A.   Any existing, unimproved platted land which contemplate development similar to the uses described in section 16.26.010 of this chapter may be required to submit a drainage plan. This determination shall be made by the city engineer prior to the issuance of building permit.
   B.   The city engineer shall also have the discretion to request a drainage plan for smaller improvement projects which present a particular or unique drainage problem to surrounding properties or adversely impact existing storm drainage systems in the immediate area. The city engineer will review these projects on a case by case basis and apply the standards outlined in this chapter to evaluate potential downstream effects of each improvement. (Ord. 1628 §§ 1, 3, 1988)