§ 2.6. Technical Criteria

The storm drainage planning and design should follow the criteria within this manual.

The following two items should be considered during the design process.

1)

Diversion of storm water away from the natural watercourse will not be allowed, except within the property boundaries controlled by the developer under the following conditions: a) The storm water is returned to its natural flowing watercourse prior to leaving the developer's property, b) For watersheds greater than twenty (20) acres, a timing analysis of the existing and diverted hydrograph must be performed to confirm that the peak flow rate has not been increased at the point that it reenters the watercourse, as a result of the diversion.

2)

All developments shall provide adequate drainage outfall at the lower end of the site into an existing street, alley, drainage, easements or right-of-way, or to the centerline of an existing natural drain. Where a proposed street, storm drain, or open channel does not discharge into a natural low or into an existing adequate drainage easement, then facilities and drainage easements of adequate width — to contain the design discharge — shall be constructed and dedicated to the centerline of an existing natural low within the same watershed. However, when the natural low lies within the developer's property, the developer will only be required to plat an easement to the centerline of the natural low; provided that the easement is able to accommodate the facilities that will be built in conjunction with future development of that property.