abstract appearance backdrop background cascade cascading color colour drops feature feature-wall gray grey patterned patterns solid spray stone stone-wall stonework surface surfaces textures varied water water-feature water-spray waterfall wet aerate aeration architecture buttresses dam danger drop Elan Valley fall hold landmark old reservoir retain wales wall welsh aquilegia aquilegia atatra closeup columbines dark columbine dew flowers green macro magenta petal petals pink pistil purple rain violet wild colored colors coloured colours rocks stone wall stones center central centre centred clinging close-up cold droplets fine foliage greenery leaves light magnifying moist moisture plant radiating raindrops reflection reflections reflective round rounded stems symmetrical symmetry texture vegetation winter wintery Athabasca boulder canada current deluge falls fierce flow landscape natural nature plunge pour river rock Rockies Rocky Mountains torrent turmoil