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Possible actions?

Possible actions?. Purpose: To feed the models with potential actions for the lake, to investigate: THE PHYSICAL CHANGES (i.e. velocity patterns or retention time or water level) THE CHEMICAL OR BIOLOGICAL CHANGES (i.e. water quality – TN, TP, DO)

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Possible actions?

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  1. Possible actions? • Purpose: • To feed the models with potential actions for the lake, to investigate: • THE PHYSICAL CHANGES (i.e. velocity patterns or retention time or water level) • THE CHEMICAL OR BIOLOGICAL CHANGES (i.e. water quality – TN, TP, DO) • Actions – those on slides from suggestions/plans/or proposals presented in studies mentioned at meeting: • Development (economic or other): • Urban development • Waste water treatment works development • Ecosystem recuperation: • GEF • IAP group

  2. Potential actions? • Actions to change flow in the lake • Actions to change land area or depth of the lake • Actions to change nutrients

  3. Format?

  4. Changes to flow? • Potential actions (only suggestions) • Re-direct flow from Omoum Drain to Quala Drain (X%) • Re-direct flow from Quala Drain to Umum (convert SEB to a wetland i.e constructed wetland for water cleaning) • Transfer from Lake valley to north west basin • Transfer from Omoum pumping station to South East Basin • Increase Nobaria Canal inflow () • Remove E&W WWTP flows from basins • Accurate management/control of hydraulics within the lake basins (daily) – allow variable water surface & flushing/pumping? • Priority basins – choosing of • Sea water flow into basin • Nobaria west drain to the basin 400000m3/day • Others?

  5. Changes to Lake Area and/or Depth • Potential actions (only suggestions) • Insert islands in the lake (where? how many?) • Change lake boundary – areas of fill/expand (where? how much?- i.e. assume all proposed projects go ahead?) • Dredging (extraction of contaminants/nutrients? Where by how much?) • Increase water level height in SEB – close basin (area of lake) • Change vegetation cover to islands (land) (60-30%) • Others?

  6. Changes to Nutrients? • Potential actions (only suggestions) • Use of constructed wetlands (in Quala Drain and Unoum or somewhere?) • Change to vegetation management (how – increase or decrease cutting or changing species? by how much?) • Improvement to West and East or other WWTP • Removal of WWTP outputs from system completely • Agricultural control of pesticides • Reduction to phosphates addition to detergent • Control of industrial emissions of nutrients to lake (by how much?) • Biomanipulation – introduction of different fish species • Introduce aeration of lake or drains • Others?

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