(NB: the BIS4.2 quantity above is approximate; a more accurate figure will be available here shortly)

Bournemouth beach loses approximately 70,000 m³ of material annually (1 million m³ every 13 years).  Since the predominant direction of longshore transport in Poole Bay is from west to east, sand gradually feeds the beaches at Southbourne and Hengistbury Head to the east, and beyond into Christchurch Bay.  

In the past the Council has carried out "boom & bust" replenishment schemes, where the beach is delivered with a large quantity of material (e.g. 1974/75) and left until much of it is lost before further replenishment (e.g. 1988/89).

For at least three years (2008-2010) there is a plan to make good the annual losses to keep the beach at a constant level and volume (BIS4.3 - 4.5).  Replenishment will be localised and take just a few days.

Beach Improvement Scheme 4.3 took place in March 2008 and replenished four groyne bays between Boscombe & Southbourne.  The locations for BIS4.4 & 4.5 have yet to be determined.  Replenishment is undertaken during winter months in order to minimise disturbance to public access & enjoyment.