(A) (1) The following criteria should be used in evaluating and designing the drainage system. The design will provide capacity to pass the ten-year, 24-hour peak flow in the minor drainage system and an overload flow path (major drainage system) for flows in excess of the design capacity.
(2) Whenever practicable, the stormwater systems shall not result in the inter-basin transfer of drainage unless no other alternative exists.
(B) The design rainfall recurrence interval shall be set by the design application as follows:
Bridges | 100-year |
Detention | 100-year |
Emergency overflow routing | 100-year |
Roadway underpasses | 50-year |
Storm sewers | 10-year |
Swales, ditches, and culverts | 25-year |
(Ord. passed - -)