§ 30-123. Drainage design criteria.

Design Storm Event

The drainage systems for the following development categories, uses, and infrastructure categories shall be designated and evaluated for the following designated storm events:

Type	Design Event (min.)	Retention/Detention Event	Evaluated For
Site
Drainage system and outfalls for commercial or multi-use subdivision	10-year storm	10-year storm 25-year storm	100-year storm
Drainage system and outfalls for residential subdivision	10-year storm	10-year storm 25-year storm	100-year storm
System
Channel/system modification	10-year storm	25-year storm	25 and 100-year storms
Collector street crossings	10-year storm	N/A	25 and 100-year storms
Arterial street crossings	25-year storm	N/A	100-year storms
Channel crossings in excess of 100 square feet	25-year storm	N/A	25 and 100-year storms
Relocated channel	100 year storm	N/A	100 year storm

 

For developments up to and including 2.5 acres

For developments larger than 2.5 acres

Channels shall not be incorporated into a storm water management facility

Or such lesser minimum design storm event as determined by the city.

(Ord. No. 2002-017, § 4(c), 5-20-2002; Ord. No. 2016-018 , § 2, 12-19-2016; Ord. No. 2017-013 , § 2, 11-20-2017; Ord. No. 2018-017 , § 2, 12-17-2018)