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| Water Balance: Irrigation return
flow was between 50 and 13% of irrigation diversions from May 22 to Sept.
10, 2005, with a total of 810 mm (over 82,000 ha) diverted and 170 mm (21%)
returned. |
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| TSS Balance: Flow-weighted
average TSS concentrations in return-flows were generally greater than the
diverted irrigation water. However, because return-flow volume was less
than the volume diverted for irrigation, there were periods where TSS load
returned to the Snake River was less than TSS load diverted. From May 22
to Sept. 10, 2005, the cumulative TSS load returned to the Snake river was
equal to that diverted, but average TSS concentration in return-flow increased
from 29 to 140 mg L-1 compared to diverted water. |
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| Dissolved P: Dissolved P (DP) concentration
in irrigation return flow was greater than irrigation water at the start
of the season, but by August, concentrations were equal. This is due to
the increased DP in irrigation water, possibly resulting from up-stream
irrigation returns. |
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