HomeMy WebLinkAboutMemo - Mail Packet - 4/14/2020 - Memorandum From Ken Sampley And Heidi Hansen Re: Notification Of Revised 100-Year Floodplain For The Canal Importation Basin1 of 1
Utilities
electric • stormwater • wastewater • water
700 Wood St.
PO Box 580
Fort Collins, CO 80522
970.221.6700
970.221.6619 fax • 970.224.6003 TDD
utilities@fcgov.com • fcgov.com/utilities
DATE:
TO:
THROUGH:
FROM:
RE:
March 12, 2020
Mayor Troxell and Councilmembers
Darin Atteberry, City Manager
Jeff Mihelich, Deputy City Manager
Kevin Gertig, Utilities Executive Director
Theresa Connor, Deputy Director, Water Engineering & Field Services
Ken Sampley, Director, Civil Engineering
Heidi Hansen, Civil Engineer III, Water Utility Engineering Division
Notification of revised 100-year floodplain for the Canal Importation Basin.
Informational Item: This is provided for informational purposes; no action is required by Council.
Background and Project Purpose
A new floodplain and floodway based on the design and construction of the Pedestrian Underpass at the
intersection of Shields and Elizabeth Streets has been adopted by the City of Fort Collins Utilities. The
purpose of the project was to provide safe and efficient pedestrian and bike travel under Shields Street.
The underpass was constructed by Colorado State University.
The pedestrian underpass is located in Section 15 of Township 7N, Range 69W, southwest of the
intersection of Shields Street and Elizabeth Street in Fort Collins. This update is only related to the City-
regulated Canal Importation Basin.
Due to more detailed mapping, one structure was newly mapped into the floodplain and the floodplain
expanded on 5 properties. These changes were not due to the project, but simply due to more detailed
topography and more accurate modeling and mapping. Attached is the approval letter and maps of the
floodplain revisions showing the current regulatory floodplain, existing risk, and post project floodplain.
Citizen Notification
Fort Collins Utilities will be notifying citizens of the impact this project has on their properties and
residences. A personalized letter with map inserts detailing current regulatory, existing risk, and post
project floodplains will be sent to each owner and resident.
Attachments:
1. Map approval letter including revised maps
DocuSign Envelope ID: 6E9AF910-D60D-4C96-B47D-EB4E2542A4A7
1 of 2
Utilities
electric • stormwater • wastewater • water
700 Wood St.
PO Box 580
Fort Collins, CO 80522
970.221.6700
970.221.6619 – fax x 970.224.6003 TDD
utilities@fcgov.com x fcgov.com/utilities
DATE:
TO:
THROUGH:
FROM:
RE:
February 1ϵ, 2020
Kevin Gertig, Utilities Executive Director
Theresa Connor, Deputy Director, Water Engineering & Field Services
Ken Sampley, Director, Civil Engineering
Heidi Hansen, Civil Engineer III, Water Utility Engineering Division
Daniel Evans, Civil Engineer III, Water Utility Engineering Division
Updated Floodplain Map Approval for Canal Importation Basin
Background and Project Purpose
In 20ϭϰ, City Council adopted the current Canal Importation Stormwater Master Plan for the
City of Fort Collins and it is referenced in City Code Section 10-19(b).
In 2019, Ayres Associates updated the floodplain and floodway along West Elizabeth Street
based on the design and construction of the pedestrian underpass at the intersection of Shields
and Elizabeth Street. The pedestrian underpass is located in Section 15 of Township 7N, Range
69W, southwest of the intersection of Shields Street and Elizabeth Street in Fort Collins. The
purpose of the project was to provide safe and efficient pedestrian and bike travel under
Shields Street. The underpass was constructed by Colorado State University. This update is only
related to the City-regulated Canal Importation Basin.
Due to more detailed mapping, one structure was newly mapped into the floodplain and the
floodplain expanded on 5 properties. These changes were not due to the project, but simply
due to more detailed topography and more accurate modeling and mapping. Attachment 2 are
maps of the floodplain revisions showing the current regulatory floodplain, the existing risk,
and post project floodplain. The addendum report is on file and shall be maintained by the
office of the Utilities Executive Director.
DocuSign Envelope ID: 6E9AF910-9804E77B-1622-D60D-4C14-4C96-80CB-B47D-3AE2717319F3 EB4E2542A4A7
2 of 2
Floodplain Map Approval Recommendation
In reference to the adoption of updates and refinements to the floodplain or floodway mapping
that modify the currently existing floodplain mapping, City Code Section 10-19(b) states:
. . . To the extent that additional technical analysis results in the refinement of the
floodplain, flood fringe, floodway, erosion buffer zone or other delineations contained in the
plans listed below, or to the extent that the completion of a capital improvement project
results in a modification of any such delineations, the Utilities Executive Director shall,
pursuant to his or her duties as set forth in Paragraph 10-26(9), document the associated
change in the delineation, which modified delineation shall control the application of the
requirements set forth in this Article. A copy of the studies or reports shall be on file in the
permanent records of Utility Services. Documentation of any modification of any delineation
pursuant to this Subsection shall be on file in the permanent records of Utility Services.
The floodplain/floodway update presented with this memorandum is considered an update to
the adopted map based on policies and design criteria adopted by City Council. Therefore, we
recommend approval of the updated Canal Importation Floodplain Map, and the application of
City Code 10-19(b) to this floodplain map.
_________________________________________
Civil Engineer III
_________________________________________
Civil Engineer III
_________________________________________
Director, Civil Engineering
_________________________________________
Deputy Director, Water Engineering &
Field Services
Floodplain Map Approval
By signature, the Utilities Executive Director has determined the Pedestrian Underpass at the
intersection of Shields Street and Elizabeth Street of the Canal Importation Basin flood risk area
does not diminish the purpose and objectives of the existing master plan and does address the
disposition of stormwater runoff in the basin. The floodplain update and mapping will be kept
on file (as stated above) in the office of the Utilities Executive Director upon approval.
APPROVED BY:
______________________________________________________________________________
Fort Collins Utilities Executive Director Date
DocuSign Envelope ID: 9804E77B-1622-4C14-80CB-3AE2717319F3
W ELIZABETH ST
Printed: February 12, 2020
W LAUREL ST
S SHIELDS ST
W ELIZABETH ST
W ELIZABETH ST
W ELIZABETH ST W ELIZABETH ST
Current Regulatory, Existing Risk, Post Project:
Current Regulatory: Existing Risk*: Post Project:
Legend
Proposed Floodway
Proposed Floodplain
Existing Risk Floodway
Existing Risk Floodplain
Current Floodway
Current Floodplain
Current 0RGHUDWH5LVN Floodplain
Parcels
0 87.5 175 350 525 Feet
0 90 180 360 540 Feet 0 90 180 360 540 Feet 0180360540 90 Feet
±
This information is based on the Federal Emergency Management
Agency (FEMA) Flood Insurance Rate Map (FIRM) and the City of
Fort Collins Master Drainageway Plans. This letter does not imply
that the referenced property will or will not be free from flooding or
damage. A property not in the Special Flood Hazard Area or in a
City Designated Floodplain may be damaged by a flood greater
than that predicted on the map or from a local drainage problem
not shown on the map. This map does not create liability on the
part of the City, or any officer or employee thereof, for any damage
that results from reliance on this information.
* Existing risk map based on
updated topography and modeling.
The 100-year floodplain is the area that has been determined to have
a 1% chance in any given year of being flooded. The floodway is the
area within the floodplain with the greatest depths and fastest
velocities. All development within the 100-year floodplain and
floodway must comply with Chapter 10 of the City of Fort Collins
Municipal Code.
Please call Heidi Hansen at (970) 221-6854 if you have any
questions.
Attachment 2: Floodplain Revisions
**If not shown on map, proposed risk
overlaps existing risk.
DocuSign Envelope ID: 9804E77B-1622-4C14-80CB-3AE2717319F3
DocuSign Envelope ID: 6E9AF910-D60D-4C96-B47D-EB4E2542A4A7
S SHIELDS ST
W ELIZABETH ST
Printed: February 12, 2020
S SHIELDS ST
W LAUREL ST
W ELIZABETH ST
S SHIELDS ST
W ELIZABETH ST
S SHIELDS ST
W ELIZABETH ST
S SHIELDS ST
W ELIZABETH ST
Current Regulatory, Existing Risk, Post Project:
Current Regulatory: Existing Risk*: Post Project:
Legend
Proposed Floodway
Proposed Floodplain
Existing Risk Floodway
Existing Risk Floodplain
Current Floodway
Current Floodplain
Current 0RGHUDWH5LVN Floodplain
Parcels
0 87.5 175 350 525 Feet
0 90 180 360 540 Feet 0 90 180 360 540 Feet 0180360540 90 Feet
±
This information is based on the Federal Emergency Management
Agency (FEMA) Flood Insurance Rate Map (FIRM) and the City of
Fort Collins Master Drainageway Plans. This letter does not imply
that the referenced property will or will not be free from flooding or
damage. A property not in the Special Flood Hazard Area or in a
City Designated Floodplain may be damaged by a flood greater
than that predicted on the map or from a local drainage problem
not shown on the map. This map does not create liability on the
part of the City, or any officer or employee thereof, for any damage
that results from reliance on this information.
* Existing risk map based on
updated topography and modeling.
The 100-year floodplain is the area that has been determined to have
a 1% chance in any given year of being flooded. The floodway is the
area within the floodplain with the greatest depths and fastest
velocities. All development within the 100-year floodplain and
floodway must comply with Chapter 10 of the City of Fort Collins
Municipal Code.
Please call Heidi Hansen at (970) 221-6854 if you have any
questions.
Attachment 2: Floodplain Revisions
** If not shown on map, proposed risk
overlaps existing risk.
DocuSign Envelope ID: 9804E77B-1622-4C14-80CB-3AE2717319F3
DocuSign Envelope ID: 6E9AF910-D60D-4C96-B47D-EB4E2542A4A7
DocuSign Envelope ID: 6E9AF910-D60D-4C96-B47D-EB4E2542A4A7