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CONP 9 7y ;;> if-=, :~n '7 S 0 F1D':~'''I':~~'':.)~1Dnite~ltates Department of the Inte j OfficIal File Cow GR'. . p~.>. Ofi=',. GEOLOGICAL SURVEY IJO. S EP 15 1993 Rm.VOA'lE Water Resources Division P.O. Box 2027 Grand Junction, Colorado 81502 I" " ~. ~/:J- . :iA?:.:l:: .J Memorandwn \. r, Sept\mber 14; 1993 ~ Date: To: Mr. Ronald J. Schuster, Acting Projects Manager Uni Bureau of Reclamation, Grand Junction Projects From: Joseph R. Sullivan, Hydrologic Technician Subject: Stream-flow records, Gunnison River below Gunnison Tunnel Enclosed is the informacion you requested in your memorandum dated September 8, 1993. A brief description of the operating conditions of the subject stream- gaging station follows. Please contact me if you require additional information on this site. The Gunnison River below Gunnison Tunnel gage was converted from a manometer to a stilling well on July 28, 1993. The digital recorder was removed and' a Sutron 8200 data collection platform with a GOES radio (owned by the Colorado Division of Water Resources) and a Stevens A-35 strip chart are the recording devices. During the winter, the cantilevered chain-weight gage heaves causing the outside gage readings to be in error. However, when levels have been run over the last few years the inside gage readings have been found to be correct. With the recording devices now being driven by a float within the stilling well, the gage-height record is referenced to tape-down readings in the well instead of the outside gage. Satellite data was erratic the begining of the year because the GOES 6 satellite was low on fuel and wobbling causing frequent missed transmissions, The missed transmissions usually occured during the late afternoon and evening. Data is now being received by the GOES 2 satellite and missed transmissions are rare. -, - .] . '; J,;. I) V 0/7 V~ ~...:J ~,f>\ ~~~ 7