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<br />Water
<br />year
<br />
<br />Maximum 'Weighted average
<br />Median concentration
<br />Median flow year
<br />Maximum flow year
<br />Minimum wei ted avera e
<br />
<br />1934
<br />1956
<br />1936
<br />1929
<br />1
<br />
<br />tl
<br />
<br />
<br />Maximum weighted average
<br />Maximum level Lake Mead
<br />Median concentration
<br />Minimum. weighted average
<br />Most recent
<br />
<br />1956
<br />1941
<br />19411
<br />1950
<br />1965
<br />
<br />Table A--Selected annual weioldlted. averall:e anal.ys~s--Colorado River
<br />(Data in parts per million unless otherwise indicated)
<br />
<br />Water Mag- Po~
<br />discharge Cal- new tad- Bicar- Chlo" Fluo"
<br />(acre- Silica Iron cium. sium Sodium sium bonate Sulfate ride ride
<br />feet) (5io,,) (Fe) (Ce) (Mo) (Ne) (,) (HCO,) (S04) (el) (F)
<br />
<br />Colorado River at Grand Ca on-- eriod unaffected ler e u stream reservoirs
<br />4,656,000 15 105 39 159 .1 20 392 13
<br />8,860,000 15 82 25 85 5.1 201 215 78
<br />12,320,000 16 83 23 79 6.0 186 228 61
<br />lSl,430,000 18 74 23 73 6.2 164 229 48
<br />1 00 000 16 1 60 4. 184 168 4
<br />Colorado River at Grand on-- eriod affected stor e in Iake P01.'e11 1
<br />2,742,000 15 11 3 171 .5 23 39 153 o.
<br />2,721,000 14 115 35 110 1.0 219 399 149 .5
<br />10 0 000 12 8 24 .0 1 2 1 6
<br />Colorado River belov Hoover Dam 1 1-
<br />104 32 117 5.3 170 350
<br />110 28 98 6.4 153 355
<br />92 28 . ,90 5.9 159 299
<br />84 26 J; 81 158 257
<br />101 29 115 5.4 156 ~~5
<br />Colorado River flow reachiWl: ImPerial Dem
<br />106 34 137 5.6 173 375
<br />110 28 106 5.5 153 363
<br />92 28 98 4.1 165 306
<br />84 27 88 2.9 163 205
<br />104 110 168 64
<br />
<br />7,818,000
<br />11,130,000
<br />14,450,000
<br />12,940,000
<br />7.917.000
<br />
<br />103
<br />79
<br />70
<br />66
<br />108
<br />
<br />13
<br />11
<br />12
<br />11
<br />10
<br />
<br />1956 6,323,000
<br />1941 11,060,000
<br />1944 13,240,000
<br />1950 11,500,000
<br />1 66000
<br />SodiUlll. plus potassium reported as sod1Ul1l..
<br />
<br />15
<br />12
<br />11
<br />13
<br />16
<br />
<br />126
<br />87
<br />76
<br />75
<br />142
<br />
<br />1
<br />
<br />0.5
<br />.3
<br />
<br />Ni-
<br />trate
<br />(NO,)
<br />1 26-62
<br />5.1
<br />3.9
<br />2.4
<br />2:5
<br />2.
<br />
<br />Dissolved solids
<br />(residue at
<br />1800 C.)
<br />Tons per
<br />a"""-
<br />(p.p.m.) foot
<br />
<br />960 1.31
<br />600 . 82
<br />591 .80
<br />555 .75
<br />486 .66
<br />
<br />.3
<br />5.5
<br />2.
<br />
<br />1,050 1.43
<br />1,030 1.40
<br />62 .8
<br />
<br />837 1. 14
<br />766 1.04
<br />679 .92
<br />606 .82
<br />814 1.11
<br />
<br />917 1.25
<br />788 1.07
<br />699 .95
<br />637 .87
<br />12 1.24
<br />
<br />seeo
<br />
<br />Hardness
<br />as CaC03
<br />Cal-
<br />cium,
<br />magne-,.
<br />,,,.,
<br />
<br />Non-
<br />carbon-
<br />ate
<br />
<br />422 254
<br />308 143
<br />302 149
<br />279 144
<br />26 114
<br />
<br />41l.0 248
<br />431 252
<br />06 162
<br />
<br />391 252
<br />390 264
<br />3411 214
<br />316 187
<br />371 24~
<br />
<br />404 262
<br />390 264
<br />3411 210
<br />320 187
<br />8 24
<br />
<br />Specific
<br />conduct-
<br />=ce
<br />(micro-
<br />mhoe
<br />at 250 c.)
<br />
<br />1,460
<br />927
<br />901
<br />848
<br />46
<br />
<br />1,570
<br />1,540
<br />
<br />1,230
<br />1,140
<br />1,030
<br />927
<br />1.210
<br />
<br />1,340
<br />1,200
<br />1,070
<br />985
<br />1 80
<br />
<br />
<br />0.3
<br />.3
<br />.4
<br />
<br />.4
<br />
<br />0.4
<br />.3
<br />.3
<br />.3
<br />.4
<br />
<br />3.7
<br />3.0
<br />3.4
<br />1.9
<br />1.6
<br />
<br />1.7
<br />2.5
<br />2.5
<br />1.4
<br />1.1
<br />
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