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23 Memorandum to Rod Kuharich December 21, 2000 upgrade some of the existing DCPs, It appears that as meiny as half of the DCPs may be able to be upgraded by the addition of the new radios, The approximate cost 10, upgrade Is $3000, The cost of new DCPs with the . new radios Is $8000, Page 3 RefurbIshment of Existlne Stream Gaaes DWR, in responding to the needs of CWCS, COEM, LEM ~nd NWS, requests $50,000 for refurbishing existing stream gages. Approximately half of Colorado's satelllte-lIl!lked gaging stations are located In the rivers and streams of the state, The others are located In reservoirs, pitches, and canals, The electronic equipment Is altached to mechanical equipment in and along the stream' channel, and electronically relays the data sensed by the mechanical measuring devices, If the mechanical equipment is not properly maintained and periodically refurbished, the quality of the data diminishes, The DWR nas previously received $35,000 annually since 1994 for refurbishment of stream gages, A total of $165,175 was obtained for controlled maintenance between 1977 and 1993, Many of the stream gages remain In disrepair, Flood Hardenlna of Existina Stream Gaees , DWR requests $100,000 for flood hardening stream gages[ The DWR operates at least eighty stream gages that have been Identified by our Division Engineers as usel,ulln flood warning and notification, mostly on the South Plalte, Arkansas and Rio Grande rivers and their trlQutaries, The cost to modify many of these gages to withstand 200-year flood events will vary considerably, Eabh site should be evaluated for required modifications to flood harden the gage, The costs will vary from as little as $25,000 to several hundred thousand per site, This part of the gaging station program Involves flood hardening those stream gages used for notification In the event of floods or dam breaks, Flood hardening, by definlti,on, allows for stream flow data to continue to be transmitted up to the 200-year flood event level. Flood hardening prevents the need to develop a plan to remove all equipment from stream gages prior to their destruction by floods. While this equipment removal saves equipment costs, this does not allow for data transm,lsslon during flood events to emergency managers and the public, ' . Flood hardening Involves moving or modifying the existing ,stream gages so that they can continue to operate during flood events up to the 200,year level, Some times i1 may be necessary to add a second gage at the site on higher ground so that the low flows needed for accurate water administration can be measured and the high flows of floids also can be measured, Another form of flood hardening Involves rebuilding the stream channel so that accurate data will continue to be available during th/3 flood, Often the stream channel becomes scoured or modified to the point that existing relationships between stage and discharge are no longer valid at high flow. Even If the data continues to be available, It is of little or no: value In determining the flow of the river. There are modifications to the stream control available which have b~en shown to withstand the force of the floodwaters and thus maintain the accuracy of the data being reported lit the location, These structures cost approximately $1,000 per foot of channel width, Urban Drainage has or Is constructing channel controis at the South Platte River at Denver and the South Platte River near Henderson for this cost. Also, the State of Wyoming has constructed new controls at 6 sites on the North Platte River usIng sheet piling at a similar price. In addition, there ara Inflatable control structures that may be cost affective, JGBlgla:e:wordldamaafelyIDWR Satellite Monitoring Memo 12.00,doe .