§ 50-582. Storm drainage.

(a)

When deemed necessary by any department, commission or the board of county commissioners, a drainage design prepared by a state registered professional engineer may be required which will include detailed construction plans, supportive calculations and any additional information related or required therewith.

(b)

The engineer's attention is directed to the following:

(1)

Where drainage runoff comes from outside the limits of the subdivision, it shall be included in the design.

(2)

Design storm intensity-frequency data shall be taken from the state department of transportation drainage manual for this zone or may be taken from storm intensity-frequency data published by another governmental agency if approved prior to use.

(3)

Culverts shall be designed for a ten-year storm frequency and all other facilities and structures shall be designed for a 25-year frequency.

(4)

The study shall include the effect of the subdivision on all downstream owners.

(5)

Special consideration shall be given to avoid problems from concentration on all downstream properties.

(c)

Every lot platted for residential or any other use shall contain a nonfloodprone area which is adequate to accommodate all structures, drainfields and other improvements or land uses, and remain in compliance with the setbacks established by the county zoning ordinance, health department and other state agency rules, and schedule III, footnote 1 of the county zoning ordinance; unless no such lands exist on the property to be subdivided. All other floodprone areas shall be set aside for such uses, such as but not limited to public dedication as shall not be endangered by periodic or occasional inundation. All floodprone areas shall comply with article VI of this chapter. All floodprone areas shall be shown on the preliminary plat.

(1991 LDR ch. 71, § 4.06)