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(b) Facility design specifics (1) Facilities for storm drainage shall be designed in conformance with the current Stormwater Management and Drainage Manual. (2) All open drainage ditches shall conform to the requirements of the Stormwater Management and Drainage Manual. Open drainage ditches along lot lines of residential property shall not be permitted unless approved by the City Engineer,and only then in extraordinary circumstances. (c) Street-related. (1) All street-related storm drains shall be designed based on the requirements of the master street plan and the Stormwater Management and Drainage Manual. (2) All streets shall be provided with permanent six ipch(6")concrete curbs with twenty-four inch(24") integral concrete gutters or standard roll curb and gutters. The subdivider may request a waiver of this requirement when it can be demonstrated,to the satisfaction of the City Engineer and Commission,that: a. The subdivision is in a low-density zoning district(inside of city limits)or that the density of development is consistent with low density residential lot standards(outside of city limits)and, b. An alternative street drainage system design is more practical and effective than curbs and gutters. While relative cost may be a factor in this determination,for the purposes of this section, "practical"and"effective"shall refer primarily to hydraulic calculations with respect to desirable storm water run-off and relationship of the street to the Comprehensive Plan. The substitution of swales for curbs and gutters on streets wider than twenty four feet(24')may be approved on a case-by-case basis, if the developer can submit oa an overall development plan with a report,prepared and stamped by a registered professional engineer, which shows that the use of open swales and oversized lots will result in a decrease in the amount and peak rate of storm water run-off compared to development using standard minimum requirements. (d) Easements. (1) Where a major watercourse, channel or stream traverses a subdivision,a storm drainage easement shall be provided for access of vehicles and equipment for its maintenance. Such easement shall conform substantially to the lines of the watercourse as it enters and leaves the property.The width and construction of the easement shall be based on the classification of the watercourse,channel or stream, in accordance with the master drainage facilities plan, but in no case shall the easement be less than ten feet on either side of the centerline of the watercourse. (2) There shall be no structural encroachments into drainage easements of class I through V drainage facilities as defined by the master drainage facilities plan. If such facilities arc an enclosed(underground and covered)drainage system then fences, parking lots, driveways,alleys and the like may encroach into or traverse the drainage easement. (3) No utilities,except for utility crossings, shall be allowed to encroach into defined drainage easements. (4) Wherever possible, subdivisions should be designed with utility easements on one side of lot lines and drainage easements on the other. (e) Lot drainage. o (1) In single-family subdivisions,the project engineer or subdivider shall submit,along with the other necessary construction drawings and documents, a subdivision lot drainage plan. This plan shall indicate how the project engineer or subdivider proposes that each individual lot shall drain after it has had a residential structure built on the lot. This plan shall be reviewed and approved by city staff to ensure that proper drainage of the individual lot can occur.Once this plan is approved, it shall be used by city staff as a tool to assist the individual homebuilders in the final grading of the lot to provide the necessary lot drainage.