Presentation on theme: "Possible actions? Purpose: –To feed the models with potential actions for the lake, to investigate: THE PHYSICAL CHANGES (i.e. velocity patterns or retention."— Presentation transcript:
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
Potential actions? Actions to change flow in the lake Actions to change land area or depth of the lake Actions to change nutrients
Format? Action AAction BAction C Flow changes Lake area or depth Nutrient input
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?
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?
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?