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<br />c. Flood bydrograpbs. Hydrographs of the 1973 flood at the
<br />South Platte River gaging stations. for the April, May, Jlme, and
<br />July period are shown on plates 6 to 14.
<br />
<br />d. Flood volumes. Flood volU1lles at the South Platte Ri.ver
<br />gaging stations for selected periods are sUllllll8.rized in table 4.
<br />These data indicate that significEmt increases in flood volume
<br />occurred in the ent ire reach between Waterton and Kersey. The
<br />data also indicatE! that considerallle volume losses were eXI,erienced
<br />downstream from KE!rsey during the flood period.
<br />
<br />Table 4
<br />SOUTH PLATTI~ RIVER
<br />VOLUME SUMMARY,.. 1973 F'LOOD
<br />FOR MONTH OF MAY
<br />
<br />Station
<br />
<br />Waterton
<br />Littleton
<br />Denver
<br />Henderson
<br />Kersey
<br />Weldona
<br />Balzac
<br />Julesburg
<br />North Platte, Nebr.
<br />
<br />Maximum May F'lood Volumes in D.S.F.
<br />I-Day 2-:lli~ 3-Day 5-Day 10-Day 3l-Day
<br />
<br />3,490
<br />66,340
<br />14,000
<br />13,400
<br />23,280
<br />20 , 760
<br />15,850
<br />15,902
<br />17,400
<br />
<br />6,830
<br />10,690
<br />26,300
<br />24,700
<br />41,720
<br />35,990
<br />28,760
<br />28 , 250
<br />30, 500
<br />
<br />10,170
<br />15,170
<br />33,250
<br />33,070
<br />56,000
<br />40,650
<br />1'1,670
<br />39,640
<br />42,l,00
<br />
<br />16,040
<br />23,100
<br />44,890
<br />4"( ,120
<br />82,210
<br />74,810
<br />62,690
<br />61,730
<br />65,100
<br />
<br />13,790
<br />44,440
<br />72,430
<br />80, 300
<br />149 ,6~jO
<br />130,3lI0
<br />111,4"(0
<br />115,200
<br />117,500
<br />
<br />67,975
<br />106,000
<br />149,71.0
<br />174,090
<br />353,360
<br />286,970
<br />257,360
<br />256,440
<br />232,980
<br />
<br />e. Volume l,?sses. The d,ata shown in table 4 indicatE! that
<br />significant volume losses were E~xperienced during May on the South
<br />Platte River from Kersey downstream to the mouth. These losses
<br />continued through the months of J'une and July. Discussion with
<br />officials of the State of COlorad,o :lndicated that irrigation
<br />diversions accounted for the ma:lor portion of these losses. Infor-
<br />mation furnished by the State indicates that there are 23 cliversion
<br />ditches located between Kersey ELnd Balzac and that most of them
<br />were diverting flows throughout the May-;ruly period. A cOI"p'-rison
<br />of IOOnthly flows for May, June, and July, y:e.ssing the South Platte
<br />River gaging stations from KersE!y to the mouth of the river, is
<br />presented in table 5. The flow losses to the South Platte River
<br />were probably lar!~er than are indicated :from the values given in
<br />the table since data concerning tributary inflow between KI~rsey
<br />and North Platte are not availal)le; the volume coming from these
<br />tributaries has not been considered in the volume loss values
<br />shown in table 5.
<br />
<br />21
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