butt closed conservation conserve drought green irrigation plastic rain rainwater storage tap wastewater water downpipe drain artificial conserving drainage drought-protection lined liner liners park pipes piping pond public ripples rippling storing treatment water-saving coast coastline colors colours cultivating cultivation dune-flora dunes environment environmental flora grass grasses greenery growing growth natural nature ocean ocean edge planting plants protect protection reclaim reclamation replanting rough salt-resistant sand sand-dunes scrub vegetation backdrop background beach coastal contrast contrasting foliage leafy leaves levels light ocean-edge ocean-waterline tides waterline