(A) The following principles are effective in minimizing erosion and sedimentation and shall be included where applicable in the plan both during and after development.
(1) Stripping of vegetation, regrading, or other development shall be done in a way that will minimize erosion. Whenever feasible, natural vegetation shall be retained, protected and supplemented;
(2) Development plans shall preserve salient natural features, keep cut-fill operations to a minimum and ensure conformity with topography so as to create the least erosion potential;
(3) Development plans shall not impair existing surface drainage, constitute a potential erosion hazard, or act as a source of sedimentation to any adjacent land or watercourse;
(4) The smallest practical area of land shall be exposed at any one time and the duration of exposure shall be kept to a practical minimum, the topsoil shall be preserved and returned to the surface of areas to be revegetated;
(5) Disturbed soils shall be stabilized as quickly as practicable with temporary vegetation and/or mulching to protect exposed critical areas during development;
(6) The permanent final vegetation and structural erosion control and drainage measures shall be installed as soon as practicable in the development;
(7) Provisions shall be made to accommodate effectively the increased runoff caused by changed soil and surface conditions during and after development;
(8) Sediment in the runoff water shall be trapped by the use of debris basins, sediment basins, silt traps, or similar measures, until the disturbed area is stabilized.
(B) The following standards shall be followed in all water management, erosion and sediment control plans.
(1) All lots, tracts, or parcels shall be graded to provide proper drainage away from buildings and dispose of it without ponding, and all land within a development shall be graded to drain and dispose of surface water without ponding;
(2) All drainage provisions shall be of such design to handle the surface runoff adequately and carry it to the nearest suitable outlet such as a curbed street, storm drain, or watercourse. Where drainage swales are approved to divert surface waters away from buildings, they shall be sodded, planted, or paved as required, and shall be of such slope, shape, and size as to conform with the requirements of the city. Drainage swales must be maintained continuously per plan by the owner of the property upon which constructed;
(3) The installation of the specified water management and sediment control measures shall be accomplished in accordance with the standards and specifications contained in water management and sediment control for urbanizing areas on file with the office of the Public Works Director, the Hamilton County Soil and Water Conservation Service, and the Hamilton County Stormwater District unless otherwise recommended by the Building Commissioner;
(4) During the construction phase, further consultive technical assistance will be furnished, if necessary, by the city, or by the local representative of the U.S. Soil Conservation Service.
(C) The approved plan for water management and sedimentation control required of the landowner or his or her agent under this chapter, shall include, but not be restricted to, the following requirements:
(1) A vicinity sketch and boundary line survey of the site for which the permit is sought and on which the work is to be performed;
(2) The location of any buildings, structures, utilities, sewers, water and storm drains on site where the work is to be performed;
(3) The location of all trees with a trunk diameter of greater than four inches measured at a point five feet from the ground, or in the alternative, at the option of the city, a report on the trees from an arborist approved by the city;
(4) The location and elevation of any building or structure on land of adjacent property owners within 100 feet of the site;
(5) The elevations, and/or contours, dimensions, location, and extent of all work proposed to be done, and the existing elevations and/or contours of the land, all in one-foot increments;
(6) Detailed plans of all drainage provisions, storm water detention (if required), retaining walls, cribbing, vegetative practices, erosion and sediment control measures, location of proposed fences around sediment basins, steep excavations, or ponding areas, and other protective devices to be constructed in connection with, or as a part of, the proposed work together with a map showing the drainage area of land tributary to the site, and estimated cubic foot per second runoff, when developed, of the area served by any drainage provisions, computed in accordance with minor and major storm runoff hydrology as established in storm drainage calculations meeting Hamilton County Rules and Regulations for storm water runoff in urbanized areas;
(7) A timing schedule and sequence indicating the anticipated starting and completion dates of the development sequence, stripping and/or clearing, rough grading and construction, final grading and vegetative establishment, and maintenance, and the time of exposure of each area prior to the completion of effective erosion and sediment control measures;
(8) The estimated cost of the grading and/or filling and the cost of the required erosion and sedimentation controls; and,
(9) In any area of special flood hazard where base flood elevation data are available, the following information is required: elevation of the lowest floor, including basement, of all proposed structures; elevation to which any structure will be floodproofed; and certification by a registered professional engineer or architect that the floodproofing methods for any nonresidential structure meet the criteria of § 154.05(B)(1).
(Ord. 13-1988, passed 3-2-88; Am. Ord. 5-1993, passed 2-3-93; Am. Ord. 5-2006, passed 4-5-06)