The natural drainage shall be used as far as is feasible for the storage and flow of stormwater runoff. The design of any drainage system or stormwater conveyance shall conform to title 8, chapter 5 of this code. These additional requirements shall also apply:
A. No existing ditch, stream, drain channel or other stormwater conveyance shall be altered without written permission from the city.
B. If possible, any necessary drainage ditches should be constructed in a manner to also serve recreational trail use.
C. The front setback line of every lot shall be within four feet (4') in elevation of the centerline of the nearest street unless specifically allowed by the planning and zoning administrator.
D. Every lot shall be developed so that it retains the stormwater runoff of a 100-year rain event as determined in a 100-year stormwater elevation study if said lot is not served by storm sewer or some other city maintained stormwater drainage system. If a lot is so served by some city maintained stormwater drainage system it shall retain the stormwater runoff of a 5-year rain event. (Ord. 2014-02, 2-18-2014)