Ordinances-2003-260

of the adjacent property. The drainage and the stability of the highway sub grade must not be impaired by access construction or roadside development. In no case may the construction of an access cause water flow across the highway pavement, or to pond on the shoulders or in the ditch, or result in erosion within the right-of-way. Detention basins, berms, or detention outlet facilities shall not be allowed within the prescribed roadway right-of-way. ii. Additional drainage collected by ditches, gutters, or pipes on private property shall not be discharged into the highway drainage system unless expressly approved by the City of Tiffin City Council. The permittee may be required to submit a drainage study to the City of Tiffin justifying the drainage system proposed and the pipe or sewer sizes to be used. Natural drainage patterns and practices must be observed. Drainage for the access shall be designed in accordance with the requirements of the IDOT Manual and a NPDES permit must be acquired if necessary. iii. Where the construction of an access necessitates crossing a highway ditch, a culvert pipe or any required storm sewer shall be installed by the permittee. The low point of the access profile shall be at or close to the ditch line. Under no circumstances shall the ditches or gutters be filled without adequate alternate provisions for drainage being made. Headwalls shall not be used at access culverts. iv. Culvert pipe for proposed accesses shall be of a size adequate to carry the anticipated flow in the ditch as determined by the City of Tiffin City Council and shall not be smaller than 15 inches inside diameter. v. The structural material and gauge of the access culvert pipe shall be able to withstand the loads from the anticipated vehicular traffic across the driveway. The culvert shall meet the requirements of the Iowa Standard Specifications for Road and Bridge Construction. The length of the culvert may be determined as the sum of the width of the access (surfaced width and shoulder) at the ditch line and the length needed to accommodate a side slope of at least 1 vertical to 4 horizontal from the access grade to the ditch. Along sections of highway on which some end treatments on entrance culverts were provided on original construction or by reconstruction,