First of all, i would like to give credits to whom these photos belong. (taken from skyscrapercity.com)
This is a great example of drainage beautification. Japan being a land of sakura does emphasis on enhancing its landscape with cherry blossom trees. It is kind of typical scenery during spring in Japan where sakura blossoming along rivers and water drainage. Even a small drainage like photos above are beautifully manicured to bring excitement to the local communities and memories to those who visited the place.