First, the material: color aluminum (aluminum-manganese alloy) BAN model overboard exterior colors see Materials II, according to the rainfall reached 40-60 mm / hr for heavy rain riser vertical displacement of 0.1 cubic meters / second, a comprehensive K VII. 83X63 inch gutter with rectangular square tube riser, within 10 meters parallel effective displacement and specifically through an angle of each of the displacement amount ,, no more than 130 square meters of roof, gutter more than four point bend no more than 70 square feet, This project a standpipe, the largest catchment area of ??120 square feet, the smallest catchment area of ??58 square feet. Therefore the choice of K7 filling gutters with 83 * 63 square tube can meet function. Third, propose legislation to use 1mm wall thickness of the seamless tube pipe, can effectively prevent the wall of water seepage, water pipes and other touch flat to happen now. (1mm wall thickness of the pipe in the following construction and later in life and is easy to touch owners flat, after damage replace cumbersome and difficult secondary colors can be replaced with the same). Fourth, the project floor general at 3-4 height, air waste and leaves difficult to drift into the clogged drain to the days of the trench. Therefore proposed to abandon the use of network file leaves. V. 1, Pets color: color same supplier should not be greater than E = 1.0; color under different supplier can not be greater than E = 2.0. Coating thickness 30um 2, the coloring process: The international advanced six-step electrostatic spraying, degreasing - chromium - anticorrosion primer - paint - varnish - cured, double anti-corrosion paint, 10-year warranty. 3, the surface quality of the decorative surface: Do not allow air bubbles, scratches, holidays, color, prints and other defects, do not allow visual inspection is not obvious from the surface of 1.5m slight defect in natural light conditions. 4, flatness: gutter side flatness of not more than (3mm / m). Vertical downspout is not greater than (2mm / m).