Digital Signal Processing Reference
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Figure (5-29a): Comparison of TN average conc. measurements between upstream
and downstream measuring locations in the catchment
Figure (5-29b): Comparison of TSS average concentration measurements between upstream
and downstream measuring locations in the catchment
The interpretation of the catchment condition shows high rates of nutrients leached from the catchment
through drainage water into the main drainage system. These nutrients accumulate in the direction of
flow until the entrance to the lake. At the downstream zone the nutrients also come from the
surrounding fish farms around the lake boundaries. It is expected that the level of nutrients in the lake
increases due to all these input sources, and this is shown in the modelling part of the main water
quality indicators of chapter 7. It has to be mentioned that it was not possible to find any available
historical data sets for Lake Edko to be used as base line for investigation of both hydrodynamics and
water quality of the lake. For basic general water quality parameters concentrations in the lake, there
were two published papers (Shakweer, 2005) and (Shakweer 2006) through the Oceanography and
Fisheries Institute in Alexandria. The papers showed general concentrations of parameters and
seasonal variations through site investigations in lake different zones, but also with no historical
referenced data. For water quality modelling in shallow lakes it is very important to have historical
geographically referenced data sets for the analysis of spatial and temporal variations of parameters
concentrations. Therefore it is not only important to monitor the catchment locations but to have fixed
monitoring locations for both hydrodynamic and water quality parameters within the lake area.
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