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Statewide Water Supply Initiative - Update

The ongoing SWSI update will serve two primary purposes:

  • Provide a consistent statewide framework for examining future water supply and demand under different scenarios 
  • Provide tools and data for Basin Roundtables to use in updating their Basin Implementation Plans (BIPs) and developing detailed local solutions to identified gaps.

Since this is the first time that SWSI is completed in the context of Colorado’s Water Plan (CWP) and the Basin Implementation Plans (BIP), this SWSI update will be different from previous versions.  SWSI 2010 was a relatively straightforward update of the original SWSI 2004 analysis, and did not focus on methodology refinement.  In addition to complementing CWP and the BIPS, this SWSI update will also include a number of new approaches and additions, such as quantifying a scenario planning approach, providing a more detailed and scientifically rigorous hydrologic modeling approach, and addressing agricultural, environmental, and recreational gaps.  As a result, the first step in this SWSI update involves reviewing and refining the methodologies.

The proposed methodologies were developed by CWCB staff and technical consultants with a broad range of technical expertise and prior SWSI experience.  The methodology development process included review of prior SWSI methodologies, initial drafting of new or enhanced methodologies, and collaborative workshops involving CWCB and consultant staff to further develop and refine proposed methodologies.  The review of prior methodologies, recommended methodology revisions, and proposed new methodologies for each area of study are documented in the draft technical memoranda (TMs) below. 

Draft Technical Memorandum

Municipal and Self-Supplied Industrial 


Scenario Planning

Environmental and Recreation


Water Supply

Project Management Plan for the Statewide Water Supply Initiative Update

The Project Management Plan (PMP) is a document that provides a roadmap for conducting the SWSI update and developing products and deliverables. The roadmap includes documentation and reporting guidance, communication tools, team coordination information, quality guidance, and descriptions of roles and responsibilities so that the team can be effective and efficient.

List of Technical Advisory Group (TAG) Participants
The CWCB is using a Technical Advisory Group (TAG) process to get stakeholder feedback and ensure that the new methodologies are scientifically sound, effective, and appropriate. TAG participants are encouraged to compile feedback from other roundtable members and local constituents. The TAG review will focus on technical issues, including key concepts and assumptions, data sources, and fatal flaws. Click here to view a list of participants.

 SWSI Fact Sheets

 Overview Fact Sheet  SWSI Overview
 Population Projections  Population Projection Methodology
 Water Supply  Water Supply Methodology
 Finance  Finance Methodology
 Environment & Recreation  Environmental and
 Recreation Methodology
 Scenario Planning  Scenario Planning and
 Gap Analysis
 Municipal  Municipal and
 Self-Supplied Industrial
 Demand Methodology
 Agriculture  Agricultural Diversion Demand