels and also address
  the duration of the summer pool (e.g., extending
  the summer pool into October or November).

5
Study Methodology

• Develop the Flood Frequency Analysis (FFA) to
  determine the statistical frequency of historical
  flood event.
• Develop a 100yr design flood based off the FFA
  considering peak timing and volume of the event.
• Develop the HEC-RAS model for Martin and for
  downstream.
• Develop the Project Routing model to route the
  flood thru the dam determining the appropriate
  outflow and elevation.
• Route the 100 yr design flood for the current
  flood control and rule curve as well as for any
  proposed flood control and rule curve to be
  limited to a reasonable number of runs.
• Working with stakeholders, develop a short list
  of rule curve elevation changes and extensions of
  time at summer pool in the shoulder seasons for
  analysis by the models.
• Evaluate the results and identify any impacts to
  downstream resources.
• Flow duration analysis for low flow scenarios.
• HydroBudget analysis to determine the cost
  associated with increased winter pool
  elevations. 
• Provide results to stakeholders for review.

6
Revisions to Study Methodology

• Work with stakeholders to develop a short list
  of rule curve elevation changes and extending the
  summer pool elevation for running through the
  models.

7
Next Steps in the Process

• Summary and FERC Process

8
Summary

• Draft Study Plans filed with PAD NOI - June
  2008
• Comments due on PAD (including Study Plans) -
  September 2008
• Final Study Plans filed with FERC- November 2008
• Stakeholders have the opportunity to file their
  recommended changes to APCs Final study plans -
  December 08 February 09

9
FERC Study Plan Process
APC files NOI PAD (June 2008)
FERC Issues SD1
FERC holds Scoping Meetings
Comments on PAD, SD1 Study Requests
60
30
30
Days
45
APC Files Proposed Study Plan (November 2008)
Comments on Study Plan
FERC Study Plan Approval (April 2009)
Study Dispute Resolution (if necessary)
60
90
90