Patent ID: 8057091

Claim:
A water circulation system for drawing water from the depths of a body of water to the surface for exposure to the atmosphere and creating a circulation pattern in the body of water, said system including a flotation platform, a dish, an impeller, and a draft tube with an adjustable length, said draft tube having a lower end portion and said system further including an arrangement ( 130 ) to adjust the depth of the lower end portion of the draft tube in the body of water and to align the lower end portion of the draft tube substantially horizontally, said adjusting and aligning arrangement ( 130 ) including at least three substantially linear members ( 132 ) substantially equally spaced from each other about a substantially vertical axis ( 13 ), said linear members having respective lower portions ( 132 â€²) respectively fixedly attached adjacent the lower end portion of the draft tube at respective positions substantially equally spaced from each other about the lower end portion of the draft tube and about the vertical axis ( 13 ), said linear members additionally having respective upper portions respectively securable to said flotation platform at respective positions substantially equally spaced from each other about the flotation platform and about the vertical axis ( 13 ), each upper portion being respectively adjustably securable to said flotation platform at different locations along said upper portion to thereby vary the distance between the affixed lower portion of the respective linear member and the secured location of the upper portion thereof, said flotation platform extending above the surface of the body of water and said secured locations of the linear members being respectively above the surface of the body of water, each linear member additionally having a set of depth markers attached thereto and substantially equally spaced from each other along the length of each linear member, each depth marker in each set having a different number thereon with the numbers in each set of depth markers on the respective linear members corresponding to and being the same as in the other sets, the corresponding depth markers of each set being positioned along the respective linear member at the same distance from the attached position of the respective linear member to the lower end portion of the draft tube wherein the secured location of each of the upper portions of the linear members can be set with the corresponding depth markers of the linear members at the same distance from the surface of the body of water to adjust the depth of the lower end portion of the draft tube below the surface of the body of water and to align the lower end portion of the draft tube substantially horizontally at said depth.