§ 720-27. Master Plan.  


Latest version.
  • The utility engineer shall establish and maintain a master plan for a stormwater system designed to handle the stormwater runoff. The master plan shall provide or be accompanied by maps or other descriptive material showing, at a minimum, the following:

    (1)

    An inventory of the existing stormwater facilities plus the extent and area of each watershed tributary to the main drainage channels in the city.

    (2)

    The street storm sewers and other storm drains to be built; the basis of their design; the outfall, inlet and outlet locations; the receiving stream or channel and its high water elevation; and the functioning of the systems and facilities during high water conditions.

    (3)

    The parts of the proposed street system where pavements are planned to be depressed sufficiently to convey or temporarily store overflow from storm sewers and runoff over the curb resulting from the heavier rainstorms and the outlets for such overflow.

    (4)

    Existing streams and floodplains to be maintained, enlarged, altered, and eliminated; and new channels to be constructed, their locations, cross-sections and profiles.

    (5)

    Existing culverts and bridges, drainage areas, and adequacy of waterway openings; and new culverts and bridges to be built, waterway openings and the basis of their design.

    (6)

    Existing detention ponds and basins to be maintained, enlarged, and altered; and new ponds or basins to be built with dams, if any.

    (7)

    The slope, type, and size of all storm sewers and other waterways.

    (8)

    For all detention retention basins, a tabulation of storage volumes with corresponding water surface elevations and of the basin outflow rates for those water surface elevations.

    (9)

    For all detention/retention basins, design hydrographs of inflow and outflow for the design year under developed conditions and the calculated frequency peak flows from the site under natural and developed conditions.

    (10)

    An examination of the need for reduction of pollution loads resulting from surface runoff where applicable, now or in the future.

    (11)

    Estimates of cost.

(Ordained by Ord. No. 281-1985. eff. July 19, 1985; Emer. Ord. No. 156-2016, § 3, eff. June 15, 2016)