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• (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 are 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. (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. (2) Single-family residential home builders shall, at the time of a building permit application, submit a plot plan indicating how the builder proposes to grade the lot and provide proper lot drainage. This individual lot drainage plan shall conform to the subdivision lot drainage plan as described in this subsection. (3) In order to avoid the potential for damage due to local flooding, all lots shall have the lowest livable finished floor elevation of any building a minimum of six inches above the finished elevation grade, except basement floors. The finished elevation grade shall be measured from and include topsoil and sod,and/or other ground covers. (4) All lots shall be provided with adequate drainage and shall be graded to drain surface water away from foundation walls. The grade away from foundation walls shall fall a minimum of six inches within the first ten feet except as restricted by lot lines, where the fall will be a minimum of six inches regardless of the horizontal distance available. (5) Lot owners shall not extend the downspouts of roof gutters, french drains or other type of stormwater drains to the edge of the property lines unless the discharge empties directly into an approved drainage facility (open drainage ditch, storm sewer manhole, street gutter, or areas zoned open-space). Lot owners shall not connect their stormwater drains to any existing • city-owned underground drainage pipe. (6) In those instances where the roof gutters, french drains or other types of stormwater drains cannot discharge into one of the facilities referenced in this subsection and is therefore - 178 - Batesville Subdivision Regulations