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BOARD00158 (2)
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BOARD00158 (2)
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Last modified
8/16/2009 2:46:02 PM
Creation date
5/1/2007 10:24:14 AM
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Board Meetings
Board Meeting Date
3/13/2007
Description
Flood Section - 2007 Long-Term Flood and Water Availability Outlook - Presentation by John Henz
Board Meetings - Doc Type
Memo
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<br />.' <br /> <br />- 3 - <br /> <br />. <br /> <br />In general, the snowmelt flood updates will be provided to assist in the preparation of potential snowmelt flooding <br />in Colorado, and the staff gladly welcomes all suggestions and feedback at any time. <br /> <br />Online Services <br />Staff will post (or continue to post for certain types of data) online information and services on the CWCB website. <br />A number of documents, maps, data and other information are provided to the public such as: <br /> <br />. Regular Flood Outlook emails issued by the CWCB <br />. Archive of SNODAS/SNOTEL GIS maps in .pdf format <br />. Electronic copy of Spring Weather Outlook as presented to the CWCB at the March meeting <br />. Electronic copy ofCWCB's Spring Flood Hazard News Release <br />. Minutes and presentations from the Flood Task Force Meetings <br />. Links to USGS streamgage information <br />. Links to a number of weather related websites, including the National Weather Service offices, <br />regional radar, NOAA weather radio, and The Weather Channel website <br />. County Emergency Contacts at the Colorado Division of Emergency Management website <br />. NOAA's National Flood Outlook <br />. Link to FEMA's Spring Flood Center <br />. Link to Urban Drainage and Flood Control Center's ALERT website (flood warning system for the <br />Denver metropolitan area) <br />. Information on the use of sandbags to protect property <br />. Link to FEMA's Map Service Center to obtain Flood Insurance Rate Maps online <br />. Information regarding the Flood Mitigation Assistance (FMA) Program <br /> <br />. <br /> <br />Snowpack Monitorini! <br />Beginning on February 1,2007 staff has been monitoring snowpack in Colorado watersheds, as measured by inches <br />of Snow-Water Equivalent (SWE) and % of 30-year average of SWE. SWE is measured daily at the NRCS <br />automated SNOTEL sites, and reports are posted on the Internet. The inches of SWE measured at the SNOTELs <br />represent the total amount of water equivalent stored as snow in the portion of a particular watershed represented <br />geographically by each SNOTEL. The % of average SWE represents the amount of water stored as snow in the <br />portion of a watershed represented by each SNOTEL as compared to a 30-year average amount for that watershed. <br />Both the absolute number (inches of SWE) and the relative number (% of average) are needed to paint a <br />comprehensive picture of conditions in the state's watersheds. <br /> <br />Staff will monitor these numbers on a frequency ranging from every day to once a week, depending on snow and <br />weather conditions in the mountains and imminence of expected runoff. The SWE numbers will be assembled into <br />tables and incorporated into the Weekly Snowmelt Flood Updates. In addition, maps will be created at necessary <br />intervals which show graphically the snowpack situation throughout the state. The map created on February 1 sl did <br />not indicate any severe threat areas as of that time. Additional maps will be created as needed. <br /> <br />Staffhas also been working on a link between snowpack information and streamflow information. A GIS project <br />took place in 2005 by CWCB interns to delineate subbasins within the major river basins. The eventual goal is to <br />allow users to see quickly where the highest snowpack is, where the stream systems and communities are <br />downstream of that snowpack, and where the stream gages are located that would allow measurement of that <br />melted snow once it becomes runoff. <br /> <br />. <br /> <br />Staffwill continue to monitor snowpack and streamflow conditions on a regular basis through the rest of the flood <br />season. Updated and revised data will be provided to the Board at future meetings as needed. <br /> <br />Flood Protection. Water Project Planning and Finance' Stream and Lake Protection <br />Water Supply Protection. Conservation Planning <br />
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