No land shall be occupied or used, and no building which is
hereafter constructed, altered, added to, modified, repaired, rebuilt,
or replaced shall be occupied until a certificate of compliance is
issued by the Zoning Administrator, except where no permit is required,
subject to the following:
A.
The certificate of compliance shall show that the building or premises
or part thereof, and the proposed use, conform to the provisions of
this chapter.
B.
Application for such certificate shall be concurrent with the application
for a permit.
C.
If all ordinance provisions are met, the certificate of compliance
shall be issued within 10 days after written notification that the
permitted work is completed.
D.
The applicant shall submit a certificate signed by a registered professional
engineer, architect, or land surveyor that the fill, lowest floor,
and floodproofing elevations are in compliance with the permit issued.
A.
Obstructions or increases.
(1)
Obstructions or increases may only be permitted if amendments
are made to this chapter, the official Floodplain Zoning Maps, floodway
lines, and water surface profiles consistent with this section.
(2)
In AE Zones with a mapped floodway, no obstructions or increases
shall be permitted unless the applicant receives a Conditional Letter
of Map Revision from the Federal Emergency Management Agency and amendments
are made to this chapter, the official Floodplain Zoning Maps, floodway
lines, and water surface profiles, consistent with this section. Any
such alterations must be reviewed and approved by the Federal Emergency
Management Agency and the Wisconsin Department of Natural Resources.
(3)
In A Zones increases equal to or greater than 1.0 foot may only
be permitted if the applicant receives a Conditional Letter of Map
Revision from the Federal Emergency Management Agency and amendments
are made to this chapter, the official floodplain maps, floodway lines,
and water surface profiles, consistent with this section.
B.
Generally. The Village Board may change the Floodplain Overlay District
boundaries and the text of this article pursuant to the requirements
and procedures in Article 5. Actions requiring an amendment include,
but are not limited to, the following:
(1)
Any fill or floodway encroachment that obstructs flow causing
any increase in the regional flood height;
(2)
Any change to the floodplain boundaries and/or watercourse alterations
on the Flood Insurance Rate Map;
(4)
Any floodplain fill which raises the elevation of the filled
area to a height at or above the flood protection elevation and is
contiguous to land lying outside the floodplain;
(5)
Correction of discrepancies between the water surface profiles
and floodplain maps;
(6)
Any upgrade to floodplain zoning regulations required by § NR
116.05, Wis. Admin. Code, or otherwise required by law, or for changes
by the municipality; and
(7)
All channel relocations and changes to the maps to alter floodway
lines or to remove an area from the floodway or the floodfringe that
is based on a base flood elevation from a Flood Insurance Rate Map
requires prior approval by the Federal Emergency Management Agency.
C.
Flood easements. A person petitioning for a map amendment that obstructs
flow causing any increase in the regional flood height shall obtain
flooding easements or other appropriate legal arrangements from all
adversely affected property owners and notify local units of government
before the amendment can be approved by the governing body.
A.
Generally. All hydraulic and hydrologic studies shall be completed
under the direct supervision of a professional engineer registered
in the State of Wisconsin. The study contractor shall be responsible
for the technical adequacy of the study. All studies shall be reviewed
and approved by the Wisconsin Department of Natural Resources.
B.
Zone A floodplains. For projects located in a Zone A floodplain,
the following provisions apply:
(1)
Hydrology. The appropriate method shall be based on the standards
in § NR 116.07(3), Wis. Admin. Code, entitled "Hydrologic
Analysis: Determination of Regional Flood Discharge."
(2)
Hydraulic modeling. The regional flood elevation shall be based
on the standards in § NR 116.07(4), Wis. Admin. Code, entitled
"Hydraulic Analysis: Determination of Regional Flood Elevation" and
the following:
(a)
Determination of the required limits of the hydraulic model
shall be based on detailed study information for downstream structures
(dam, bridge, culvert) to determine adequate starting WSEL for the
study.
(b)
Chanel sections must be surveyed.
(c)
Minimum four-foot contour data in the overbanks shall be used
for the development of cross section overbank and floodplain mapping.
(d)
A maximum distance of 500 feet between cross sections is allowed
in developed areas with additional intermediate cross sections required
at transitions in channel bottom slope including a survey of the channel
at each location.
(e)
The most current version of HEC-RAS shall be used.
(f)
A survey of bridge and culvert openings and the top of street
is required at each structure.
(g)
Additional cross sections are required at the downstream and
upstream limits of the proposed development and any necessary intermediate
locations based on the length of the reach if greater than 500 feet.
(h)
Standard accepted engineering practices shall be used when assigning
parameters for the base model such as flow, Manning's N values,
expansion and contraction coefficients or effective flow limits. The
base model shall be calibrated to past flooding data such as high-water
marks to determine the reasonableness of the model results. If no
historical data is available, adequate justification shall be provided
for any parameters outside standard accepted engineering practices.
(i)
The model must extend past the upstream limit of the difference
in the existing and proposed flood profiles in order to provide a
tie-in to existing studies. The height difference between the proposed
flood profile and the existing study profiles shall be no more than
0.00 feet.
(3)
Mapping. A work map of the reach studied shall be provided,
showing all cross section locations, floodway/floodplain limits based
on best available topographic data, geographic limits of the proposed
development and whether the proposed development is located in the
floodway.
(a)
If the proposed development is located outside of the floodway,
then it is determined to have no impact on the regional flood elevation.
(b)
If any part of the proposed development is in the floodway,
it must be added to the base model to show the difference between
existing and proposed conditions. The study must ensure that all coefficients
remain the same as in the existing model, unless adequate justification
based on standard accepted engineering practices is provided.
C.
Zone AE floodplains. For projects located in a Zone AE floodplain,
the following provisions apply:
(1)
Hydrology. If the proposed hydrology will change the existing
study, the appropriate method to be used shall be based on § NR
116.07(3), Wis. Admin. Code, entitled "Hydrologic Analysis: Determination
of Regional Flood Discharge."
(2)
Hydraulic model. The regional flood elevation shall be based
on the standards in § NR 116.07(4), Wis. Admin. Code, entitled
"Hydraulic Analysis: Determination of Regional Flood Elevation" and
the following:
(a)
Duplicate effective model. The effective model shall be reproduced
to ensure correct transference of the model data and to allow integration
of the revised data to provide a continuous flood insurance study
model upstream and downstream of the revised reach. If data from the
effective model is available, models shall be generated that duplicate
the Flood Insurance Study profiles and the elevations shown in the
floodway data table in the Flood Insurance Study report to within
0.1 foot.
(b)
Corrected effective model. The corrected effective model shall
not include any man-made physical changes since the effective model
date, but shall import the model into the most current version of
HEC-RAS for Wisconsin Department of Natural Resources review.
(c)
Existing (preproject conditions) model. The existing model shall
be required to support conclusions about the actual impacts of the
project associated with the revised (post-project) model or to establish
more up-to-date models on which to base the revised (post-project)
model.
(d)
Revised (post-project conditions) model. The revised (post-project
conditions) model shall incorporate the existing model and any proposed
changes to the topography caused by the proposed development. This
model shall reflect proposed conditions.
(e)
All changes to the duplicate effective model and subsequent
models must be supported by certified topographic information, bridge
plans, construction plans, and survey notes.
(f)
Changes to the hydraulic models shall be limited to the stream
reach for which the revision is being requested. Cross sections upstream
and downstream of the revised reach shall be identical to those in
the effective model and result in water surface elevations and top
widths computed by the revised models matching those in the effective
models upstream and downstream of the revised reach as required. The
effective model shall not be truncated.
(3)
Mapping. Maps and associated engineering data shall be submitted
to the Wisconsin Department of Natural Resources for review which
meet the following conditions:
(a)
Consistency between the revised hydraulic models, the revised
floodplain and floodway delineations, the revised flood profiles,
topographic work map, annotated FIRMs and/or Flood Boundary Floodway
Maps, construction plans, bridge plans.
(b)
Certified topographic map of suitable scale, contour interval,
and a planimetric map showing the applicable items. If a digital version
of the map is available, it may be submitted in order that the Flood
Insurance Rate Map may be more easily revised.
(c)
Annotated Flood Insurance Rate Map panel showing the revised
1% and 0.2% annual chance floodplains and floodway boundaries.
(d)
If an annotated Flood Insurance Rate Map and/or Flood Boundary
Floodway Maps and digital mapping data (GIS or CADD) are used, then
all supporting documentation or metadata must be included with the
data submission along with the Universal Transverse Mercator (UTM)
projection and State Plane Coordinate System consistent with mapping
specifications established by the Federal Emergency Management Agency.
(e)
The revised floodplain boundaries shall tie into the effective
floodplain boundaries.
(f)
All cross sections from the effective model shall be labeled
in accordance with the effective map and a cross section lookup table
shall be included to relate to the model input numbering scheme.
(g)
Both the current and proposed floodways shall be shown on the
map.
(h)
The stream center line, or profile baseline used to measure
stream distances in the model shall be visible on the map.
A.
Nonconforming uses. The Zoning Administrator shall maintain a list
of those properties that contain a nonconforming use.
B.
Nonconforming structures. The Zoning Administrator shall maintain
a list of those properties that have a nonconforming structure. For
every such structure, the following information shall be recorded:
In their interpretation and application, the provisions of this
article are the minimum requirements liberally construed in favor
of the Village of Richfield and are not a limitation on or repeal
of any other powers granted by the Wisconsin Statutes. If a provision,
required by Ch. NR 116, Wis. Admin. Code, is unclear, the provision
shall be interpreted in light of the standards in effect on the date
of the adoption of this article or in effect on the date of the most
recent text amendment to this article.
