soft sediments, soil, debris and other material may release pollutants back into surface waters, groundwater or coastal waters. If the excavated material would contain sediments contaminated with heavy metals, it would have to be appropriately handled and disposed in order to avoid any potential environmental and health risks to the residents and downstream marine ecosystems. Pollution within the is mainly caused by sewage disposal, as such, occurrence of heavy metals at concentrations that will affect aquatic biota or people living in the area is not expected. However, sediment sample analysis at selected locations will need to be done. 7 Will the project cause localized flooding and Low poor drainage during construction Annexures 4 a to 4 c indicate that the present canal Is the project area located in a flooding sections are adequate to withstand 5- and 10-year location? design return period peak discharges under existing land use conditions. However, some low-lying embankment sections will be subject to overtopping and undergo flooding under 10-year design return period peak flow discharge and future (2025) land use conditions, presumably due to partial blockage to the flow at some bridge locations with improperly aligned cross drainage openings and
soft sediments, soil, debris and other material may release pollutants back into surface waters, groundwater or coastal waters. If the excavated material would contain sediments contaminated with heavy metals, it would have to be appropriately handled and disposed in order to avoid any potential environmental and health risks to the residents and downstream marine ecosystems. Pollution within the is mainly caused by sewage disposal, as such, occurrence of heavy metals at concentrations that will affect aquatic biota or people living in the area is not expected. However, sediment sample analysis at selected locations will need to be done. 7 Will the project cause localized flooding and poor drainage during construction Is the project area located in a flooding location? Low Annexures 4 a to 4 c indicate that the present canal sections are adequate to withstand 5- and 10-year design return period peak discharges under existing land use conditions. However, some low-lying embankment sections will be subject to overtopping and undergo flooding under 10-year design return period peak flow discharge and future (2025) land use conditions, presumably due to partial blockage to the flow at some bridge locations with improperly aligned cross drainage openings and
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