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<br /> <br /> DISTANCE FROM MOUTH. IN KILllMETEIlS 0 <br /> <::> <br /> 310 300 2110 280 %TO 260 2$0 ~ <br /> 0.50 <:.J1 <br /> C'1 <br /> -- <br /> c; <br /> I'M-II SITE NUMBER <br /> cc: <br /> w I MAXIMUM OBSERVED <br /> .... <br /> :; CON CENTRA nON <br /> cc: 0.'10 <br /> w AVERAGE OBSERVED <br /> "- <br /> (I) CONCENTRATION <br /> :;; <br /> <I: <br /> cc: <br /> '" MINIMUM OBSERVED <br /> ::; CONCENTRATION <br /> == <br /> :;; 0.30 <br /> z + ONE SAMPLE OR NO <br /> VM-3 VARIATION <br /> z I <br /> 0 <br /> ;:; COMPUTED BV PIONEER-I <br /> <I: MODEL <br />VJ cc: <br />.... <br />..,. z <br /> w ---- COMPUTED BV <br /> () <br /> z 0.20 U.S. GEOLOGICAL <br /> 0 SURVEY MODEL <br /> () <br /> w <br /> .... VM-6 <br /> <I: YM-4 <br /> J: YM-2 <br /> "- <br /> (I) VM-1 -.... VM- <br /> 0 '- --I <br /> J: VM-5 <br /> "- <br /> 0 0.10 J I <br /> J: <br /> .... Ll ~ " <br /> cc: <br /> 0 <br /> VM-Il1 ~I -:;1~--'- vM:fl---:=~2--Y;:~3-1 <br /> + <br /> 0.00 ' + <br /> 195 190 185 180 175 170 116 180 156 <br /> DISTANCE FROM MOUTH. IN MILES <br /> <br />Figure 20.--Computed versus observed concentrations of orthophosphate in the Yampa River, <br />September 23-24, 1975 (U.S. Geological Survey and Pioneer-l ,models). <br /> <br />