Study the table below, which shows information about different styles of coastal management.
| Management Method | Initial Cost per Metre | Maintenance Cost per Year |
|---|---|---|
| Hard Engineering | ||
| Timber groynes | £4,500 | £150 |
| Gabions | £950 | £25 |
| Soft Engineering | ||
| Sand dune regeneration | £180 | £40 |
| Cliff regrading | £300 | £15 |
Using the table and your own geographical knowledge, identify one difference between hard engineering and soft engineering in terms of:
Cost
Environmental impact
