State of the Bay Report 2011-Final.pdf - Anchor Environmental

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State of Saldanha Bay & Langebaan Lagoon 2011 List of Figures Figure 4.14. Figure 4.15. Figure 4.16. Figure 4.17. Figure 4.18. Figure 4.19. Figure 4.20. Figure 4.21. Figure 4.22. Figure 4.23. Figure 4.24. Figure 4.25. Monthly trends in the volume of effluent released from the Saldanha WWTW, Apr 2003-December 2011, and authorised total volume per year expressed as a daily limit (red line). Allowable discharge limits as specified in terms of the exemption issued by DWAF under the National Water Act 1998 are represented by the dashed red line. ..................................................................................................................... 39 Monthly trends in the numbers of Faecal Coliforms in effluent released from the Saldanha WWTW, April 2003 - December 2011. Allowable limits as specified in terms of a General Authorisation under the National Water Act 1998 are represented by the dashed red line. ........................................................................ 39 Monthly trends in the numbers of Total Suspended Solids in effluent released from the Saldanha WWTW, April 2003 - December 2011. Allowable limits as specified in terms of a General Authorisation under the National Water Act 1998 are represented by the dashed red line. ........................................................................ 40 Monthly trends in the numbers of Chemical Oxygen Demand in effluent released from the Saldanha WWTW, April 2003 - December 2011. Allowable limits as specified in terms of a General Authorisation under the National Water Act 1998 are represented by the red line. ............................................................................... 40 Monthly trends in Ammonia Nitrogen for effluent released from the Saldanha WWTW Apr 2003-December 2011. Allowable limits as specified in terms of a General Authorisation under the National Water Act 1998 are represented by the red line. ..................................................................................................................... 41 Monthly trends in Nitrate Nitrogen for effluent released from the Saldanha WWTW Apr 2003 - December 2011. Allowable limits as specified in terms of a General Authorisation under the National Water Act 1998 are represented by the red line. .. 41 Monthly trends in water quality parameters Orthophosphate for effluent released from the Saldanha WWTW Apr 2003-December 2011. Allowable limits as specified in terms of a General Authorisation under the National Water Act 1998 are represented by the red line. ..................................................................................... 42 Monthly trends in Free Active Chlorine for effluent released from the Saldanha WWTW Apr 2003-December 2011. Allowable limits as specified in terms of a General Authorisation under the National Water Act 1998 are represented by the red line. ..................................................................................................................... 42 Monthly trends in the daily volume of effluent discharged from the Langebaan WWTW in the period June 2009-November 2011. .................................................. 43 Monthly trends in the numbers of Faecal Coliforms in effluent released from the Langebaan WWTW, June 2009 - December 2011. Allowable limits as specified in terms of a General Authorisation under the National Water Act 1998 are represented by the red line. ..................................................................................... 43 Monthly trends in Total Suspended Solids in effluent released from the Langebaan WWTW, June 2009 - December 2011. Allowable limits as specified in terms of a General Authorisation under the National Water Act 1998 are represented by the red line. ..................................................................................................................... 44 Monthly trends in Chemical Oxygen Demand in effluent released from the Langebaan WWTW, June 2009-February 2011. Allowable limits as specified in terms of a General Authorisation under the National Water Act 1998 are represented by the red line. ..................................................................................... 44 vi ANCHOR e n v i r o n m en t a l
State of Saldanha Bay & Langebaan Lagoon 2011 List of Figures Figure 4.26. Figure 4.27. Figure 4.28. Figure 4.29. Figure 4.30. Figure 4.31. Figure 4.32. Figure 4.33. Monthly trends in the concentration of Ammonia Nitrate in effluent from Langebaan WWTW, June 2009 - December 2011. Allowable limits as specified in terms of a General Authorisation under the National Water Act 1998 are represented by the red line. ..................................................................................... 45 Monthly trends in the concentration of Nitrate Nitrogen in effluent from Langebaan WWTW, June 2009 - December 2011. Allowable limits as specified in terms of a General Authorisation under the National Water Act 1998 are represented by the red line. ..................................................................................... 45 Monthly trends in the concentration of Orthophosphate in effluent from Langebaan WWTW, June 2009 - December 2011. Allowable limits as specified in terms of a General Authorisation under the National Water Act 1998 are represented by the red line. ..................................................................................... 46 Monthly trends in the concentration of Free Active Chlorine in effluent from Langebaan WWTW, June 2009 - December 2011. Allowable limits as specified in terms of a General Authorisation under the National Water Act 1998 are represented by the red line. ..................................................................................... 46 Spatial extent of residential and industrial areas surrounding Saldanha Bay and Langebaan Lagoon from which storm water runoff is likely to enter the sea (areas outlined in white). Note that runoff from the Port of Saldanha and ore terminal have been excluded as it is now reportedly all diverted to storm water evaporation ponds. ....................................................................................................................... 48 Location of seawater intakes and discharges for seafood processing in Saldanha Bay together with location of current and proposed mariculture operations ......... 50 Total monthly discharge of fresh fish processing effluent (FFP) disposed to sea by Sea Harvest from January 2001 to March 2007. ...................................................... 53 Monthly trends in the numbers of Faecal coliforms in effluent from the Sea Harvest fresh fish processing effluent (FFP) discharged into Small Bay in the period Feb 201 to Dec 2011. .............................................................................................................. 54 Figure 4.34. Allocated mariculture concession areas in Saldanha Bay 2010. .............................. 56 Figure 4.35. Overall annual mussel productivity (tons) in Saldanha Bay between 2000 and 2010 (source: DAFF 2011) .................................................................................................. 56 Figure 5.1. Figure 5.2. Figure 5.3. Figure 5.4. Schematic representation of the surface currents and circulation of Saldanha Bay (A) prior to the harbour development (Pre-1973) and (B) after construction of the causeway and iron-ore terminal (Present). (Adapted from Shannon and Stander 1977 and Weeks et al. 1991a) .................................................................................. 58 Faecal coliform and E. coli counts at 4 of the 10 sampling stations within Small Bay (Feb 1999-Feb 2012). A downward slope of the regression (solid red and blue lines) is indicative of improving water quality, while an upward slope in these lines in indicative of decreasing water quality. ................................................................. 66 Faecal coliform and E. coli logarithmic counts at 3 of the 10 sampling stations within Small Bay (Feb 1999-Feb 2012). A downward slope of the regression (solid red and blue lines) is indicative of improving water quality, while an upward slope in these lines in indicative of decreasing water quality............................................ 67 Faecal coliform and E. coli logarithmic counts at 4 of the 10 sampling stations within Big Bay (Feb 1999-Feb 2012). A downward slope of the regression (solid red vii ANCHOR e n v i r o n m en t a l
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Beach Width (m) State of Saldanha B
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No. saltmarsh patches Saltmarsh are
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Top 10 species contributing to simi
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Afrolittorina knysnaensis (no/0.5 m
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Similarity Iron Ore Jetty Iron Ore
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Lynch Point State of Saldanha Bay &
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Number of species State of Saldanha
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Number of birds 1976 1977 1978 1979
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