Installing a water feature can enhance a long, narrow side return. Here an eye-catching rill, a canal of reflective water, complements the modern, glass extension to this Chiswick house. Small planting areas separate the water chambers which, at only 40cm deep, are easy to maintain. Behind the rill, tensioned wires run between timber posts enabling climbing plants to create a living wall, an evergreen backdrop to disguise the boundary wall. Sandstone stepping stones create a path to the rest of the garden. All that is needed is a small fishing net to clear the rill of garden debris.