Gorgeous Waterfall Replaces Tacky Timber Retaining Wall May 27, 2015 by lrogers Crumbling timber walls and soggy lawn areas were replaced with stone retaining wall with attached bluestone terrace. Two staircases lead to upper pea gravel patio set in woodland garden and edged with boulders and flagstones. Picture Gallery Gorgeous Waterfall Replaces Tacky Timber Retaining Wall