There are two reasons why councils spend so much cash on protecting the coastline in certain areas…
First – To keep the sea out and protect homes and businesses
Secondly – To keep the beach there to maintain the tourist trade.
To keep the sea out ….. Build a sea wall to deflect the power of the waves away from the seafront. However - Lots of maintenance needed and they are expensive to build. The Catch - Councils will only pay for them if there are many people and much property to defend.