Waterfall with locking upper and lower lips and an angled extrusion arm combined with a screen

A waterfall apparatus comprising:

• a water confining base, said base including a bottom and a plurality of upwardly extending side walls connected to said bottom;
• a water inlet connected to said base for providing a path of travel for water entering said base;
• a water outlet connected to said base, said water outlet including an upper lip connected to at least a first one of said plurality of side walls and extending outwardly therefrom, and a lower lip spaced apart from said upper lip, connected to at least to a second one of said plurality of side walls, and extending outwardly therefrom so that water positioned within said base flows between said upper and lower lips and outwardly and downwardly therefrom;
• a water flow guiding arm connected to said base and extending downwardly at a predetermined angle therefrom into the inner confines of said base to provide a water flow path of travel from said water inlet, around said guiding arm and from said water outlet, the predetermined angle being less than 90 degrees;
• and
• a removable concave screen with an apex and two ends where said apex extends to said base and one of said ends extends to said water flowing guiding arm.

A method of controlling water flow so as to form a waterfall, the method comprising:

• supplying a stream of water into a water basin which includes a bottom and a plurality of side walls;
• breaking the stream of water with a water flow guiding arm extending downwardly from an upper portion of at least one of the plurality of side walls at a predetermined angle therefrom, the predetermined angle being less than 90 degrees;
• breaking the stream of water with a screen extending from said water flow guiding arm and to said bottom of said water basin;
• filling the water basin with the stream of water so that water slowly fills the basin from a lower portion thereof and upwardly therefrom;
• trapping debris behind said screen;
• and
• allowing water to exit from an outlet of the water basin in a relatively smoothly flowing stream to a pool of water positioned at a lower elevation than the water outlet.