HomeMy WebLinkAboutMASON STREET SUSTAINABLE DEVELOPMENT - FDP - FDP140020 - CORRESPONDENCE - STORMWATER-RELATED DOCUMENTSCity of Fort Collins Floodplain Review Checklist
100% Development Review Submittals
Instructions: Complete this checklist by marking all boxes that have been adequately
completed. Put an “NA” next to any items that are not applicable to this particular
submittal. Any boxes that are left blank and do not have an “NA” marked next to them
are considered incomplete.
Date of Review:_____________ Reviewer’s Name:____________________________
Plat Map
The following required items are on the plat:
100-year floodplain boundary
City
FEMA
Floodway boundary
City
FEMA
The benchmark number and elevation of benchmark
These items match the FIRM. (FEMA Basin)
These items match the Master Plan. (City Basin)
The benchmark number and elevation match with those published in the City of Fort
Collins benchmark system.
Site Plan
The following required items are on the site plan:
100-year floodplain boundary- FEMA and City
500-year floodplain boundary (if proposed structure is a “critical facility”
and a 500-year floodplain is mapped)
Floodway boundary
Erosion buffer zones
Restrictions related to use (ie. critical facility or no residential use of lower
floor if floodproffed mixed use structure)
Drainage and/or Grading Plan (or a separate Floodplain Sheet if it is too cluttered on
Drainage and Grading Plan)
The following required items are on the drainage and/or grading plan:
100-year floodplain boundary- FEMA and City
500-year floodplain boundary (if proposed structure is a “critical facility”
and a 500-year floodplain is mapped)
Floodway boundary
Erosion buffer zones
Cross-section locations
BFE lines
Lowest floor elevation of structures (bottom of basement or crawl space is
considered the lowest floor)
The floodplain and floodway boundaries are in the correct location and labeled
properly.
The cross-section and BFE lines are in the correct location and labeled properly.
Elevations are referenced to the appropriate datum:
FEMA basins – list in both NGVD 29 and NAVD 88
City basins – list only in NGVD 29
Floodway regulations have been met.
No fill in the floodway unless a hydraulic analysis shows “no-rise”.
No manufactured homes, except in an existing park, can be placed in the
floodway.
No changing a nonconforming non-residential or mixed use structure to a
residential structure.
Landscaping meets requirements for no encroachment in the floodway
without a hydraulic analysis to show “no-rise”.
No storage of materials or equipment.
A note is on the plans about the above floodway restrictions.
Critical facilities regulations have been met:
100 year – no life safety, emergency response or hazardous material
critical facilities
500 year Poudre – no life safety or emergency response critical facilities
Any pedestrian bridges in the floodway that are not able to pass the 100-year flow are
designed to be “break-away”.
Fences in the floodway will not block conveyance. Example: split-rail fence cabled
together to not float, flap at bottom of privacy fence to allow water through (flap at
BFE or above).
Any items in the floodway that can float (Example: picnic tables, bike racks, etc.) are
noted as being anchored.
Erosion Buffer Zone requirements have been met:
Design of any allowed development minimizes disturbance to channel bed
and banks.
No structures allowed.
No additions to existing structures allowed.
Any fencing is split-rail design and break-away, but cabled. Must be
oriented parallel to general flow direction.
No detention or water quality ponds.
No bike or pedestrian paths or trails except as required to cross streams or
waterways.
Road, bicycle and pedestrian bridges must span erosion buffer zone.
No fill.
No outdoor storage of non-residential materials or equipment.
No driveways or parking areas.
No irrigated vegetation and non-native trees, grasses, or shrubs.
No utilities except as necessary to cross streams or waterways.
No grading or excavation except as required for permitted activities in
erosion buffer zone.
No construction traffic except as required for permitted activities in
erosion buffer zone.
Any construction in the erosion buffer zone shows that it will not impact
the channel stability.
A note is on the plans about the above erosion buffer zone restrictions.
Any necessary floodplain modeling has been submitted and approved. All modeling
must follow the City’s floodplain modeling guidelines.
Special Poudre River Regulations
Poudre River Floodway Regulations have been met.
No construction of new residential, non-residential or mixed-use
structures.
No redevelopment of residential, non-residential or mixed-use structures.
No additions to residential, non-residential or mixed-use structures.
No fill unless hydraulic analysis shows “no-rise”.
Poudre River floodplain regulations have been met
No construction of new residential or mixed-use structures
No additions to residential structures
No additions to mixed-use structures if there is an expansion in the
residential-use area of the structure.
No floatable materials on non-residential sites
Information Related to Structures in the Floodplain
For structures in the floodplain, a table is shown that lists the following:
City BFE at upstream end of structure
FEMA BFE at upstream end of structure (if different than City BFE)
Regulatory flood protection elevation
Lowest floor elevation (bottom of basement or crawl space is considered
lowest floor)
Floodproofing elevation for non-residential structures (if applicable)
Garage slab elevation
HVAC elevation
The BFE at upstream end of structures are correct based on interpolation between the
cross-sections.
The regulatory flood protection elevation is correct.
The lowest floor and HVAC are at or above the regulatory flood protection elevation.
Elevations are referenced to the appropriate datum:
FEMA basins – list in both NGVD 29 and NAVD 88
City basins – list only in NGVD 29
A typical drawing detail is included for each foundation type proposed (slab-on-
grade, basement, crawl space) showing the elevation of the HVAC and lowest floor
elevation (which includes bottom of the basement or crawl space) relative to the BFE.
If garage is not elevated to the regulatory flood protection elevation, then a drawing
detail is included showing vent placement, size, and number.
There is 1 square inch of venting for every 1 square foot of enclosed area.
The bottom of the venting is not higher than 1 foot above grade.
The venting is on at least two sides, preferably on upstream and
downstream sides. (Does not have to be divided equally).
If a non-residential structure is to be floodproofed, one of these conditions is met:
All requirements on separate sheet titled “Floodproofing Guidelines” have
been met.
If floodproofing information is not submitted as part of the plans, then a
note is on the plans stating that floodproofing information will be
submitted at the time of the building permit application.
For manufactured homes, all submittal requirements on separate sheet titled
“Installation of a Mobile Home Located in a Floodplain: Submittal Requirements”
have been met.
If the floodplain use permit is not going to be submitted until the building permit is
applied for, then a note is on the plans stating that the floodplain use permit will be
submitted at the time of building permit application.
A note is on the plans stating that a FEMA elevation or floodproofing certificate will
be completed and approved before the CO is issued. This is required even if property
is only in a City floodplain.
Drainage Report
The site is described as being in the floodplain. Floodplain name and if the floodplain
is a FEMA or City-designated is described. Any floodway or erosion buffer zones on
the site are described.
The FEMA FIRM panel # and date and/or the Master Plan information is cited.
A copy of the FIRM panel with the site location marked is included in the report.
If a floodplain modeling report has been submitted, that report is referenced. The
reason for the floodplain modeling report is described.
If a FEMA CLOMR or LOMR has been approved for the site, the case number is
referenced. The reason for the CLOMR or LOMR is described.
If a FEMA LOMR is required after construction, this is stated in the report.
The location of the structures relative to the floodplain is described. If there is both a
FEMA and a City floodplain on the site, the location of the structures relative to both
is described.
The use of the structures is described. This is to determine if the structure is
residential, non-residential, or mixed-use. Also, structures in all 100-year and Poudre
River 500-year floodplains cannot be used as a critical facility. (See Chapter 10 of
City Code for definitions.)
The report describes how the development is in compliance with the applicable
floodplain regulation (Chapter 10 of City Code). (Examples: elevation of lowest floor
above regulatory flood protection elevation, floodproofing, floodway regulation,
erosion buffer zone regulation, no-rise, etc.)
The type of foundation construction for the structures (i.e. slab-on-grade, crawl space,
basement, etc.) is discussed in the report.
The type of foundation matches with the lowest floor elevations and grading plan.
If any of the garages are not going to be elevated above the regulatory flood
protection elevation, the hydraulic venting requirements are discussed.
For structures in the floodplain, a table is included (same table as on the
Drainage/Grading Plan) that lists the following:
City BFE at upstream end of structure
FEMA BFE at upstream end of structure (if different than City BFE)
Regulatory flood protection elevation
Lowest floor elevation (bottom of basement or crawl space is considered
lowest floor)
Floodproofing elevation for non-residential structures (if applicable)
Garage slab elevation
HVAC elevation
Elevations are referenced to the appropriate datum:
FEMA basins – list in both NGVD 29 and NAVD 88
City basins – list only in NGVD 29
If the floodplain use permit is not going to be submitted until the building permit is
applied for, then a note must be included in the report that states the permit will be
submitted at the time of building permit application.
If floodproofing information is not submitted as part of the plans, then a note must be
in the report stating that floodproofing information will be submitted at the time of
the building permit application.
A note is in the report stating that a FEMA elevation or floodproofing certificate will
be completed and approved before the CO is issued.
In the compliance section, Chapter 10 of City Code is listed.
Floodplain Use Permit
Floodplain Use Permit has been submitted for each structure.
Permit fee has been submitted
All information on permit matches the plans
All information on permit meets floodplain regulations
FEMA CLOMR Approval
FEMA has approved any necessary CLOMRs.
Additional Comments:
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Terms to Note
Lowest Floor Elevation – Elevation of the lowest floor of the lowest enclosed area
(including bottom of basement or crawlspace). This is not the same as finished floor. The
lowest floor should be distinguished from finished floor on plans and reports.
Regulatory Flood Protection Elevation – For all floodplains except the Poudre River, the
regulatory flood protection elevation is eighteen (18) inches above the base flood
elevation. For the Poudre River floodplain, the regulatory flood protection elevation is
twenty-four (24) inches above the base flood elevation. If there is both a FEMA and a
City BFE, the higher BFE should be used to determine the regulatory flood protection
elevation.
Additional floodplain terminology is defined in Chapter 10 of City Code.
NOTE: Issues specific to individual sites may arise that result in additional
requirements. These will be discussed during initial meetings with the applicant.