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<br />RIO GRANDE AT SAN MARCIAL, N. MEX.
<br />
<br />LOCATION _ Two water-stage recorders. lat. 33 degrees 41 min., long. 106 degrees 58
<br />min., at Atchison. Topeka and Santa Fe Railway bridge in Pedro Armendaris grant
<br />34. 1.1 miles downstream from San Marcial. Socorro County. One recorder on down-
<br />stream end of south abutment of bridge, zero of gage 4.459.08 feet above mean sea
<br />level; the other recorder on upstream end of first bridge pier from south abutment of
<br />bridge. zero of gage 4.455.38 feet above mean sea level.
<br />
<br />DRAINAGE AREA _ 27.700 square miles (including 2,940 square miles in closed basin in
<br />northern part of San Luis Valley, Colo.)
<br />
<br />RECORDS A V AIIABLE _n January 1895 to December 1941 in reports of Geological Sur-
<br />vey. January 1895 to December 1931 in reports of State Engineer. January 1931 to
<br />December 1941 in reports of International Boundary Commission. January 1941 to
<br />December 1941 in report of Rio Grande Compact Commission. Records prior to Jan-
<br />uary 1922 at site 0,3 mile upstream; those for January 1922 to February 1932 at site
<br />at highway bridge half a mile northeast of San Marcial and 1.8 miles upstream from
<br />present site.
<br />
<br />EXTREMES _ Maximum discharge during year. 24.600 second-feet May 17 (gage height.
<br />. 9.73 feet); minimum daily discharge. 154 second-feet Sept. 16.
<br />1895-1941: Maximum discharge about 50.000 second-feet Oct. 11.1904; no flow at times.
<br />
<br />REMARKS: Records good. Recorder moved from site at upstream end of first bridge
<br />pier from south abutment to site at downstream end of south abutment on May 17;
<br />returned to former site on June 19. Diversions for irrigation above station.
<br />
<br />__.__n__"_ .----....
<br /> Discharge, in second-feet, calendar year 1941
<br />Day Jan. Feb. Mar. Apr. May June July Aug. Sept. Oct. Nov. Dec.
<br />1 793 877 1.330 2.150 4.200 18,100 9,630 868 1.240 5,280 4,430 1.600
<br />2 823 979 1,130 2.250 5,020 16.900 8.510 727 1.870 3.280 4.250, 1.670
<br />3 856 842 987 2,160 6.260 15,200 7.540 623 1.110 2,370 4,420 1.560
<br />4 890 831 974 2.300 7,910 13,500 6.790 593 977 3.320 4.310 1.640
<br />5 939 762 971 2.200 9.630 13.500 6,030 523 698 6.110 4.070 1,640
<br />6 852 881 1,040 1.950 12,800 13.200 5.510 461 566 4.260 4,030 1,740
<br />7 818 1.650 1,110 2,040 13.300 12.400 5.550 396 587 2.520 4.000 2,000
<br />8 749 1.520 1.080 2,530 11.700 12,500 4.870 416 489 1.850 3,700 1.780
<br />9 598 1,320 1.170 2.280 12.300 12,300 4.570 554 325 1.900 3.440 1.680
<br />10 652 1.210 1,280 1,620 14,300 12.400 4.360 1.320 321 1,940 3.200 1,560
<br />11 707 1.160 1,280 1,520 15.300 13.000 4.360 2.110 346 2.360 2.600 1.630
<br />12 766 1.060 1,220 1.600 16.300 12,000 4,210 3.190 244 2.590 2.370 1,870
<br />13 803 1,080 923 1.990 17.500 11.200 4.180 1.990 200 2.600 2.220 1.820
<br />14 747 1,110 898 2.170 17.500 9,800 4.830 2,250 178 2,710 2.390 1.730
<br />15 780 1,120 1.000 2.110 18.000 8.730 3.650 2.540 159 2,640 2.420 1,770
<br />16 851 1,120 1,080 2.250 21,300 7,630 3.290 1,920 154 3.640 2.500 1,750
<br />17 777 1,070 1,260 2.150 23,900 7.050 3.470 1.820 324 3.630 2,560 1,720
<br />18 781 953 1.100 '1,850 23.200 6,490 2.900 1.380 496 3.130 2.580 1.600
<br />19 795 1.110 1.300 1.980 22,300 6,010 2.820 1.600 570 3,350 2.550 1.590
<br />20 729 1.180 1.410 2.360 21.300 5,500 2.760 1.420 853 3,490 2.680 1,540
<br />21 681 1.380 1.490 2.430 23.400 5.560 3.450 1,170 1,230 3.390 2,700 1,520
<br />22 646 1,530 1.690 2.340 23.000 5,630 3.450 963 2,070 3.200 2.540 1.460
<br />23 646 1.530 1.930 1.930 21.600 6,350 2.600 1.310 3,360 3.510 2.420 1.410
<br />24 644 1,560 1,700 1,780 20.100 7.300 2.530 1.440 4,940 3.910 2.420. 1.410
<br />25 701 1,480 2,280 1.940 20.100 8,020 2.190 1,540 4,680 3.950 2,340 1,450
<br />26 697 1,620 2,350 1.970 17;500 8.750 1,940 951 1.550 7.120 2,180 1,250
<br />27 752 1.500 2,450 2,290 16,500 9,810 1,880 756 1.080 6.010 1.920 1.200
<br />28 795 1,320 2.850 2,640 13.100 9.680 1,850 472 1.320 4.020 1,580 1,150
<br />29 939 2,550 3.130 16.400 9.270 1,960 356 3.540 3.620 1.640 1.040
<br />30 913 2.310 3.240 17,000 9,170 1.470 1.570 6,760 3,850 1.680 1.090
<br />31 841 2,080 18.200 990 1.470 5.670 1.200
<br />-,,-----_.. .---- . _..____~____.~_~______ _.__n
<br /> Second- Run-off in
<br /> Month foot-days Maximum Minimum Mean acre-feet
<br />January __ .__.__........__........'.... ... .__..... ___..........~..__ 23.961 939 598 773 47.500
<br />February ..__....__.....__...______...__.....__.___.~.__...__...... 33.755 1,650 762 1.210 67.000
<br />March .... .................__.............~___.__.. ............. ..__.. 46,223 2.850 898 1.490 91.700
<br />April ......' ......n..........___..._......__ "__,,,___"n' ............ 65.150 3.240 1,520 2,170 129.000
<br />May ........... __....00...............__...__ .......___ ,......... .00____500.920 23,900 4.200 16.200 994.000
<br />June n. .___00__.. n....................__n.n....__n.......n..n___ ,306.950 18.100 5.500 10,200 609,000
<br />July . __..........___~.........._.....__n....n.......___..............124.140 9.630 990 4.000 246.000
<br />August ____...00___................_......_...._'....'.... ...... 38.699 3,190 356 1,250 76.800
<br />September .'.n................,.....____...__'........."....... 42,237 6.760 154 1.410 83,800
<br />October ......00................._............_.....__00.00.........111.220 7.120 1,850 3.590 221.000
<br />November ,................_00..... "..__.....................00. 86.140 4,430 1.580 2.870 171.000
<br />December ....................__00........--....--.......--......... 48.070 2.000 1,040 1.550 95.300
<br />Year .. .............__.........~..... .....__.............001.427 .465 23,900 154 3,911 2,832.100
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