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<br /> <br />'.~ >, <br />'~".~; <br /> <br />~ <br /> <br />" <br /> <br />'. <br />I <br /> <br />"'2"'-r~':~-'> -,j'.",- ';" <br /> <br />V II-9 <br /> <br />the nightly dissolved oxygen values by use of the nightly background <br />dissolved oxygen deficit. <br /> <br />c. Verification of Model <br /> <br />The Rio Grande was modeled using the actual flow data for the <br /> <br /> <br />summer and late fall of 1974 and the model was compared with the <br /> <br /> <br />dissolved oxygen data collected during this same period. The dis- <br /> <br />solved oXygen data used for verification was obtained during the <br /> <br />night at different points along the Rio Grande. The verification <br /> <br /> <br />data is presented in Table VII-D. Dissolved oxygen values for both <br /> <br />daytime and nighttime are presented to demonstrate the diurnal var- <br /> <br />iation. <br /> <br />There are four parameters that change the results of the water <br /> <br /> <br />quality model. These parameters are: (1) river flow, (2) river <br /> <br /> <br />water temperature, (3) treatment plant effluent quantity, and (4) <br /> <br /> <br />treatment plant effluent quality. In the nightly verification data <br /> <br /> <br />presented in Table VII-D, the parameters, for practical purposes, <br /> <br /> <br />are the same for the data gathered on 6/14/74, 6/28/74, and 816174. <br /> <br /> <br />This is also the case with the data gathered on 11111/74 and 11/12/74. <br /> <br />As there are only two basic conditions, only two water quality models <br /> <br /> <br />have been computed for use in verification of the model. The two <br /> <br />models are presented in Figures VII-J and VII-K and superimposed are <br /> <br />the verification data for the conditions of each model. <br /> <br />- - <br />i <br />,~ , <br /> <br />(1. ..... <br />c"u <br /> <br />j <br />