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<br />- ..~, .......--. <br /> <br />..,~:-- .-S.' :.."~/;,~- _ ~';,N <br /> <br />VII -22 <br /> <br />H. Sensitivity of Dissolved Oxygen Model <br /> <br />Realizing reaeration (KA) and deoxygenation (Ko) rates have <br /> <br /> <br />been used in the dissolved oxygen model which could be questioned <br /> <br />due to lack of data for high mountain streams, other reaction rates <br /> <br /> <br />have been used in the model to determine the effect on the waste <br /> <br />load allocations. Several reaction rates have been used in the <br /> <br />model, however the Colorado Department of Health has requested the <br /> <br /> <br />followin9 rates: KA = 5.0 and Ko = 0.5. <br /> <br />To demonstrate the degree of sensitivity of the model, the <br /> <br /> <br />model was calculated for the conditions Occurring in the 1974 sum- <br /> <br />of the model using the different reaction rates are presented in <br /> <br />mer flows using the above mentioned reaction rates. The results <br /> <br />Figure VII-J where it can be compared with the model used in the <br /> <br /> <br />plan. As shown in Figure VII-J, the model using the different <br /> <br />reaction rates predi cts a hi gher di sso I ved oxygen I eve I in the ri ver <br /> <br />below Alamosa. It does not appear to fit the verification data in <br /> <br /> <br />that area as well as the model originally presented in the plan. <br /> <br />it indicates that higher waste load allocations would be allowed <br /> <br />When the model is used to determine waste load allocations, <br /> <br />'-', <br /> <br />for Monte Vista and Alamosa during the seven day, ten year low flow. <br />However, these higher allocations are very low when compared to the <br /> <br />r, ~ r,',~ "\ <br />L ,-' (,;'1:-.) <br />