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HomeMy WebLinkAboutAPA3401SOSITNA HYDROELECTRIC PROJECT TECHNICAL MEMORANDUM 1985 SOSITRA RIVER FREEZE-UP Report by R&M Con s ultants, Inc. Under Contract to Harza-Eba s co Susitna Joint Ventur e Prepared for Alaska Power Authority Final Report June 1986 Dc.cua t No. ,.01 Sueit,.. F' 'e No. 4.2.2.1 NOTICB ARY QUISTIORS OR COMMBRTS OORCBRNIRG TBIS RBPORT SBOOLD BB DIRBCI'BD TO '1'IIB ALASKA POWU AOTIIORI'l'Y SOSITBA PROJBCT OPPICI 13/1 8 1 Section 1 . 0 2 .0 3 .0 4.0 5 .0 T ABLE OF CONTENTS Ti tle Pa ge Li s t of Tables ii INTRODUCTION SUMMARY 2 CHRONOLOGY OF 1985 SUSITNA RIVE R FREEZEUP 3 METEOROLOGY A N D DATA COLLECTION 9 REFERENCES 21 APPENDIX A River Ice Observations and Weather Data From Gold Creek . APPENDIX B Monthly Meteorological Summaries From Weather Stat ions at Watana and Talkeetna. 13/18 2 Number 3.1 3.2 4.1 4.2 4.3 4.4 LIST OF TABLES Title 1985 Susitna River Freeze -up, Leading Edge Progressio Summary Water Surface Elevations, 1985 Freeze-up Talkeetna Weather Station Air Temperature and Freezing -Degree Days Summary September, 1985 Talkeetna Weather Station Air Temperature and Freezing -Degree Days Summary October, 1985 Talkeetna Weather Station Air Temperature and Freezing -Degree Days Summary November, 1985 Watana Weather Station Air Temperature and Freezing -Degree Days Summary September, 1985 ii Page 6 7 10 11 12 13 13/18 3 LIST OF TABLES (Continued) Number Title Page 4.5 Watana Weather Statio n Air Temperature and 14 Freezing -Degree Days Summary Octo ber, 1985 4.6 Watana Weather Station Air Tempera t ure and 15 Freezing -De ""r ee Days Summary November, 1985 4.7 Watana Weather Station Air Temperature and 16 Freezing -De"'ree Days Summary December, 1985 4.8 Wa t ana Streamgage Site, Air Temperature and 17 Freezing -Degree Days Summary September, 1985 4.9 Watana Streamgage Site, Air Tempera ture and 18 Freezing -Degree Days Summary October, 1985 4.10 Watana Streamgage Site, Air Temperature and 19 Freezing -Degree Days Summary November, 1985 4.11 Watana Streamgage Site, Air Temperature and 20 Freezing -Degree Days Summary December, 1985 iii 13 /18 4 1 .0 INTRODUCTION T he 1985 Susitna Rive r freezeup was documented f rom Cook Inlet (RM 0) to the Watan a dam si\e (RM 184 ) by v isu al measurements, ground measurements and ae ria l p hotog r ap h y. T he method s are simi lar to t"lose used in the prev iou s 5 yea r s of ice observations o n t h e Susitna River (R&M Consultants , 1981 , 19 8 2 , 1984, 1985 a ,b). T h e 1985 observations were a contin u ation of b ase line hydrol ogic d a ta c o ll ection along the Susitna River, documenting ic e p r ocesses influe n cin g ice c over formation. The 1985 observations also prov ided a d ditional calibrat ion and verification data for very co ld freezeup conditions for the ICECA L model. The repo rt documents the ch r onology of ice cover de ve lopment in Section 3. Miscellaneous data pertinent to ice modelling are incl uded in Section 4 and in Appendices A and B. Most of the specific processes of freezeup and ice cover progression on the Susitna River have b een previously published (R&M Consultants, 1981, 1982, 1984, 1985 a ,b ). Re ade r s not familiar with t h ese processes should review these reports . T h is report refers to river miles ( RM) numbers for ident ification of specifi c sites on the river mainstream, with the river mouth at Cook Inlet cor respon di g t o RM 0. - 1 - 13/18 5 2.0 SUMMARY Unusually sustained cold weather from mid-October until early December resulted in a very rapid ice cover progression on the Susitna River in 1985. An ice bridge form ed at river rni le ( RM) 1 . 9 on October 21 or 22, with the ice cover extending to RM 19.5 by October 23. There was extensive overflow into Alexander Slough. However, complete ice cover had formed over the overflow by October 25 due to bord er ice growth taking only two days to form instead of the usual 4-6 weeks . This rapid freezeup pattern occurred on most other side-channels which received overflow during freeze-up in 1985. The ice cover advanced r'apidly, prog r essing past Talkeetna and reaching RM 104.5 by November 4. The ice front advanced past the Alaska Rail road bridge at Gold Creek on November 26, several weeks earlier than previous years. The ir:e front continued to advance by staging up to RM 140.5, the lower end of Slough 21. An increase in air temperature and a decrease in frazil ice fro m upstream halted the ice cover progression near this point, and the usual ic e cover formation processes of anchor ice and border ice growth resumed in this reach. Increases in water levels due to staging years. In the middle Susitna River, downstream of Slough 21 were o vertopped. within a foot of the top of the river banks . - 2 - were hi gher than in prev us all slough s and side-channels The top of ice was generally 13/18 6 3.0 CHRONOLOGY OF 1985 SUSITNA RIVER FREEZEUP On October 15, 1985, slush ice was first observed flowing down the mainstem at Gold Creek. Light concentrations of ice (less than 15%) were ob l'e rved through October 18, with the maximum daily temperatures at Gold Creek reading 2 .8°C -4 .4°C. Slush ice concentrations inc,·eased to 50't, on the :norning of October 19, remaining greater than 50% until the ice front progres sed past Gold Creek. On October 21, the ice concentration was 50°o-80% downstream of the head of Alexander Slough . By October· 23, an ice br 'dge had formed at river nd e (RM) 1 .9 , and a continuous ice cover was present to RM 7.5. A second ice bridge had formed at RM 8 , and the ice cover had progressed to RM 19 . 5, just upstream of the head of Alexander Slough. There was extensive overflow into Alexander Slough. At the Susitna-Yentna confluence, the icc concentration was 75°o-80°o on the Yentna River and 400o-50% on the Susitna River. The Yentna River was contributing about 55'l,-60% of the ice downstream of the confluence . A main channel on the east side of the river near the Kashwi tna River had jammed . Ice cover was progressing up the easternmost side channel and had advanced upstream past Sheep Cre ek. The Susitna River was contributing 50°o -55°o, the Chulitna 359o-40%, and the Talkeetna River 10% of the ice downstream of their c onfluences. The Chulitna River had flow in several channels entering the Susitna River . Clear, cold weather continued. On October 2 5 , Alexander Slough was still overtopped. However, it had already frozen over by border ice growth, much sooner than normally occurs after overtopping . Downst ream of the leading edge, numerous side channels had flooded. The ice front had progressed to RM 43.5 up the west c. h an nel of the Delta Islands, an average rate of 12.0 miles/day since October 23 (Table 3 .1). The east channel through the Delta Islands was open, with only small ice pans floating in it . Upstream of the Delta Islands, the mainstem was covered by ice concentrations of 509o-70't,. Tl·.e middle Susitna River was contributing about 60%, the Chulitna River 30°6, and the Talkeetna River 100., of the ic e . On October 29, the east channel through the Delta Islands was s till open from Willow Creek downstream to n ear the confluence with the west channel. Anchor ice was evident near r iffles in this channel. Extensive staging had resulted in most side -channels downstream of the leading edge being breached. Virtually the entire width of the f lo odplain from RM 72 to RM 74 was covered with ice . The leading edge had reached RM 80.2 by early afternoon, progressing at an average rate of 9. 2 miles per day. The leading edge had progressed to RM 94 by the morning of November 1 , an average rate of 4. 6 miles per day since October 29. Temperatures were low, with a minimum of -6°F at Go ld Creek . The Sus ;t na was contributing -:i - . .. 13/18 7 about 60C&, the Chulitna River 2596, and the Talkeetna 15% of the ice to the lower Susitna River. No ice bridges had formed on the Susitna River between Talkeetna and Devil Canyon. Ice concentrations were 50%-85%. Anchor ice was evident, but there were no significant ice dams upstream of Gold Creek . The lower two-thirds of Devil Canyon had an ice cover from slush buildup and staging. There was an open channel on the Chulitna River from Eldridge Gla <...i er south to the Susitna River confl u ence. Some minor overflow was occurring in braided areas where border ice was const r icting flow. The Talkeetna River was open, with about 50% ice concent ratio n. There was extensive anchor ice , with minor anchor ice dams downstream of Chuitna Creek . Temperatures remained very cold . By No vemb er 4, most channel s in the lo wer Susitna River which had breached due to stag ing had al :-eady frozen over . The leading edge was at RM 10 4 .5, progressing at 3 .5 miles per day. Ice cover was progressing up both the Chul itna and Talkeetna Rivers. The leading edge on the Chulitna Ri ver was about 4 miles upstream of the confluence, while the leading e dge on the Talkeetna River was about one-half mile upstream. By November 6, the leading edge had reached RM 110 .5 , progressing at an average rate of 3. 0 miles per day . The ice front had bypassed the side channel from RM 104.2 to RM 105.5 , leaving it open . There was extensive anchor ice in the middle Susitna River. There was little frazil ice at the Watana streamgage site . It appeared that the river was frozen over upstre m of the site for the Watana diversion tunnel, just downstream of Deadman Creek. The temperature dropped to -19°F a t Gold Creek on November 13. By then, the east channel through the Delta Islands had frozen over except for minor leads . Frazil ice concentractions of about 15-20 percent occurred in open leads of the low e r river . The leading edge was at RM 119.8, progressing at 1.33 miles per day. Fo g was h an ging over the open waters upstream of the ice cover. Devil C anyon was frozen over except for about the ups t ream quarter mile. The leading edge had reached RM 133.7 by November 21. Maximum staging levels were surveyed at a n mber of poin t s. E xtensive stag ing had occur r e rl throughout the middle river. At RM 113.7, there was extensi'le pushing, with ice going overbank into the t r ees . The river had staged to within about one foot of the top of the bank in ma ny reaches. Staging levels are shown in Table 3 .2 . On November 25, the leading edge was approaching the Alaska Rail r oad bridge at Gold Creek. The water level rose 2. 7 feet on November 25, 3nd rose over the border ice . The leading edge moved pas t Gold Creek on November 26, with the water level staging a total of 5. 74 feet above the open water level. There was extensive overflow into Upper Side Channel - 4 - 13/18 8 11. An open lead developed on November 27, but it closed up again on November 28. The ice cover continued to prog r ess upstream past r:ol d Creek. On December 5, the leading edge was at RM 140.5, the lower end of Slough 21. The increased water levels results in breaching of the lower and middle side-channels to Slough 21. Upstream of Devil Canyon, the river was open until roughly RM 170. An ice bridge had formed in this area, and ice cover extended upstream past RM 183 . - 5 - 13/18 9 Date 10/23/85 10/25/85 10/29/85 11/1/85 11/4/85 11/6/85 11/13/85 11/21/85 11/26/85 12/5/85 LE = Leading Edge TABLE 3.1 1985 Susitna R iver Freezeup Leading Edge (LE) Progression Summary Location Rate of Advance Ice Bridge RM 1. 9 Continuous to RM 7. 5 Ice Bridge RM 8 LE RM 19.5 8 .5 miles/d ay LE RM 43 .5 12 .0 mi les /day LE RM 80.2 9 .2 miles/day LE RM 94 4 .6 miles /day LE RM 104.5 3.5 miles/da y LE RM 110.5 3.0 miles/day LE RM 119.8 1 .33 miles/day LE RM 133.7 1. 74 miles/day LE RM 136.5 0 .56 miles/day LE RM 140.5 0 .44 mi l es/day -6 - 13/18 10 TABLE 3.2 Water Surface Elevations 1985 Freeze -Up Date 10/11/85 10/29/85 11 /'l/85 11/21/tS S 12/5/85 Flow (cfs), Susitna R . at Gold Creek 8,640 3 ,800 3,100 2,400 Flow (cfs) Susitna R. at Sunshine 20,600 8,600 7,000 5,400 RM 40 69 .86 71 .26 RM 47.8 (East) 103 .67 103 .67 RM 47 .8 (West) 101 . 11 105 .17 RM 59.7 (East) 145 .58 RM 59 .7 (West) 146.90 148 .40 RM 76 .8 234 .31 239.62 RM 93.1 (East) 308 .13 305.71 311 .66 (ice) RM 93.1 (West) 6.98 9.64 2.00 (ice) RM 103.3 (LRX-9) 5 . 40 (ice) RM 106.3 RM 113.0 (LRX-18) 456 .59 462 . 50 (ic e) RM 113 .7 9.94 1 .13 (ice) RM 120.5 (LRX-24) 519.47 523 .61 (ice) -7 - 13/18 11 Date Flow (cfs), SLositna R. at 10/11/85 Gold Creek 8,640 Flow (cfs) Susitna R. at Sunshine 20,600 RM 123.3 (LRX-27) RM 126 .1 (LRX-29) RM 128 .7 ( LRX-30N3R. B.) RM 134.2 (LRX-40) TABLE 3.2 (continued) Water Surface Elevatio ns 1985 Freeze-Up 10/29/85 11/6/85 3,800 3,100 8,600 7,000 - 8 - 11/21/85 2,400 5,400 576 .53 (ice) 622 .36 (ice) 12/5/85 545 .98 (ice) 661.49 (ice) 13/18 12 4 .0 METEOROLO GY AND DATA COLLECTION Daily measurements of ice and meteorological parameters were made at the Go ld Creek Bridge by Nancy Larson . Twice per day, usually at sunrise and sunset, she obtained data on the air temperature at the water surface, minimum and max im um daily air temperatures, water temperature , water velocity, stage , shore ice width and thickness, and estimated slush ice concentration on the water surface. These data are listed in Appendix A. Weather data from the Talkeetna Flight Serv ice Station (National Weath e r Service) and Watana (R&M Consultants, Inc .) for September through December 1985 are included in Appendi x B. Air temperature data for these stations, were summarized and are lis te d in Tables 4.1 t o 4. 7 along with accumulated freezing degree -days. Temperatures were unusually low from mid -Oc tob er unt il early December . At Talkeetna, total accumulated freezing degree-days were about twice their normal level at the end of November. At Watana, freezing degree-days were about 50% greater than normal at the end of November, but were about normal by the end of December , as temperatures were rea ltively high for most of December . -9 - 13/18 13 Table 4 .1 Talkeetna We ather Station Air Temperature and Freezing Degree-Da•.ts Summary Septembe r 1985 Day Minimum (oC) Maximum (oC) Average (°C) 1 9 .4 12 .8 2 7.2 15.0 3 6.1 16 .7 4 1.1 17 .2 5 2.2 18.9 6 6 .7 15.6 7 5.6 12.8 8 8 .3 13 .~ 9 3 .3 13 .9 10 -1.7 11. 1 11 1.7 12 .2 12 -0 .6 8 .9 13 5.6 11.7 14 7.2 11 .7 15 5.6 15 .0 16 2 .2 15 .0 17 -0.6 11.7 18 -1. 1 3 .9 19 3.3 7.2 20 -1. 1 9.4 21 -2.8 ~0 .6 22 0.6 4 .4 23 3.3 5.0 24 3.3 8 .3 25 0 .0 10.0 26 0.0 5 .6 27 3 .3 10 .6 28 5.0 8 .3 29 5.0 10 .6 30 .A..4 11.7 Mean Monthly Air Temperai::ure Total Monthly Freezing Degree-Days Total Accumulated Freezing Degree-Days Average: Historical Accumulated Freezing Degree -Days -10 - 11. 1 11. 1 11.7 9 .4 10.6 11. 1 9.4 11. 1 8.9 5.0 7.2 4.4 8.9 9 .4 10.6 8 .9 5.6 1 . 7 5.6 4.4 3 .9 2 .8 4.4 6 .1 5.0 2.8 7 .2 6 .7 7.8 8.3 7 .2°C 0.0 0.0 0.0 13/18 14 T b le 4 .2 Talkeetna Weat her Station Air Temperature and Freezi ng Degree -Days Summary October 1985 Day Minimum (oC ) Maximum 1 1 . 1 11. 1 2 -1. 1 8 .9 3 -1 . 1 8.9 4 -3.9 8 .9 5 -4.4 7 .8 6 -0.6 5.6 7 1 . 1 5 .0 8 2.2 6.1 9 -1.7 8.3 10 -4.4 6.1 11 -5.0 7.8 12 -4.4 5.6 13 -2.8 7.8 14 -7.2 5.0 15 -2 .2 1.7 16 -1 . 1 3 .3 17 -7.2 1.1 18 -2.8 1. 7 19 -7.8 1 . 1 20 -11 . 1 -2.8 21 -7.2 -0.6 22 -10.6 -1 . 1 23 -11.7 -2.8 24 -18.9 -6. 1 25 -19.4 -7 .8 26 -13.3 -2.2 27 -18.9 -5.0 28 -11. 1 -2 .2 29 -16.7 -2.8 30 -20.6 -7.2 31 -22.2 -10.0 Mean Monthly Air Temperature Total Monthly Freezing Degree-Days Total Accumulated Freezing Degree-Days (oC) Average Historical Accumulated Freezing Degree-Days -11 - 6.1 3.9 3.9 2 .8 1.7 2 .8 3 .3 4.4 3 .3 1 . 1 1.7 0 .6 2.8 -1.1 0.0 1 . 1 -2 .8 -0.6 -3.3 -6.7 -3.9 -5.6 -7 .2 -12.2 -1 3.3 -7 .8 -11 . 7 -6 .7 -9.4 -13.9 -16. 1 -2.8°C 122.3 122.3 72.0 13/18 15 Table 4.3 Talkeetna Weather Station Air Temperature and Freezing Degree-Days Summary November 1985 Day Minimum (DC) Maximum (DC) Average (DC) 1 -23.9 -1202 2 -2506 -15 00 3 -2202 -1006 4 -2404 -607 5 -11 0 1 -506 6 -160 1 -60 1 7 -20 00 -506 8 -21 01 -702 9 -809 -506 10 -5 06 -208 11 -208 1 0 1 12 -22 02 -1. 1 13 -2500 -7 08 14 -2506 -100 0 15 -2904 -1309 16 -2904 -11.7 17 -22 08 -904 18 -2208 -809 19 -23 09 -11 0 1 20 -2309 -1208 21 -2202 -1208 22 -2107 -12 08 23 -2208 -1303 24 -2309 -14 04 25 -2309 -7 02 26 -708 -4 04 27 -708 -50 6 28 -1404 -6 07 29 -1809 -803 30 -904 -404 Mean Monthly Air Temperature Total Monthl y Freezing Degree -Days Total Accumulated Freezing Degree -Da y s Average Historical Accumu lated Freezing Degree-Days -12 - -1803 -20 06 -160 1 -150 6 -803 -11 0 1 -12 08 -130 9 -7 02 -309 -0 0 ~ -11.7 -16 0 1 -17 08 -2 1 07 -20 06 -16 0 1 -15 06 -1702 -18 01 -17 02 -1702 -1803 -1904 -1506 -5 06 -607 -100 6 -13 0 3 -6 07 -13o8°C 41401 53604 26300 13/18 16 Table 4.4 Watana Weather Station Air Temperature and Freezing Degree -Days Summary September 1985 Day Minimum (oC) Maximum (oC) 1 6 .0 9 .6 2 1 . 9 10 .6 3 1 .3 10 .9 4 -1.2 11. 1 5 0.4 13 .0 6 3 .0 11.3 7 4.6 12 .4 8 5 .6 9.0 9 1 .4 8.8 10 0.1 8.2 11 0 .5 8 .0 12 -0.5 5 .1 13 -2 .6 9 .3 14 4.7 8 .1 15 3.4 7.0 16 -2 .6 4.0 17 -3.8 5.8 8 -2.9 2 .4 19 0.0 2 .8 20 -3 .5 1.2 21 -4.7 5 .5 22 -0.6 0 .9 23 -0 .3 2.4 24 0 .9 4.9 25 -2. 1 3.9 26 -0.9 3 .1 27 3 .2 8.2 28 0 .5 5.3 29 0.5 7 .7 30 0.5 6 .2 Mean Monthly Air Temperature Total Monthly Freezing Degree-Days Total Accumulated Freezing Degree -Days Average Historical Accumulated Freezing De gree -Day s -13 - Average ( °C) 7.8 6.3 6.1 5 .0 6 .7 7.2 8.5 7.3 5 .1 4 .2 4 .3 2 .3 3 .4 6.4 5.2 0.7 1.0 -0 .3 1.4 -1 .2 0.4 0 .2 1 . 1 2 .9 0.9 1 . 1 5.7 2.9 4 .1 3.4 -3. 7°C 1.5 1.5 13.0 13/18 17 Table 4.5 Watana Weather Station Air Temperature and Freezing Degree-Days Summary Octobe r 1985 Day Minimum (oC) Maximu m 1 -1 .0 5.0 2 -0.9 3.0 3 -2.5 3 .0 4 -6.2 4 .6 5 -7.4 4 .7 6 -2 .1 2.6 7 -1.6 1.2 8 0 . 1 1.8 9 -1.4 3 .7 10 -4 .6 6 .0 11 -3 .1 2 .8 12 -5. 1 1.6 13 -5 .8 2.3 14 -6.6 -1 . 1 15 -5 . 1 -0 .5 16 -6.7 1.7 17 -7 .0 0 .1 18 -9.9 -2 .9 19 -13 .5 -5 . 1 20 -15.9 -9 .2 21 -12 .3 -4 .7 22 -13 .6 -5.9 23 -17.2 -7.7 24 -21 .7 -9 .9 25 -18 .9 -13 . 1 26 -18.9 -9 .3 27 -19 .5 -11 . 1 28 -18.0 -7 .0 29 -18.7 -8 .0 30 -20.4 -12 .0 31 -21 . 1 -14.4 Mean Mont: ly Air Temperature Tota l Monthly Freez i ng Degree-Days Total Accumulated Freezing Degree-Days (oC) Ave rag e Historical Accumulated Freezing Degree -Days -14 - Average (°C) 2 .0 1.1 0.3 -0 .8 -1 .4 0.3 -0.2 1.0 1. 2 0 .7 -0.2 -1.8 -1.8 -3.9 -2.8 -2.5 -3.5 -6.4 -9 .3 -12.6 -8.5 -9 .8 -12.5 -15 .8 -16 .0 -1 4. 1 -15.3 -12.5 -13 .4 -16 .2 -17.8 -6 .2°C 199 .1 200 .6 140 .0 13/18 1A Table 4 .6 Watana Weather Station Air Temperature and Freezing Degree -Days Summary November 1985 Day Minimum (oC) Maximum (oC) 1 -22 .8 -16 .4 2 -22.8 -12 .0 3 -20 .8 -10.4 4 -22 .2 -12.2 5 -22 .5 -14 .3 6 -21 .6 -11 .5 7 -24 .5 -14 . 1 8 -22 .9 -13.0 9 -13.9 -10 .7 10 -11 .0 -6.0 11 -13.0 -3.6 12 -16. 1 -8.0 13 -21. 1 -11 .0 14 -25.1 -15.6 15 -26 .5 -15.9 16 -26.2 -14 .6 17 -17 .5 -1 3 .5 18 -17.8 -10.4 19 -19 .4 -8.7 20 -19.0 -4 .2 21 -1 5.9 -4 .4 22 -18.8 -10.5 23 -17.0 -10 .7 24 -13.6 0. 1 25 -12.6 -4 .3 26 -13.4 -9. 1 27 -12.4 -9 .2 28 -19 .3 -1 2. 1 29 -18.2 -14.6 30 -19.7 -12 . 1 Mean Monthly Air Temperature Total Monthly Freezing Degree-Days Total Accumulated Freezing Degree -Days Average Historical Accumulated Freezing Degree -Days -15 - -19 .6 -17 .4 -15.6 -17 .2 -18 .4 -16 .6 -19 .3 -18.0 -12 .3 -8 .5 -8.3 -12. 1 -1 G. 1 -20.4 -21.2 -20 .4 -15 .5 -14. 1 -14 . 1 -11.6 -10.2 -14.7 -13.9 -6 .8 -8.5 -11 . 3 -lfl.8 -15 .7 -16 .4 -15.9 -14 .7°C 440.9 641 .5 420.6 13 /18 19 Tab I 4 .7 Watana Weather Station Air T mperature and Freezing Degre -Days Summary C. cember 1985 Day Minimum (oC) Maximum (oC) 1 -21 .0 -11 . 6 2 -18 . 1 -10 .6 3 -22.6 -15. 1 4 -22.9 -9.7 5 -19.1 -11 . 7 6 -20.6 -14.7 7 -17.4 -7.4 8 -7.P. -3.8 9 -3.6 0.1 10 -2.2 1.7 11 0.3 4.8 12 -9.7 0.4 13 -12.7 -7. i 14 -9.5 -5.8 15 -9.2 -4.8 16 -6.9 -3.3 17 -8.5 -4 .5 18 -9.2 -2.6 19 -3.0 1. 9 20 -1.8 3 .2 21 0.8 3.5 22 -1.2 3 .2 23 -0.4 3 .2 24 -3.5 3.4 25 -1 0.3 -2.5 26 -3.6 -2.3 27 -4.6 -1.8 28 -7.2 -2.7 29 -5.6 -3.5 30 -6.7 -4.1 31 -8.1 -4.8 Mean Monthly Air Temperature Total Monthly Freezing Degree-Days Total Accumulated Freezing Degree-Days Average Historical Accumulated Freezing Degree -Days -16 - -16 .3 -14.4 -18 .9 -16 .3 -15 .4 -17 .7 -12 .4 -5.7 -1.8 -0.3 2.6 -4.7 -9.9 -7.7 -7.0 -5 . 1 -6.5 -5.9 -0.6 0.7 2.2 1.0 1.4 -0.1 -6.4 -3.0 -3.2 -5.0 -4 .6 -5 .4 -6.5 -6.2°C 200.8 842.3 874.4 13/18 20 Date 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Table 4.8 Watana Streamgage Sit Air Temperature and Freezing Degree-Days Summary September 1985 Minimum (°C) Maximum (°C) Average (°C) 5 .0 13.0 9 .0 3.0 16.0 9 .5 1 .0 16 .5 8.8 -1.5 16 .0 7 .2 -2 .0 18.5 8.2 3.5 14.5 9.0 7.5 14.0 10.8 6.0 12 .0 9.0 2.5 14.5 8.5 2.0 12.5 7.2 3.5 13 .0 8 .2 1 .0 8.0 4.5 1. 5 13 .5 7.5 8 .0 11 .5 9.8 7.0 10.0 8.5 0.0 9.0 4 .5 -3.0 12.0 4 .5 0.5 5.5 3.0 2.5 6 .5 4.5 0.5 5 .5 3.0 -1.5 10.5 4.5 2.0 5.0 3.5 3.0 5.5 4.2 3 .0 8.5 5.8 0.0 9 .5 4.8 1. 0 6.5 3 .8 5.5 13.0 9 .2 4 .5 9.0 6.8 2 .0 12.0 7.0 2.0 10 .5 6.2 Average Mean Monthly Air Temperature 6. 7°C Total Monthly Freezing Degree-Days 0 Total Accumulated Freezing Degree-Days 0 -17 - Deviation From Watana Weather Station ( C) 1.2 3 .2 2 .7 2.2 1 . 5 1.8 2 .3 1.7 3 .4 3.0 3 .9 2.2 4.1 3.4 3.3 3 .8 3.5 3 .3 3.1 4 .2 4.1 3.3 3.1 2.9 3.9 2 .7 3 .5 3.9 2 .9 2.8 3 .0°C 13/18 21 Date 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 Table 4.9 Watana Streamgage Sit Air Temperature and Freezing Degree-Days Summary Octobe r 1985 Mini mum (°C) Maximum (°C) Average (°C) 0.0 9.5 4.8 0.0 7 .5 3 .8 2.5 7 .5 5 .0 -4 .5 9 .5 2 .5 -6.0 9.5 1.8 -0.5 7 .0 3 .2 2.0 5 .0 3 .5 2.5 5.0 3 .8 2 .5 9.0 5.8 -2.0 5 .0 1.5 -2.5 5.0 1.2 -9.0 2.5 -3.2 -6 .0 3 .0 -1 .5 -9 .5 0 .5 -4 .5 -8 .0 0 .5 -3 .8 -8.0 4 .0 -2 .0 -8 .0 0 .5 -3 .8 -14 .0 -3.0 -8.~ -16.0 -3 .5 -9.8 -14 .0 -8 .0 -11 .0 -11.5 -4 .0 -7.8 -17.5 -5 .0 -11.2 -20 .5 -7 .0 -13 .8 -23 .0 -9 .5 -16 .2 -21 .5 -12 .0 -16.8 -19 .0 -8.5 -13.8 -18 .5 -11 . 5 -15 .0 -1 6 .0 -8 .0 -12 .0 -20.5 -8.5 -14.5 -21.5 -13 .0 -17 .2 -19 .0 -16 .0 -17.5 Av erage Mean Monthly Ai r Temperature -5.4°C Total Monthly Freezing Degre e-Day s 203.9 Total Accumulated Freezing Degree -Day s 203.9 -18 - Deviation From Watana Weather Station (oC) 2 .8 2.7 4 .7 3 .3 3 .2 2 .9 3 .7 2 .8 4.6 0.8 1.4 -1.4 0.3 -0.6 -1.0 0.5 -0.3 -2 .1 -0.5 1.6 0 .7 -1.4 -1 .3 -0 .4 -0.8 0.3 0.3 0 .5 -1. 1 -1.0 0.3 0.8°C 13/18 22 Date 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Tabl 4 .10 Watana Streamg age S ite Air Temperature and Freezing Degree -Days S ummary November 1985 Minimum (DC) Maximum (DC) Average (°C ) -23 .0 -15 .0 -19 .0 -23 .0 -15 .0 -19.0 -24 .0 -1 5 .5 -19 .8 -28 .0 -12 .0 -20 .0 -25.0 -13 .0 -19 .0 -24.0 -17 .0 -20 .5 -26.5 -19.5 -23 .0 -26.5 -13.0 -19.8 -15 .0 -11 . 0 -13 .0 -11.0 -7.0 -9 .0 -15 .0 -4.0 -9 .5 -23 .0 -10 .0 -16 .5 -27 .5 -20.0 -22.8 -30.0 -23 .5 -26 .8 -33.0 -26 .0 -29.5 -34.5 -14.0 -24.2 -24.0 -13 .5 -18.8 -24.0 -18.5 -21.2 -25 .5 -21 .0 -:l3.2 -24.5 -11 .0 -17.8 -22.5 -9 .0 -15 .8 -25.0 -20 .5 -22.8 -25.0 -20.0 -22.5 -26.0 -21.0 -23.5 -22.5 -10 .5 -16 .5 -12.0 -8.5 -10 .2 -11.5 -8.0 -9 .8 -26.0 -11 . 0 -18 .5 -27.5 -16 .0 -21 .8 .,.22.0 -12 .5 -17.2 Average Mean Monthly Air Temperature -19.0°C Total Monthly F reezirtg Degree-Days 571 .0 Total Accumulated Freezing Degree -Days 774.9 -19 - D evi ation From Watana Weather Stati on (DC) 0.6 -1 .6 -3.2 -2.8 -0.6 -3.9 -3.7 -1.8 -0 .7 -0.5 -1.2 -4.4 -6.7 -6.4 -8.3 -3 .8 -3 .3 -7 . 1 -9 . 1 ··6 .2 -5.6 -8 .1 -8.6 -16.7 -8.0 1 . 1 1 .0 -2 .8 -5 .4 -1.3 -4.3DC 1;,/18 23 Date 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 Table 4 .11 Watana Streamgage S ite Air Te mperature and Freezing Degree -Days Summary De cember 1985 Minimum {°C) Ma x imum {°C) Average {°C) -24 .0 -15 .0 -19.5 -26.5 -16 .5 -2 1 .5 -31.0 -27.0 -29 .0 -30 .0 -22 .0 -26 .0 -2.J .:. -14.0 -19.8 -27 .0 -17.5 -22 .2 -25 .5 -17 .0 -21.2 -16.5 -3 .0 -9 .8 -3 .0 -0.5 -1.8 -5 .5 2 .0 -1.8 -1.5 5.0 1.8 -13 .5 -1.0 -7.2 -20.5 -13.5 -17.0 -19.5 -9.0 -14.2 -15 .5 -9.0 -12.2 -12.0 -4.0 -8 .0 -11.0 -3.5 -7.2 -16 .0 -3.0 -9.5 -5.0 1.5 -1 .8 3.5 2 .0 -0 .8 0.0 4.5 2 .2 -5 .5 4 .0 -0 .8 -0.5 4 .0 1.8 2 .5 4.0 0.8 -12.5 -1.5 -7 .0 -6 .5 -1.5 -4.0 -9 .5 -3.0 -6.2 -6.0 -4 .0 -5.0 -10.0 -4.0 -7 .0 -10 .0 -4.5 -7 .2 -9.5 -4.5 -7 .0 Average Mean Monthly Air Temperature -9. 3°C. Total Monthly Freezing Degree-Days 294.7 Total Accumulated Freezing Degree-Days 1069.6 -20 - D v ia tio n From Watana Weather Station (OC) -3 .2 -7. 1 -10. 1 -9 .7 -4 .4 -4 .5 -9 .8 -4 .1 0 .0 -1.5 -0 .8 -2 .5 -7. 1 -6 .5 -5 .2 -2.9 -0 .7 -3 .6 -1 .2 -1.5 0 .0 -1.8 -0 .4 -0 .9 -0.6 -1.0 -3 .0 0.0 -2 .4 -2.8 -0.5 -3 .1 °C 13/18 24 6. 0 REFERENCES R&M ... onsultants, Inc. 1981 . Ice Observ ations Alaska. Alaska Power Authority. Susitna Report for Acres Ame . ican , Inc . 1 Vol. 1980 -81 . Anchorage, Hydroelectric ProJec t . 1982. Ice Observations 1981 -82 . Anchorage, Alaska . Alaska Power Authority. Susitna Hydroelectric Project. Report for Ac res American, Inc. 8 Vol. 1983. Susitna River Ice Study 1982 -1983. Anchorage, Alaska . Alaska Power Authority . Susitna Hydroelectric Proj e ct. Report for Harza-Ebasco Susitna Joint Venture. 1 Vol. 1985. Susitna River Ice Study 1984-1985. Anchorage, Alaska . Alaska Power Authority. Susitna Hydroelectric Project . Report for Harza-Ebasco Susitna Joint Venture. 1 Vol. Document No . 2747. -~1 - 9/17 1 1985 L oca ti on : Su s itn a River FR EEZE-UP OBSERVATION at Go ld Crt.:lk Air TemQ, Water Min Max Temp Ice Level Velocity Shore Ice Date ~ ~ ~ Cone ~ FtLSec Width lll....m!B.tl Snowfa I I Wea the r 10/01/85 34 39.6 0 53 .80 0 0 0 Pa rt I y c I oudy, showers 44 39.4 0 53.70 4.4 0 0 0 Ov ercast, showers 10/02/85 30 39 .4 0 53.67 4 .3 u 0 0 Light rain :;o 39.2 0 53 .61 0 0 0 Ov r cast 10/03/85 34 38.7 0 53.57 4.6 0 0 0 Clear 46 38.7 0 53.53 0 0 0 Clear 10/04/85 25 36 .9 0 53.44 4.3 0 J 0 Clear 46 36.5 0 53.39 0 0 0 Clear 10/05/85 22 0 53.30 4 .4 0 0 0 Clear ·46 36.5 0 53.22 0 0 0 Clear 10/06/85 28 36.3 0 53.10 4 .0 0 0 0 Overcast 42 36.3 0 53.05 0 0 0 Ra in 10/07/85 26 36.5 0 53. 13 4.0 0 0 l ·~ Rai n /snow showers ~ 44 36.5 0 53 0 10 0 () 10/08/85 30 36.7 0 53. 15 3.8 0 0 l" Sn o w a 1 rain 43 36.5 0 53 0 15 0 0 1" 10/09/85 32 37.4 0 53.16 3.9 0 0 0 Mostly C l OU dy 46 3 7 o8 0 53o20 0 0 0 Partly CIJudy 10/10/8~ 27 37.4 0 53 0 14 0 0 0 Cl e ar 42 37 .4 0 53 0 12 3 o8 0 0 0 Clear 10/11/85 31 36. 1 0 52 .88 0 0 0 Clear 45 36.5 0 52 o95 3.6 0 0 0 C l ear 10/12/85 21 35.8 0 52o77 0 0 0 Cloudy 40 35.8 0 52o75 3o6 0 0 0 Cloudy 10/13/85 28 36.0 0 52.67 0 0 0 Partly cloudy 40 35.8 0 52.6 4 3.3 0 0 0 Partly cloudy 10/14/85 24 33o8 0 52.44 0 0 0 Clea r 44 34.0 0 52.45 3 . 1 0 0 0 Part I y c I oudy 10/15/85 22 33.8 5 52o40 0 0 0 v vercast with fog, sno 38 34 .2 3 52o35 3 .2 0 0 ,A .. Snowing 10/16/85 26 33o8 w · 52.32 0 0 4 40 33.8 0 5 2 o3 0 3. 1 0 0 0 10/17/85 18 32 .7 15 52.29 2.3 3/4 " 0 Clear 38 33o4 3 52 o36 3 o3 0 0 0 Overcast, windy 10/18/85 28 33o6 J 5 2 o25 0 0 0 Ove r cast, strong east w i nd 37 33 0 1 5 52o 20 3o 2 0 0 0 Windy 1 0 /19/85 16 32.7 50 5 1.96 5o 6 1 1r 0 Clear 32 3205 4 0 510 50 3 .0 7 o3 6 " 0 Part I y c I oud~ 10/20/85 8 32o4 7 5 5 1 0 20 0 Overcast, wind 28 32 .4 60 51o19 3o0 23 0 Winoy 10/21/85 15 3 2 .4 6 0 50o85 26 18 0 C lear/wind 32 32 .4 50.83 2.5 26 . ·-16 0 C I ear/w ind 10/22/85 14 32.2 7 5 50 .8 1 26 11-16 0 Clear 30 3 2 .2 7 5 50 .8 1 2.4 26 11-16 0 Clear 9/17 2 1985 Locat ion : Sus i tn• Ri ver FREEZE-UP OBSERVATION at Cold Creek _M.r._~ Water Min Max Temp Ice Level Veloc ity Shore Ice Date ~ ~ ~ Cone ~ FtLSec width (at edge) Snowfall weuher 10/23/85 -2 32.2 65 50.79 27 11-16 0 Clear/wind 30 32.2 65 50.19 2.4 27 11-16 0 Clear/wind 10/24/85 -7 32.2 65 50.5 4 30 15 0 Clear 17 32.0 70 50.54 2.4 30.3 15 0 Part 1 y c 1 oudy 10/25/85 3 32.2 60 50.53 30.6 16 I) Hi q h overcast/ I i ght 'ol ind 17 32.2 60 50.53 2.8 31.1 16 0 10/26/85 4 32.2 70 50.53 '\2 16 0 High overcast/strong NE wind 24 32.2 75 50.53 2.9 33.5 16 0 10/27/85 6 32.2 70 50.69 34 14 0 Clear/moderate N 'ol ind 24 32.2 70 50.69 2.8 34. 1 14 0 10/28/85 16 32.2 70 50.61 34.3 6" 0 Part ly cloudy/moder H w ino 28 32.2 70 50.67 3. 1 34.4 4 0 Clear/ I igh t H w ind 10/29/85 2 32.0 75 50.65 34.7 0 Clear/calm 26 32.0 75 50.65 3. 1 34.8 6 0 Clear/ I ight N wind 10 /30/85 4 32.2 75 50.65 34.8 0 Clear/moderate N 'olind 24 32.2 15 50.65 3.0 0 ClePr/moderat~ H w ind 10/31/85 11/01/85 -6 32.2 80 50.70 35.3 4-6 0 Clear/calm 15 32.2 80 50.10 3. 1 35.3 4-6 Trace Clear/calm 11/02/85 -10 32.2 80 50 .71 35.4 4-6 0 Clear/calm 10 32.2 80 50.71 3. 1 35.4 4-6 0 Clear/ca lm 11/03/85 -10 32.2 75 50.11 35.4 4-6 0 Clear/calm 1v 32.2 75 50.71 2 .9 35.7 7 0 Clear/calm 11/04/85 -12 32.2 15 50.70 36 7 0 C I ear/moderate N w ind 21 32 .2 75 50.7 0 2.9 36 7 0 Clear/mod erate N wind 11/05/85 -2 32.2 75 50.70 36.4 5-8 0 Partly cloudy/cal• 16 32.2 15 50.70 2.7 36.4 5-8 0 Partly cloudy/cal• 11/06/85 -4 32.2 80 50.70 37. 1 8 0 Part I y c I oudy 12 32.2 80 50.10 2.3 37. 1 4-10 0 11/07/85 -10 32.2 80 50.70 37.6 8 0 Clear/modera te H wind 18 32.2 80 50.70 2.3 38 6-8 0 11/08/85 -10 32.2 80 50.70 39.3 10-12 0 Clear/moderate 'wl ind 21 32.2 80 50.70 2.5 29.6 10-12 0 11/09/85 6 32 .4 65 50.72 40 10-12 0 Cloudy/calm 24 32 .4 65 50.72 2.7 4 0 10-12 Trace Snowing/calm 11/10/85 15 32.4 55 50.70 42.5 4 2 Snowing/ I ight N w nd 27 32.4 55 50.70 2.9 4 2.7 4 2 Snow • ng/ I i ght N w nd 11/11/85 14 32.4 55 50.70 4 2.7 4 8 Snowing/ I ight N w nd 25 32.4 55 50.72 2.8 43 4 4 Snowi ngjmod rate ind 11/12/85 10 32 .4 55 50.72 2.7 43 .4 0 Part ly cloudy 30 3C..4 60 50.74 0 Clear 9/17 2 1985 Location: Susitna River FREEZE-UP OBSERVATION at Gold Creek Air Tem12. Water Min Max Temp Ice Leve I Velocity Shore Ice Date ~ ~ ~ Cone ~ FtLSec ~ (at edge) Sno'Wfa II We a ther 10/23/8 5 -2 32.2 65 50.79 27 11 -16 0 Clear/'Wind 30 32.2 65 50.79 2.4 27 1 1-1 6 0 Clear/'Wind 10/24/85 -7 32.2 65 50.54 30 15 0 Clear 17 32.0 70 50.54 2.4 30.3 1 5 0 Pa rt 1 y c I oudy 10/25/85 3 32.2 60 50 .53 30.6 16 0 High overcast/ I ight N 'Wind 17 32.2 60 50.53 2.8 31 . 1 16 0 10/26/85 4 32.2 70 50.53 32 16 0 High overcast/strong NE 'W i nd 24 32.2 75 50.53 2 .9 33.5 16 0 10/27/85 6 32.2 70 50.69 34 14 0 Clear/moderate N wind 24 32.2 70 50.69 2.8 34. 1 14 0 10/28/85 16 32.2 70 50.61 34.3 6" 0 Partly cloudy/moder N w ind 28 32.2 70 50.67 3. 1 34.4 4 0 Clear/l i ght N wind 10/29/85 2 32.0 75 50.65 34.7 0 Clear/calm 26 32.0 75 50.65 3 . 1 3 4.8 6 0 Clear/ I ight N wind 10/30/85 4 32.2 75 50.65 34.8 0 Clear/moderate N wind 24 32.2 75 50.65 3.0 0 Clear/ oderate N wind 10/31/85 11/01/85 -6 32.2 80 50 .70 3 5 .3 4 -6 0 Clear/calm 15 32.2 80 50.70 3 . 1 35.3 4-6 Tra ce Clear/calm 11/02/85 -10 32.2 80 50.71 35 .4 4-6 0 Clear/calm 10 32.2 80 50.7 1 3. 1 3 5.4 4-6 0 Clear/calm 11/03/85 -10 32.2 75 50.71 3 5 .4 4-6 0 Clear/calm 10 32.2 75 50.71 2.9 35.7 7 0 Clear/calm 11/04/85 -12 32.2 75 50.70 36 7 0 Clear/modera e N w ind 21 32 .2 7 5 50.70 2.9 36 7 0 Clear/moderate N wind 11/05/85 -2 32.2 75 50.70 36.4 5-8 0 Partly cloudy/cal• 16 32.2 75 50.70 2.7 3 6 .4 5-8 0 Partly cloudy/cat• 11/06/85 -4 32.2 80 50.70 3 7. 1 8 0 Pa rt t y c I oudy 12 32.2 80 50.70 2 .3 37.1 4-10 0 , /07/85 -10 32.?. 80 50.70 3 7 .6 8 0 C tear/moderato N wind 18 32.2 80 50 .70 2.3 38 6-8 0 11/0 8/85 -10 32.2 80 5 0 .70 39 .3 10 -1 2 0 Clear/moderate N 'W ind 21 32.2 8 0 5 0 .70 2 .5 29 .6 10 -12 0 11/09/85 6 32.4 65 50 .72 40 10-12 0 Cloudy/calm 24 32.4 6 5 5 0.7 2 2 .7 4 0 10-12 Trace Sno'Wing/catm 11/10/85 15 32.4 55 50.7 0 42.5 4 2 Snowing/ I i ght N w nd 27 32.4 55 5 0 .70 2.9 42.7 4 2 Sno....ing/1 ight N w no 11/11/85 14 32.4 55 50 .70 42.7 4 8 Snowing/ I ight N w nd 2 5 32.4 5 5 50.72 2 .8 43 4 4 Sno'Wong/moderate 'Wind 11/12/85 10 32.4 55 5 0 .72 2.7 43.4 0 P rtly cloudy 30 32.4 60 5 0.74 0 Clear ~· 9/17 3 1985 Location: Susitna River FREEZE-UP OBSERVATION at Gold Creek Air Tem~.._ Water Min Max Temp Ice Level Ve locity Shore Ice Date ~ ~ ~ ~one ~ FtLSec Wi dth (ale edge} Sno~f a II Weather 11/13/85 -19 32.2 65 50.79 2.7 4 3.6 2-4 0 Clear/wind -2 32.2 70 50.80 0 Strong N wind 11/14/85 -19 32.2 70 50.86 2 .5 43.8 2-4 0 Clear 0 32.2 70 0 11/15/85 -16 32.2 80 50.84 2 .6 4 4 2-4 0 Clear 2 32.2 80 0 Calm 11/16/85 -18 32.2 85 50.85 2.7 44 2-4 0 Partly cloudy 2 32.2 80 50.85 C• Calm 11/17/85 32.2 80 50.87 2.7 45 .2 3-6 0 Partly cloudy/ I i<;ht N w i nd 20 32.2 80 50 .87 0 11/18/85 -8 32.2 85 51.0 7 2.5 45.7 3-6 0 Clear/ I ight N wind 18 32.2 85 51.07 0 11/19/85 -8 0 4 11/20/85 -6 32.0 51.13 2.4 0 7 0 11/21/85 -2 32.2 50 .97 2 .4 0 10 0 11/22/85 -3 32.4 50 51.08 2.5 0 Clear 4 0 11/23/85 -4 32.2 75 50.83 Pressure r i dges; ice 0 Clear 2 Overshelf & broken 0 11/24/85 -5 32.0 80 50.81 0 Clear 3 0 Calm 11/25/85 -4 80 53.50 2. 1 Ice dam ~ownstream 0 Clear 2 Wat er ove r shelf 0 Calm 11/26/85 -4 100 56.55 0 Cloudy 24 Ice stopped 1:16 pm Light snow 11/27/85 14 50 (in 56.50 Channel open 0 24 channe 1 ) 0 11/28/85 -12 100 56 .54 Jammed again 0 Clear 16 0 11/29/85 C losed under br idge 0 0 11/30 /85 20 C I osed under bridge; o pe n leads upstream and downst ream 12/01/85 12/02/85 12 Closed under bridge; open leads upstream and downstream l() co m ~ 0... ·~~ ~--(f) < ~ (f) < ......:l < < z E--o ~ ~ .,. ~ .. ......:l < E--o <fP ,,.~ 'l LklliNA, AI A$U W(A SIR (Q ~IUCI "(I 08~ LOC L CLIMATOLOGICAL ~!AI( AI RPOR I onthly Su mary LIIIIUO! 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ON[ OF IHR[[ WINO SPEED S IS GIY[N UNDER rA SI[S l MI L[: rASIES T "IL[ • HIGH[S1 RECORDED SPEED FOR WH ICH A MI L[ OF WIN O PASSES SI AIION I OIRECIION IN CO "PA SS POINISI . rASTESI OBSERVED ONE "INUT [ WINO · HIGHES T ON E "!NUT[ SP£[0 IO IR[CII O~ I N lE NS or DEGREE S! PEAK GUST • HIGHES T INSTANTA N[OU $ WINO SP£[0 lA I APP EARS IN IH[ DIRECT ION CO LU"N I . ERRORS WI LL BE CORRECTED AN D NOI EO IN SUBSEQU[Nl PUBLI CATION S . I CERTIFY TH AT THIS I S AN orrl ciAl PUBLICATION or TH f NATIONAL OCEANIC AND ~T"OSPHERIC AO"INISIRATION , AND IS CD "PI LEO rRO" RE CORDS ON r i LE AT THE NATION AL CLI "A I IC DATA C[NI[R, ASHEVILLE, NORTH CAROLINA, 28801 x~..o':)l~ noaa NA TI OHAL OCEAA IC AI() -1110SP!£RIC MINISIRATION HAT IOHAl [NYIROII'[NIAl SAIE LLII(. OAIA AN!J l lf"ORIIATI~ S[RYIC[ NATIONAl CLIMTIC DATA CENI[R ASI£YILU HORIH CAROLINA DIRECTOR NA TIONAL Cli "A IIC DATA CENTER ON S UL N s )ll I c . SU S ITN~ HYDRO L C T I MONTHLY SUMMARY FOR WA TANA WEATHE:< ST ATION DATA TAKEN DUR I NG September , 1 985 RES. RES. AVG. MAX. MAX. DAY'S I'IA)(. 11IH. I"EAH WI I() WINO WI I() GUST GUST pI VAL rt:AH r£lfl Sll...M DAY TEI'f. TErfl. TEI'f . DIR. SPD. SPD. DIR. SPO. DIR. RH ()l PR£CI P Et01;Y DAY DEb c ~G C DEb c DEG 11 "" rvs DEb 1'1/S ' DEb c ,., IWSII1 ------------------------·----------------------------------------------------------------------------1 9.6 6.0 7.8 1}8 .t. 2.9 260 9.7 ESE 99 8.2 7.2 1770 1 2 10 .6 1.9 6.3 277 1.8 2.4 262 6.9 w 97 6.} 0.0 3~0 ~ 2 3 10.9 1.3 6.1 319 .6 1.8 277 7.8 El£ 96 ~.') 0.0 32 6~ } 4 11.1 -1.2 ~.0 006 1.6 2.2 3~4 6.9 N 80 1.6 0.0 360~ 4 ~ n.o .4 6.7 081 1.8 2.3 097 7.4 ESE n. 1.3 0.0 4S70 ~ 6 11.3 3.0 7.2 119 .2 1.2 086 s.s !HI 81 4.1 0.0 206~ 6 7 12.4 4.6 8.') 016 .3 l.'J 091 4.1 !HI 92 7.3 .4 129') 7 9.0 'J.6 7.3 1SO .s 1.9 276 6.9 ESE 99 7.8 9.6 1100 8 9 8.8 1.4 S.1 286 1.2 2.3 227 7.4 w 99 4.9 .8 3610 9 10 8.2 .1 4.2 30S .7 1.3 238 7.8 w 98 3.4 0.0 2306 10 11 8.0 .'J 4.3 01~ .4 1.4 101 S.1 N '19 4.0 .2 276') 11 12 S.1 -.'J 2.3 007 .2 1.1 248 4.6 HE 99 2.0 .2 l'JSO 12 13 9.3 -2.6 3.4 042 .2 1.2 079 3.2 NE 94 2.9 .2 2')2 ') 13 14 8.1 4.7 6.4 071 1.8 2.1 068 9.7 E 99 6.2 23.2 94') 14 1') 7.0 3.4 S.2 273 .7 1.9 248 7.8 NNW 99 S.1 17.2 89U l'J 16 4.0 -2.6 .7 078 3.2 3.3 088 8.7 E 82 -2.3 0.0 37SS 16 17 S.8 -3.8 1.0 082 1.4 1.7 041 4.6 ESE 80 -3.2 0.0 3070 17 18 2.4 -2.9 -.3 073 4.7 4.8 079 10.6 ENE 9') -.7 3.0 100S 18 19 2.8 0.0 1.4 27S .') 1.2 076 '),') WSW 99 1.2 10.4 1060 19 20 1.2 -3.~ -1.2 236 1.0 1.4 2S6 4.1 WSW 99 -.7 .2 14')') 20 21 s.s -4.7 .4 oso 1.1 1.4 0')6 S.5 M 85 -2.7 2.4 312U 21 22 .9 -.6 .2 06') 3.1 3.1 08 1 7.4 ENE 96 -.4 2.0 1050 22 23 2.4 -.3 1.1 047 1.0 1.4 081 6.9 ENE 99 .7 10 .8 90'> 23 24 4.9 .9 2.9 040 1.1 1.7 04') S.1 HE 99 2.8 4.2 10SO 24 2') 3.9 -2.1 .9 062 1.4 2.3 069 6.9 It£ 76 -3.6 0.0 3230 2') 26 3.1 -.9 1.1 070 4.6 4.7 079 10.1 HE 99 .'J 2.6 895 26 27 8.2 3.2 'J.7 OJS 4.6 4.7 080 12.4 8£ 84 2.6 u.o 97S 27 28 'J.3 ,') 2.9 023 .4 .9 067 3.2 WSW 99 1.8 4.4 1100 28 29 7.7 .5 4.1 077 4.3 4.7 085 12.0 E '17 3.7 0.0 1240 29 30 6.2 .5 3.4 274 .6 1.4 247 S.1 WSW 99 3.3 .4 1795 30 ro.TH 13.0 -4.7 3.7 063 1.0 2.2 080 12.4 ENE 92 2.5 99.4 61471 GUST VEL. AT MAX . GU ST MINUS 2 INfERVALS 1U.6 GUST VEL. AT MA X. GUST MINUS 1 INTER VAL 11.0 GUST l...JEL. AI MAX. GU ST PLUS 1 IN TERVAL 1 u. 1 GUS T VEL. AT MAX. GUST PLUS ') INTERVAL~ '7.'2. ... NOTE: RELATIVE HUMIDITY READINGS ARt:: UN~EL1A8LE JHEN w·IND SPt:EDS ARt:: LESS THAN ONE METER PER SECOND. SUCH READINGS HAVE NOT BEEN INCLUOt::O IN THE DAILY OR MONTHLY MEAN FOR RELATIVE HUMIDITY AND DEW POIN T . ** SEE INTERPRET AT ION NOT ES AT END OF Ml.J THLY REPORT ** &. M C NSUL A s? I C. S U SIT NA HY DRO L _c I P O.:J C MONTHLY SUMMARY FOR WATANA WEATHER STATION DATA TAKEN DURING October .• 198? RES. RES. AVG. MAX. MAX . DAY'S MAX . IHH. I'£AH Wltl> Wltl> Wltl> GUST GUST P 'I.W. r£AH I'£AH Sll.AR DAY TErf'. ~. TEI'P . OlR. SPO. SPO. OlR . SPO. OIR . RH OP PREC!P El£RGY DAY oo; c ~GC ~G C oo; rvs MIS oo; rvs " oo; c m IWSIII ----------------------------------------------------------------------------------------------------- 1 ~.0 -1.0 2.0 061 2.0 2.2 064 6.4 E)£ 99 1.7 0.0 1~]1; 1 2 3.0 -.9 1.1 251 .7 1.4 24~ 4.6 WSW 99 1.0 3.0 1160 2 3 3.0 -2.~ .3 290 .6 1.6 232 4.6 WSW 99 .3 2.0 1~0~ 3 4 4.6 -6.2 -.8 327 1.3 1.9 244 4.1 H 90 -3.3 0.0 271~ 4 ~ 4.7 -7.4 -1.4 0~0 1.8 2.2 082 6.0 H 88 -3.7 0.0 219~ ~ 6 2.6 -2 .1 .3 0~0 1.9 2.1 047 ~.1 t£ 94 -.7 0.0 1040 6 7 1.2 -1.6 -.2 083 2.0 2.3 069 8.3 E 99 -.3 2.8 610 7 8 1.8 .1 1.0 0~4 2.0 2.6 08~ 7.4 1£ 99 .6 7.2 71~ 8 9 3.7 -1.4 1.2 3~7 .9 1.1 06~ 2.8 H 99 .6 2.8 1400 9 10 6.0 -4.6 .7 04~ .7 1.5 03. 5.1 E 61 -8.~ .8 1860 10 11 2.8 -3.1 -.2 044 2.9 2.9 040 6.9 1£ 38 -13.0 0.0 1790 11 12 1.6 -~.1 -1.8 036 2.1 '2.3 027 ~.1 HI£ 47 -11.7 0.0 1070 12 13 2.3 -5.8 -1.8 098 1.0 1.5 120 5.1 E 52 -11.0 0.0 1400 13 14 -1.1 -6.6 -3.9 068 2.5 '2.8 060 6.4 E)£ 36 -16.5 0.0 18 4~ 14 1~ -.5 -5.1 -2.8 0~8 2.9 2.9 059 6.0 1£ 48 -12.2 0.0 1005 15 16 1. -6.7 -2.5 053 1.8 2.2 082 5.5 E)£ 54 -1 0.5 0.0 1310 16 17 .1 -7.0 -3.5 060 1.2 1.5 068 ~.5 El£ 48 ~12.~ 0.0 1090 17 18 -2.9 -9.9 -6.4 044 4.1 4.1 0~3 8.3 NE 35 -19.3 0.0 1220 18 19 -5.1 -13.~ -9.3 063 2.3 2.4 054 6.0 1£ 33 -23.2 0.0 15~0 19 20 -9.2 -15.9 -12.6 076 3.4 3.5 074 8.7 El£ 41 -22.6 0.0 1360 20 21 -4.7 -12.3 -8.~ fl77 3.6 3.7 072 6.9 El£ 45 -18.8 0.0 1250 21 22 -5.9 -13.6 -9.8 077 2.7 3.1 035 7.4 ENE H -24.0 0.0 1455 22 23 -7.7 -17.2 -12.5 092 2.6 2.9 122 7.4 ESE 33 -'26.1 0.0 142~ 23 24 -9.9 -21.7 -15.8 076 2.0 2.3 043 6.0 El£ 37 -28.2 0.0 1415 24 25 -13.1 -18.9 -16.0 076 2.8 3.0 048 7.4 ESE 42 -26.1 0.0 1000 25 26 -9.3 -18.9 -14.1 085 3.5 3.7 069 9.2 E 33 -27.5 0.0 1020 26 27 -11.1 -19.~ -15.3 078 4.0 4.1 090 9.7 El£ 36 -26.9 0.0 10 70 '1.7 28 -7.0 -18.0 -12.5 078 .3 3.4 066 8.3 E 40 -23.7 0.0 1210 28 29 -8.0 -18.7 -13.4 087 3.3 3.4 087 8.3 E 41 -24.9 0.0 143~ 29 30 -12.0 -20.4 -ll '2 092 2.4 2.6 087 7.8 E 39 -27.7 0.0 1075 30 31 -14.4 -21.1 -17 8 078 2.2 2.3 094 6.9 E 42 -28.1 0.0 1040 31 IIMH 6.0 -21.7 -6.2 067 2.1 2.6 090 9.7 ENE 56 -14.4 18.6 41810 GUST VEL. AT MAX. GUST MINUS 2 INTERVA LS 8.3 GUST VEL. AT MAX. GUST MINUS 1 INTERVAL 9.2 GUST VEL. AT MAX. GUST PLUS 1 INTERVAL 8.7 GUST VEL. AT MAX. GUST PLUS 2 INTERVALS 8.3 NOTE: RELATIVE HUMIDITY READINGS ARE UN RELIABLE WHEN WIND SPEEDS ARE LE S S THAN ONE METER PER SECOND. SUCH READINGS HAVE NOT BEEN INCLUDED IN THE DAIL Y OR MONTHLY MEAN FOR RELATIVE HUMIDITY AND DEW POINT. ** SEE INTERPRETATION NOTES AT END OF MONTHLY REPORT ** R & M CO N SULTA N TS~ INC. S U SIT NA H YDROELEC RIC PRO~EC MON THL Y S UMMAR Y FOR WATA NA WEATHER STATIO N DATA TAKEN DUR I NG Novemb e r. 1985 RES. RES . AUG. t!AX. MX . DAY'S 11AX. MIN. I'EAH WI I() WI I() WI I() GUST GUST p I ~ I'EAH I'EAH Sll..AR DAY TEI'P. TEI'P. TEI'P . OIR . SPO. SPO . OIR . SPO. OIR . RH OP PRECIP El£RGY DAY ~c ~c IE C DEb tvS MIS ~ IV5 ' DEb c tl1 IWSII1 -----------------------------------------------------------------------------------------------------1 -16.4 -22.8 -19.6 060 .9 1.2 025 4.6 E 45 -28.9 •••• 600 1 2 -12.0 -22.8 -17.4 076 2.1 2.5 084 8.3 EIE 45 -24.7 •••• 940 2 3 -10.4 -20.8 -15.6 077 1.6 1.8 060 6.4 Et£ 43 -26.3 •••• 1250 3 4 -12.2 -22.2 -17.2 071 3.6 3.7 076 9.2 Et£ 43 -26.9 •••• 1070 4 5 -14.3 -22.5 -18.4 101 1.7 1.8 102 3.7 ESE 47 -26.~ •••• 510 5 6 -11.5 -21.6 -16.6 081 1.6 1.7 059 12.8 Et£ 61 -24.0 •••• 755 6 7 -14.1 -24.5 -19.3 094 1.7 1.9 112 6.0 ESE 71 -23 .9 IIIII 000 7 8 -13.0 -22.9 -18.0 082 3.6 3.6 080 8.3 E 61 -23.2 I IIIII 625 8 9 -10.7 -13.9 -12 .3 074 4.3 4.4 073 9.7 EHE 58 -1 9.1 •••• 180 9 10 -6.0 -11.0 -8.5 050 3.2 3.2 043 6.4 HE 85 -10.2 •••• 110 10 11 -3.6 -13.0 -8.3 245 1.1 2.5 249 9.7 w 89 -7.9 •••• 590 11 12 -8.0 -16.1 -12.1 081 1.1 1.5 082 4.6 E 74 -15.5 •••• 260 12 13 -11.0 -21.1 -16.1 084 1.8 2.0 019 6.9 E 68 -20.3 •••• 595 13 14 -15.6 -25.1 -20.4 066 1.0 1.4 087 5.1 HI£ 68 -23 .8 •••• 585 14 15 -15.9 -26.5 -21.2 083 1.6 1.7 072 4.1 E 71 -27 .1 •••• 64 0 15 16 -14.6 -26.2 -20.4 073 3.5 3.5 065 .3 El€ 68 -23 .0 •••• 310 16 17 -13.5 -17.5 -15.5 076 1.4 1.6 082 4.1 E 72 -19.3 •••• 240 17 18 -10.4 -17.8 4.1 083 1.8 1.9 093 6.4 E 80 -1 8 .~ •••• 735 18 19 -8.7 -19.4 -14.1 087 1.5 1.5 111 3.7 E 80 -18.4 •••• 690 19 20 -4.2 -19.0 -11.6 076 2.4 2.5 076 9.2 E 74 -16 .3 •••• 705 20 21 -4.4 -15.9 -10.2 083 3.1 3.2 089 9.2 E 68 -13.7 •••• 271.i 21 22 -10.5 -18.8 -14.7 083 1.6 1.7 071 3.7 E 79 -18.2 •••• 560 22 23 -10.7 -17.0 -13.9 082 1.9 2.0 086 5.1 E 77 -17 .4 •••• 625 23 24 .1 -13.6 -6.8 ~78 3.2 3.3 076 8.3 E 60 -12.9 •••• 320 24 25 -4.3 -12.6 -8.5 071.i 3.6 3.7 071.i 8.7 E 60 -13.9 •••• 280 25 26 -9.1 -13.4 -11.3 080 6.5 6.5 089 12.4 E 70 -15.8 •••• 110 26 27 -9.2 -12 .4 -10.8 062 3.8 3.9 079 8.7 Et£ 74 -14.7 •••• 180 27 28 -12.1 -19.3 -15.7 071 2.8 2.9 075 7.4 Et£ 80 -18.3 •••• 355 28 29 -14.6 -18.2 -16 .4 079 4.4 4.5 074 9.7 Et£ 77 -19.1 •••• 400 29 30 -12.1 -19.7 -15.9 096 2.4 2.4 098 6.4 E 77 -18.4 •••• 55 JO ~TH .1 -26.5 -14.7 077 2.4 2.7 059 12.8 E 68 -19.5 •••• 15550 GUST UEL. AT MAX. GUST MINUS 2 INTERUALS 2.8 GUST lJEL. AT MAX. GUST MINUS 1 INTERUAL 2.8 GUST UEL. AT MAX. GUST PLUS 1 INTERUAL 3.7 GUST UEL. AT MAX. qusT PLUS 2 INTERUALS 2.8 NOTE: RELATIUE HUMIDITY READINGS ARE UNRELIABLE WHEN WINO SPEEDS ARE LESS THA N ONE METER PER SECOND. SUCH READINGS HAUE NOT BEEN INCLUDED IN THE DAILY OR MONTHLY MEAN FOR RELATIUE HUMIDITY AND DEW POINT. ** SEE IN ERPRETATION NOTES AT END OF MONTHLY REPORT ** MONTHLY IN C. R & M CO N S U L A NT S~ S U S ITNA HYDR OE L CT RI C PRO SUMMARY FOR WATANA WE _I< ST AT ION DA TA TAKEN DU R ING Decembe r. 1985 RES . RES. AUG . MAX. MAX. MX. IUH. tEAH Wit() WJI() WI I() GUST GUST P'\Ht. tEAH I£AH DAY TEll'. TEll'. TEtP . DIR. SPO . SPO. OIR . SPO. DIR. RH ~ PRECIP OEG C DEG C DEb c . DEG IVS IVS DEG IVS ' DEG C rt1 CT DAY'S Sll.AR EI£RGY DAY ~ -----------------------------------------------------------------------------------------------------1 -11.6 -21.0 -16.3 on 2.6 2.7 0~8 6.4 Et£ 76 -1 8.4 •••• ~ 1 2 -10.6 -18.1 -14.4 0~ 3.~ 3.6 085 8.3 E ~ -1 7.2 .... 19 ~ 2 3 -1~.1 -22.6 -18.9 087 2.6 2.7 084 7.8 E 76 -22 .~ •••• 200 3 4 -9.7 -22.9 -16.3 087 2.9 3.0 066 9.2 E 74 -20.9 till 6~ 4 5 -11.7 -19.1 -1~.4 067 1.6 1.6 0~7 7.4 Et£ 79 -17.9 •••• 257 ~ 6 -14.7 -20.6 -17.7 ... •••• •••• ••• • ••• E 78 -20.3 • ••• 1 ~5 6 7 -7.4 -17.4 -12.4 ••• •••• •••• • •• •••• E 78 -16.3 tttt 260 7 8 -3.8 -7.6 -5.7 ttl I ttl •••• tit I ttl Et£ 78 -9 .1 till 30 8 9 .1 -3.6 -1.8 tit •••• •••• ••• I ttl Et£ 84 -3.7 I ttl 30 9 10 1.7 -2.2 -.3 ttl •••• •••• Ill lilt Et£ 87 -1.7 lilt 40 10 11 4.8 .3 2.6 ••• •••• •••• • •• •••• E 81 .1 lilt 30 11 12 .4 -9.7 -4.7 Ill till lilt ttl lilt Et£ 91 ;.o lilt 60 12 n -7.1 -12.7 -9.9 ••• •••• IIH • •• •••• Et£ 92 -11.0 •••• 260 13 14 -5.8 -9.5 -7.7 ••• •••• •••• ttl till Et£ 88 -8 .7 •••• 110 14 15 -4.8 -9.2 -7.0 ••• •••• • ••• ••• .... Et£ 89 -9.4 • ••• ~5 15 16 -3.3 -6.9 -5.1 ••• •••• • ••• ttl •••• Et£ 76 -8.8 • ••• 25 16 17 -4.5 -8.5 -6.5 ••• •••• •••• • •• •••• £)£ 91 -7.0 • ••• 25 17 18 -2.6 -9.2 -5 .9 ~·· till tilt ... •••• £)£ 84 -7.8 • •• 0 18 19 1.9 -3.0 -.6 ICI till •••• ••• •••• E 84 -3.5 •••• 30 19 20 3.2 -1.8 .7 Ill lilt lilt Ill •••• £)£ 89 -.7 • ••• 20 20 21 3.5 .8 2.2 ••• •••• •••• • •• •••• E 74 -1.7 till 130 21 22 3.2 -1.2 1.0 Ill •••• lilt ••• •••• E 78 -3.0 • ••• 3~ 22 23 3.2 -.4 1.4 Ill lilt •••• ••• till E 87 -.5 till 15 23 24 3.4 -3.5 -.1 ••• •••• • ••• Ill •••• E 82 -2.2 lilt 0 24 25 -2.5 -10.3 -6.4 ••• •••• I ttl • •• •••• £)£ 82 -9 .5 •••• 70 25 26 -2 .3 -3.6 -3 .0 ttl tttt lilt Ill II II £)£ 63 -8 .9 till 30 26 27 -1.8 -4.6 -3.2 ••• till • ••• ••• •••• t£ 65 -9.0 •••• 35 27 28 -2.7 -7.2 -5.0 ••• I ttl •••• ttl I ttl E 96 -4.6 till 20 28 29 -3.5 -5 .6 -4.6 ••• • ••• lilt • •• •••• £)£ 96 -5.1 lilt 25 29 30 -4.1 -6.7 -5.4 Ill •••• till ••• •••• £)£ 87 -7.1 lilt 20 30 31 -4 .8 -8 .1 -6.5 Ill I ttl I ttl ••• lilt E 87 -8.3 .... 0 31 ~TH 4.8 -22.9 -6 .2 079 2.7 2.8 06 9.2 ENE 82 -8.7 till 2302 GUST VEL. AT MAX . GUST MINUS INTERVALS 7.4 GUST VEL . AT MAX. GUST MINUS 1 INTERVAL 7.8 GUST VEL. AT MAX. GUST PLUS 1 INTERVAL 8.3 GUST VEL. AT MAX. G'i.JST PLUS 2 INTERVALS 7.8 NOTE: RELATIVE HUMIDITY READINGS ARE UNRELIABLE WHEN WIND SPEEDS ARE LESS THAN ONE METER PER SECOND. SUCH READINGS HAV E NOT BEEN INCLUDED IN THE DAILY OR MONTHLY MEAN FOR RELATIVE HUMIDITY AND DEW POINT. ** SEE INTERPRETATION NOTES AT END OF MONTHLY REPORT ** • 13292000 LAT 624604 PI\JVIS10'4AL OATil i).H OCT 1 11j QJ 2 11000 3 10iiOJ 4 1 040G 5 Y850 6 8960 7 8 76\J a 90~0 ~ 't240 1 J 8Q60 11 8~4\J 12 o1oo 13 7 6 50 14 7230 1 5 0 ~00 1 6 &6,Q 1 7 630;j 13 o10J r·~ )d00 20 550 0 £1 5100 22 4~00 23 4700 24 4500 25 4300 26 42G O Z7 410J 28 3QOO 29 3600 50 370J 31 360J TOTAL 214660 MblN 6925 MAX 11300 MIN 3600 CFSM 1.12 I N. 1. 30 AC·FT 425800 ~ o 'I .._ ~ ~ .._ t ... \ I •'I ._ • I ..,# • • o - \ 4 .,. , Susitna Riv•r at Gold Cr••k, AK LONG 1494123 STATE 02 COUNTY 170 PROCESS DATE: 17•JA~·3& 11:24 GL' DATUM OF GAGE: 676.50 FT ~GVD QqAI~AGE AREA: &160 DISCHARGE, IN Cl:SIC FEET PE!l SECOND, WATER YEAR OCTOBE!l 1985 TO SEPTEMBER 1986 MEAN VALUtS ~ov DEC JAN FEB MAR AP MAY JUN JUL AUG s:P 3500 3400 33\JO 3200 5200 3 100 3000 29JO 2900 2800 2:!00 2700 27 00 2000 2o00 2oOJ 2500 250 0 2500 (400 240\J 2400 230J 2300 2!00 2500 2300 23 0 0 2200 2200 8J200 2673 3500 220 0 • 4 3 .48 1 591 00 1529276) LAT 621042 PROVISiOt>IAL DATA DAY OCT 1 32!>00 2 2 9000 3 2940i) 4 25800 5 2340 0 6 214i)i) 7 20 .iCO 8 21700 Q 25 o0 0 1 0 22soJ 11 20600 1 2 1 890!) 13 17600 1 4 1o500 1 5 15400 16 15000 1 7 144 0 J 1 3 137 0 0 l9 1 2 3 :>O 20 12:>00 C:l 11500 22 1100J 2 3 106 00 .:4 1 0 200 23 9800 26 9500 27 ~200 28 6900 29 8600 3 0 S400 31 e2oo TOTAL 514 500 MEAh 16600 MAX 32601.) MIN 8200 CrSM 1. 50 IN . 1 • . AC-FT 1021000 Su sit n a Riv•r at S unshi ne, AK PROCESS OAT£. 17-JAN-86 11:24 GLP LON~ 15010l0 STATE 02 COUNTY 170 DATUM OF GA~E: 270.00 FT NGVO DRAINA GE A~EA: 11100 DISCHARGE, I~ CUBIC FEET PER SECOND, WATER YEAQ OCTOBER 19 3 5 TO SEPTEMBER 1Y86 MEAN VALUES NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SE P 7900 4~i)0 7800 4800 7600 74JO 7200 7000 6800 6700 (>OUU 6500 6400 620 0 6200 6000 6000 5600 5d00 560'J seoo 5600 5400 54:JO 54:>0 5200 5200 5 200 5JOO 5000 4~00 4900 1 82300 6J77 noo 4900 • 55 • 61 361600