bank countryside diminished drought empty England english forest Great Britain lack lake landscape less natural nature reservoir rural shore shortage spring Sussex water wood arches architecture dam Elan Valley hills hold landmark old retain stone tower wales wall welsh green hill trees woodland creek margin pond cumbria fell moorland pool ridge tarn valley view wilderness buttresses road background hampi India landscapes reflection river rivers rock rocks south stones tungabadra wallpaper arbour calm earth flora mere palace pavilion peaceful pergola plant quiet serene silent building china construction controversial electricity energy environment flood hydro hydroelectricity power protection Sandouping three gorges Yangtze aerate aeration cascade cascading danger drop fall