Arun and Western Streams River Basin Catchment

We have developed the first Drainage and Wastewater Management Plan (DWMP) for the Arun and Western Streams River Basin Catchment.

We have 59 wastewater systems in this catchment, with 434 pumping stations and 4,001 km of sewers. We cover 12% of the geographical area (mainly the urban areas and villages of Horsham, Arundel and Littlehampton, Bognor Regis and Chichester) with 93% of the homes in the catchment connected to our wastewater systems.

Our DWMP sets out our priorities for the Arun and Western Streams River Basin Catchment. These include:

• Reducing the number of spills from the 90 storm overflows which together currently spill around 2600 times per annum
• Separating or attenuating excess rainwater in the sewer networks to reduce the risks of flooding and frequency of storm overflow discharges, especially in Fittleworth, Loxwood, Chiddingfold, Northchapel and Billingshurst
• Investigating the potential impact of wastewater discharges on Good Ecological Status at the Aldingbourne Rife and the River Arun
• Planning for potential significant developments at Bersted, Horsham, the old Ford Airfield, Arundel, Southleigh, Southbourne, Tangmere, Bracklesham, Barnham and Littlehampton
• Considering the Manhood Peninsular (Sidlesham and Pagham systems) for a catchment approach to tackle multiple water related issues including climate change, sea level rise, flooding, water resources, water quality, new development, biodiversity and habitat loss
• Improving the resilience of our networks and treatment works to prevent pollution incidents, particularly in Bosham, Horsham, Barnham (Lidsey) and Siddlesham
• Reducing the risk of sewer blockages by increasing sewer jetting and targeting customer campaigns to reduce the amount of FOG (fats, oils and grease) and unflushables in the sewer network around Horsham, Littlehampton, Bognor Regis, Nutbourne and Emsworth.

All the stages we followed in developing the DWMP for the Arun and Western Streams are set out in the subsections below. Please explore these pages to find out more. You can find detailed investment needs in the tables on the Arun and Western Streams Options Development and Appraisal page.