The following requirements and performance standards are required for the storm drainage report submitted to the city:
A. Map: A map indicating the on site and off site drainage area applicable to the site;
B. Calculations Showing Predevelopment Flows: Calculations developed showing the predevelopment flows for the 25-year, 24-hour storm and the postdevelopment calculations for the same storm. The difference of predevelopment and postdevelopment must be retained on site; (Ord. 455, 12-6-2012)
C. Engineering Plans: Detailed engineering plans of all subsurface drainage improvements to be constructed as a part of the proposed development; and
D. Drainage Easements, Rights Of Way: Location of all drainage easements, or drainage rights of way.
E. Storm Drainage Performance Standards:
1. Provisions for runoff drainage shall be designed to safely retain stormwater or adequately carry and discharge accumulated runoff into drainage channels, storm sewers.
2. The city engineer may require the applicant to design and construct dry wells, energy dissipaters, or other drainage improvements in order to control and reduce runoff from the site. The design for these drainage facilities shall be submitted for approval with the runoff drainage plan. (Ord. 382, 10-25-2006)