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<br />Memorandum to Rod Kuharich
<br />September 4, 2001
<br />
<br />Page 3
<br />
<br />Refurbishment of Existina Stream Gaaes
<br />
<br />DWR, in responding to the needs of CWCS, COEM, LEM and NWS, requests $56,000 for refurbishing
<br />existing stream gages, Approximately half of Colorado's satellite-linked gaging stations are located in the
<br />rivers and streams of the state. The others are located in reservoirs, ditches, and canals. The electronic
<br />equipment is attached to mechanical equipment in and along the stream channel, and electronically relays
<br />the data sensed by the mechanical measuring devices. If the mechanical equipment is not properly
<br />maintained and periodically refurbished, the' quality of the data diminishes. The DWR has previously
<br />received $35,000 annually since 1994 for refurbishment of stream gages. A total of $165,175 was
<br />obtained for controlled maintenance between 1977 and 1993,
<br />
<br />In FY03 the $56,000 is to be used to repair and refurbish the following sites:
<br />
<br />Kerber Creek near Villa Grove, CO
<br />North Crestone nearCrestone, CO
<br />Crooked Arroyo near Swink, CO
<br />Horse Creek at Highway 194 near Las Animas, CO
<br />South Platte River at Fort Morgan, CO
<br />San Isabell Creek near Crestone, CO
<br />Cherry Creek near Crestone, CO
<br />Cotton Creek near Mineral Hot Springs, CO
<br />
<br />$11,000
<br />$ 6,000
<br />$ 8,000
<br />$ 8,000
<br />$11,000
<br />$ 4.000
<br />$ 4,000
<br />$ 4,000
<br />
<br />Flood Hardeninq of Exlstina Stream Gaaes
<br />
<br />DWR and cwes, jointly, request $150,000 for flood hardening stream gages. A committee of
<br />representatives of DWR, CWCS and the USGS has identified forty sites where flood-hardening projects
<br />would be useful in flood warning and notification, The cost to modify many of these gages to withstand
<br />flood events will vary considerably. Each site is being evaluated for required modifications to flood harden
<br />the gage, The costs will vary from as little as $25,000 to several hundred thousand per site, Individual
<br />work plans for the forty sites are being developed.
<br />
<br />This part of the gaging station program involves flood hardening those stream gages used for notification in
<br />the event of floods or dam breaks. Flood hardening, by definition, allows for stream flow data to continue
<br />to be transmitted during a flood event. Flood hardening prevents the need to develop a plan to remove all
<br />equipment from stream gages prior to their destruction by floods, While this equipment removal saves
<br />equipment costs, this does not allow for data transmission during flood events to emergency managers
<br />and the public,
<br />
<br />Flood hardening involves moving or modifying the existing stream gages so that they can continue to
<br />operate during flood events. Some times it may be necessary to add a second gage at the site on higher -
<br />ground so that the low flows needed for accurate water administration can be measured and the high flows
<br />of floods also can be measured. Another form of flood hardening involves rebuilding the stream channel
<br />so that accurate data will continue to be available during the flood, Often the stream channel becomes
<br />scoured or modified to the point that existing relationships between stage and discharge are no longer
<br />valid at high flow. Even if the data continues to be available, it is of little or no value in determining the flow
<br />of the river,
<br />
<br />JGB/gla:c:word/JacI<lMemo to Rod Kuharich 8-01 ,doc
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