Stormwater Pollution in the Botany Bay Catchment

As part of the BBCCI the extent of stormwater pollution entering into Botany Bay and its estuaries has been modelled using E2. This information will be used to provide input data for the Ecological Response Model being developed for the Bay and its estuaries. It covers a broad range of stormwater pollutants .
The report was completed in October 2007 and can be downloaded below.

Click here to download the Botany Bay E2 Pollutant Load Modelling Report, October 2007 (3.3 Meg!)

Some additional modelling has been done, again using E2, to breakdown the mean annual loads from the October 2007 report, based on council areas with in the Botany Bay catchment. This report contains a detailed breakdown of the pollutant loads being produced by each council. This report was completed in January 2008 and it can be downloaded below.

Click here to download the E2 Council Pollutant Loads Modelling Report, February 2008 (1.4 Meg!)

We have also used the E2 model to look at the likely changes in pollutant loads due to landuse changes in 2030 and 2070. Some of the pollutants will increase by significant amounts if water quality improvement measures are not put in place. The modelling also looked at the reductions in certain pollutants (TSS, TN and TP) to could be achieved by implementing water sensitive urban design (WSUD). The report was completed in May 2008 and it can be downloaded below.

Click here to download the E2 Modelling Report on Predicted Future Landuse Changes 2030 & 2070, May 2008 (2.7 Meg!)

In addition to modelling the catchment pollutant loads UNSW were engaged to complete an Environmental Assessment of Botany Bay. This study is based on samples taken from 84 sites around Botany Bay several years ago that had been analysed for sediment type and geochemistry, but no research had been done on the benthic foraminifera in the samples. The report covers sediments, sediment geochemistry and forminifera (which can be used as long-term ecological monitoring indicators). The report displays the results on a series of maps of the Bay. The report was completed in May 2008 and it can be downloaded below.

Click here to download the Environmental Assessment of Botany Bay, May 2008 (4.8 Meg!)

The following table and graph are extracts from the October 2007 final reoport, which can be downloaded above.
The table below shows the pre-urbanisation and current load differences for common stormwater pollutants in the Botany Bay catchment.

* TSS= Total Suspended Solids, TOC= Total Organic Carbon, TN= Total Nitrogen,
TP= Total Phosphorous, BOD= Biochemical Oxygen Demand, FC= Faecal Coliforms

The graph below shows the mean annual contributions of suspended solids from the major sources in the Botany Bay catchment (note the Prospect Creek figures are alreay included in the Georges River total).