Inland Reservoir

Coastal Reservoir

Dam-site

Limited (mountainous area)

Unlimited

(inside/outside

river mouth)

Dam design

High pressure

Low pressure but

with wave/tidal surge

Seepage

By pressure difference

By density difference

Pollutants

Land based

Land based + seawater

Resettlement costs

High

None

Water supply

By gravity

By pump

Water catchment

Small part

Whole catchment