Resolutions-1997-021

rigid ball or mandrel having a diameter equal to 95% of the inside diameter or the pipe and the tests shall be performed without mechanical pulling devices. 9.12 SEWER LOCATION AND EASEMENTS A. Manholes in street right-of-way must be located in areas which allow direct access by maintenance vehicles. Manholes in area outside the street right-of-way shall be subject to the approval of the City Engineer in which case access to the manhole shall be along a route in which the transverse slope does not exceed 4% and longitudinal slope does not exceed 12%. B. Sewers shall be placed a minimum horizontal distance of 1.5 times the depth from potential or existing building sites. Greater separations are desirable. C. All storm sewers outside public right-of-way shall be placed in an easement for operation and maintenance. Easement width from the center of the pipe shall generally be 1.5 times the sewer depth rounded up to the nearest 5 feet. D. The minimum easement width is 10 feet. E. Drainage way easements for overland flow shall be of sufficient width to contain the 100 year flow and as a minimum shall include the bottom width and side slopes of the drainage way and any necessary overbank areas. 9.13 STORMWATER MANAGEMENT FACILITIES A. Storm water management facilities shall be required for new subdivisions and for subdivisions in order to ensure public safety and avoid property damage from excessive runoff. The City Engineer may, on a case by case basis, waive this requirement for developments with 3 acres of less in size. B. Detention Requirements: 1. New developments which require storm water management shall be required to detain the difference in the volume between the five year undeveloped storm and the 100 year developed storm events for their development site. For redevelopment of a site that does not presently have storm water management the undeveloped condition shall be calculated assuming pasture conditions. 2. The maximum release rate for detention calculations shall be the five year undeveloped storm. C. Methodology: 1. The SCS TR-55 computerized runoff volume program or other technically proven method, shall be used to determine the volume of runoff which must be detained. 2. The results of these calculations, including a design summary, shall be submitted on a standardized form which shall include all of the individual parameters that the designer inputs into the program.