cascade cascading flow flowing free gold golden image nature photo stock streaming sunny water waterfall wet aerate aeration architecture buttresses dam danger drop Elan Valley fall hold landmark old reservoir retain stone wales wall welsh background texture cascades cold falling fresh high impressive kjosfossen loud mighty mountain mountains norway norwegian power powerful rocks strong wild abstract appearance backdrop color colour drops gray grey solid spray stone wall stones stonework surface surfaces textures varied water spray 783889 783890 783892 bloom blossoms blue flowers petals phlox spring formal garden lake pond river steps stream Victorian feature feature-wall patterned patterns stone-wall water-feature water-spray colored colors coloured colours