Beachbuoy data This document provides you with more information about individual bathing waters and recreational harbours. It also defines the process behind which we determine why particular outfalls affect individual bathing water quality and how we use coastal modelling to understand the geographical impact of a release. Contents: Applying the logic How we have determined which outfalls affect individual bathing waters How we use coastal modelling An explanation of how we coastal modelling to determine the geographic impact of a release List of bathing waters A table of all bathing waters and recreational harbours in the Southern Water region with links to specific location information 1 Document Title Subtitle Logic In order to determine which overflows have the potential to impact each bathing water, we apply the following process: Initial screening exercise to discount sources more than 10 km distant from the bathing water. Include overflows which discharge within approximately a tidal excursion of the bathing water. Screen geographical for rivers which discharger within approximately a tidal excursion of the bathing water. Include overflows which discharge to these rivers. The process is carried out separately for each of the 83 bathing waters in our area. A tidal excursion is the track that an object (a tracer) would take if thrown into the water. For example, a tracer thrown in at high water will move with the ebbing tidal until the tidal direction changes and then it starts to move back towards its original release point. Similarly a tracer released low water will move with the flooding tide until the tidal direction changes. It is this envelope between the change of direction on the flooding and ebbing tide, which defines the area where overflows may impact on a bathing water. For the analysis this envelope is extended to make sure that all impacting overflows at each bathing water are included. This process of understanding the tidal excursion is particularly important in more complex areas such as around the Isle of Wight. 2 Document Title Subtitle Coastal Modelling Our tidal models are used to understand how a release is moved with the tide and wind (this is called advection) and how it spreads out as it moves with the tide and wind (this is called dispersion). The models have all been checked against survey data (tidal levels, current speed and direction and dye tracing). This means that we can confident that the model is performing in the same way as the movement and dispersion of the plume from the release as it would in reality. If a release occurs, we gather as much data as possible on when the released started and stop, its volume and concentration and wind conditions in the time period around the release. These data are fed into the computer and the model simulation is started. The model produces a video of the track and concentration of the plume, maps of the plume at individual time slots and if needed graph of concentration at particular locations. An example of a map of a plume at a particular time slot is shown below. 3 Document Title Subtitle Bathing Waters Beachlands Central Beachlands West Bembridge Bexhill Bognor Regis Birling Gap Bognor Regis East Bracklesham Bay Aldwick Broadstairs Botany Brighton Central Brighton Kemptown Broadstairs Joss Bay Bay Broadstairs Stone Broadstairs Viking Calshot Camber Bay Bay Colwell Bay Compton Bay Cowes Deal Castle Dymchurch Eastbourne Eastney Felpham Hastings, Pelham Folkestone Gunard Herne Bay Beach Herne Bay Central Hillhead Hove Hythe Lancing Beach Green Lee on Solent Lepe Leysdown Langstone Harbour Highcliffe Margate Fulsam Littlehampton Littlestone Margate The Bay Rock Minnis Bay Middleton on Sea Minster Leas Norman's Bay Birchington Ramsgate Western Pagham Pevensey Bay Ramsgate Sands Undercliff Ryde Saltdean Sandgate Sandown Sandwich Bay Seaford Seagrove Selsey Shanklin Sheerness Shoreham Beach Southsea East Southwick St Helens St Leonards St Margarets St Mildreds Bay St Marys Stokes Bay Tankerton Westgate Totland Bay Ventnor Walpole Bay West Bay Westgate West Beach Westbrook Bay West Wittering Whitecliff Whitstable Margate Winchelsea Worthing Yaverland Chichester Harbour 4 Document Title Subtitle Bathing Water \ Location: Chichester Harbour Outfalls that impact location: 1. Kings Road Emsworth 2. Thornham 3. School Lane Nutbourne 4. Priors Leaze Lane Nutbourne 5. Chidham 6. Taylors Lane Bosham 7. Bosham 8. Mill Lane Fishbourne 9. Chichester 10. Fishery Lane Hayling Island Logic \ method used to determine which outfalls affect location: These outfalls have been identified because of their proximity to the bathing water and according to the tidal model which tells us where a release is likely to spread in a number of scenarios including time of tide, wind and volume/duration of releases. Back to bathing water list 5 Document Title Subtitle Brighton Central Outfalls that impact location: 1. Albion Groyne 2. Black Rock Marine Drive Logic \ method used to determine which outfalls affect location: These outfalls have been identified because of their proximity to the bathing water and according to the tidal model which tells us where a release is likely to spread in a number of scenarios including time of tide, wind and volume/duration of releases. Back to bathing water list 6 Document Title Subtitle Beachlands West Outfalls that impact location: 1. Fort Cumberland No 1 2. Fort Cumberland No 2 3. Green Lane Hayling Island 4. Fishery Lane Hayling Island Logic \ method used to determine which outfalls affect location: These outfalls have been identified because of their proximity to the bathing water and according to the tidal model which tells us where a release is likely to spread in a number of scenarios including time of tide, wind and volume/duration of releases. Back to bathing water list 7 Document Title Subtitle Beachlands Central Outfalls that impact location: 1. Fort Cumberland No 1 2. Fort Cumberland No 2 3. Green Lane Hayling Island 4. Fishery Lane Hayling Island Logic \ method used to determine which outfalls affect location: These outfalls have been identified because of their proximity to the bathing water and according to the tidal model which tells us where a release is likely to spread in a number of scenarios including time of tide, wind and volume/duration of releases. Back to bathing water list 8 Document Title Subtitle Bembridge Outfalls that impact location: 1. The Duver St Helens 2. The Point Bembridge 3. Hillway Bembridge 4. Lane End Road Bembridge 5. Latimer Road St Helens 6. Latimer Road St Helens Outside East View Logic \ method used to determine which outfalls affect location: These outfalls have been identified because of their proximity to the bathing water and according to the tidal model which tells us where a release is likely to spread in a number of scenarios including time of tide, wind and volume/duration of releases. Back to bathing water list 9 Document Title Subtitle Bexhill Outfalls that impact location: 1. Cooden Beach Bexhill 2. Hartfield Road 3. Richmond Road 4. Roedean Close 5. Bexhill Down 6. London Road 7. Galley Hill 8. York Road 9. Bexhill and Hastings No1 Logic \ method used to determine which outfalls affect location: These outfalls have been identified because of their proximity to the bathing water and according to the tidal model which tells us where a release is likely to spread in a number of scenarios including time of tide, wind and volume/duration of releases. Back to bathing water list 10 Document Title Subtitle Birling Gap Outfalls that impact location: 1. Eastdean Logic \ method used to determine which outfalls affect location: These outfalls have been identified because of their proximity to the bathing water and according to the tidal model which tells us where a release is likely to spread in a number of scenarios including time of tide, wind and volume/duration of releases. Back to bathing water list 11 Document Title Subtitle Bognor Regis Aldwick Outfalls that impact location: 1. Carlton Avenue Bognor 2. Aldwick Avenue 3. Marine Drive West 4. Aldwick Road 5. Esplanade 6. Gloucester Road 7. Bognor Main 8. Shripney Road South Bersted 9. Durban Road 10. Chichester Road Logic \ method used to determine which outfalls affect location: These outfalls have been identified because of their proximity to the bathing water and according to the tidal model which tells us where a release is likely to spread in a number of scenarios including time of tide, wind and volume/duration of releases. Back to bathing water list 12 Document Title Subtitle Bognor Regis East Outfalls that impact location: 1. Carlton Avenue Bognor 2. Aldwick Avenue 3. Marine Drive West 4. Aldwick Road 5. Esplanade 6. Gloucester Road 7. Bognor Main 8. Shripney Road South Bersted 9. Durban Road 10. Chichester Road Logic \ method used to determine which outfalls affect location: These outfalls have been identified because of their proximity to the bathing water and according to the tidal model which tells us where a release is likely to spread in a number of scenarios including time of tide, wind and volume/duration of releases. Back to bathing water list 13 Document Title Subtitle Bracklesham Bay Outfalls that impact location: 1. Charlmead East Wittering Logic \ method used to determine which outfalls affect location: These outfalls have been identified because of their proximity to the bathing water and according to the tidal model which tells us where a release is likely to spread in a number of scenarios including time of tide, wind and volume/duration of releases. Back to bathing water list 14 Document Title Subtitle Brighton Kemptown Outfalls that impact location: 1. Albion Groyne 2. Black Rock Marine Drive Logic \ method used to determine which outfalls affect location: These outfalls have been identified because of their proximity to the bathing water and according to the tidal model which tells us where a release is likely to spread in a number of scenarios including time of tide, wind and volume/duration of releases.