Terraced drop wells.They are common or special wells to which a structure is built on the side that allows the fall in pipes of 30 cm in diameter with a drop of up to 2.00 m.Rainwater must be channeled to the drainage storm inlets, giving slopes of 2% on the tributary surfaces near the buildings, and at least 0.5% in the most remote areas, provided that it is shown that there will be no possible flooding of the areas.The design cost must be obtained by applying the American Rational Method, for which the intensity-duration-return period curves of the Site must be applied (obtained from the Hydrological