Stormwater Management Standards Manual - Toledo Metropolitan ...

more than 1.0 foot. (Some jurisdictions may have slightly different regulations. In Toledo, one-half foot is
the measurement.)
The intention of the floodway is not to preclude development. However, Federal Emergency
Management Agency (FEMA) regulations make each community responsible for prohibiting
encroachments, including fill, new construction, and substantial improvements, within the floodway
unless it has been demonstrated through hydrologic and hydraulic analyses that the proposed
encroachment will not increase flood levels within that community.
In areas that fall within the one percent annual chance floodplain, but are outside the floodway (termed
the "floodway fringe"), development will, by definition, cause no more than a one-foot increase in the one
percent annual chance water-surface elevation. (In Toledo, one-half foot.) Floodplain management
through the use of the floodway concept is effective because it allows communities to develop in floodprone
areas if they so choose, but limits the future increases of flood hazards to no more than one foot
(or one-half foot in Toledo.)
The only development in a Regulatory Floodway which will be allowed are appropriate uses which will
not cause an increase in flood heights for all flood events up to and including the base flood. Only the
construction, modification, repair, or replacement of the following appropriate uses will be allowed in the
Regulatory Floodway:
A. Public flood control structures and private improvements relating to the control of drainage and
flooding of existing buildings, erosion, water quality, or habitat for fish and wildlife;
B. Structures or facilities relating to functionally water dependent uses such as facilities and
improvements relating to recreational boating and as modifications or additions to existing wastewater
treatment facilities;
C. Storm sewer outfalls;
D. Underground and overhead utilities if sufficiently flood-proofed;
E. Recreational facilities such as playing fields and trail systems including any related fencing (at least
50% open when viewed from any one direction) built parallel to the direction of flood flows, and including
open air pavilions;
F. Detached garages, storage sheds, or other non-habitable structure(s) without toilet facilities,
accessory to existing buildings that will not block flood flows nor reduce Regulatory Floodway storage;
G. Bridges, culverts and associated roadways, sidewalks and railways, necessary for crossing over the
Regulatory Floodway or for providing access to other appropriate uses in the Regulatory Floodway and
any modification thereto;
H. Parking lots (where the existing depth of flooding for the base flood event is less than one foot) and
aircraft parking aprons both built at or below ground elevation and any modifications thereto;
I. Flood-proofing activities to protect previously existing lawful structures including the construction of
water-tight window wells, elevating structures, or the construction of flood walls around residential,
commercial, or industrial principal structures where the outside toe of the floodwall should be no more
than ten feet away from the exterior wall of the existing structure, and which are not considered to be
substantial improvements to the structure;
Third Edition Stormwater Standards Manual September 2008 Page 126