2019-06-12 CC Minutes p ° City of Farmers Branch Farmers Branch City Haallll
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Farmers Branch,Texas
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FARMERS Meeting Minutes
BRANCH
City Council
Wednesday,June 12,2019 5:00 PM Study Session Room
Special Called City Council Meeting
A. CALL TO ORDER - (5 P.M.)
Presiding: 1 - Mayor Robert Dye
Present: 10- Mayor Pro Tern John Norwood, Deputy Mayor Pro Tern Terry Lynne, Council
Member Mike Bomgardner, Council Member Cristal Retana, Council Member
Bronson Blackson,
Staff: 9- City Manager Charles Cox, Deputy City Manager John Land, City Secretary
Amy Piukana, City Attorney Peter G. Smith, Director of Public Works Marc
Bentley, Assistant City Manager Benjamin Williamson, Director of
Sustainability & Health Shane Davis, Fire Chief Steve Parker, Director of
Communications Tom Bryson
B. REGULAR AGENDA ITEM
Mayor Dye called the Special meeting to order at 5 p m.
B.1 19-268 Discussion of improvements and maintenance related to Farmers
Branch creeks; and take appropriate action
Freese and Nichols Senior Project Manager Mr David Rivera and Professional Engineer
John Rutledge provided an update and review of Farmers Branch Creek. Mr. Rivera
reviewed the background and initial study, event timeline, design and construction of
emergency solutions, and long-term design options He explained the flood risk prior to
September 2018 in a 100-year flood zone was 61 homes. He also reviewed the
Farmers Branch Watershed Study CIP project-ranking sheet.
Mr Rivera provided three options for City Council to consider.
Option A-Large Single Dam
• Scope - Complete drop structure to protect sanitary sewer line, repairs to Dam
#1, Restore Dam #3 to original 14 ft height, localized and reach scale bank
stabilization
• Time- Design and Construction - 1.5 years, Permitting-6 months to 2 years
• Cost-$5,600(does not include current improvements)
• Maintenance - High long term maintenance. Easement acquisition will be
required and dredging program is required with 5 year intervals.
• USACE - Nationwide Permits with Pre-Construction Notification, or standard
Individual
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City Council Meeting Minutes June 12,2019
• Permit(IP)
• Flood Risk- Increases flood risk to Pre-September 2018 levels(highest risk
level)
• Erosion Risk-Provides localized long-term protection against erosion and
restored pool levels provide additional erosion protection —
Option B-Multiple Step Pools
• Scope - Complete drop structure to protect sanitary sewer line and convert to
low water dam, repairs to Dam #1, Restore Dam #3 to lower height of 6 ft,
localized and reach scale bank stabilization
• Time - Design and construct in 1 5 years with permitting within 6 months to 2
years.
• Cost-$4,700,000(Does not include current Improvements)
• Maintenance - High long-term maintenance with easement acquisition will be
required Dredging program is required with 5-year intervals.
• USACE-Request waiver of NWP 13 linear foot and volume limits for reach scale
bank stabilization, but USACE could require standard individual permit.
• Flood Risk - Flood risk lower than pre-September 2018 levels, but higher than
current condition
• Erosion Risk - Provides localized long-term protection against erosion
Restored pool level provides additional erosion protection
Option C -Stable Stream
• Scope - Complete drop structure to protect sanitary sewer line and repairs to
Dam#1 with localized and reach scale bank stabilization.
• Time - Design and Construction within 1 year with permitting within 6 to 18
months.
• Cost-$3,200,000(does not include current improvements)
• Maintenance - Initial moderate maintenance to establish vegetation with low
maintenance requirements. Easement acquisition will be required
• USACE - Request waiver of NWP 13 Linear foot and volume limits for reach
scale bank stabilization but USACE could require standard individual permit.
• Flood Risk-Maintains current flood risk.
• Erosion Risk - Provides localized long-term protection against erosion Reach
scale bank stabilization provides additional erosion protection.
The City Council discussed the following topics. bag walls, flooding, erosion, old survey
verses existing creek conditions, storm water runoff control, percentage of water runoff
from Addison (20%) verses city drainage into the creeks, 40 acre requirement to
construct a detention pond (no land available), culverts, water detention under parking
areas, easements and ways to redirect the creek flow.
City Engineer Marc Bentley recommended a master drainage plan, noting once we have
identified existing drainage, we can address and contain water runoff in strategic
locations.
Mr. Cox provided a presentation on private property verses public property laws, timing
and steps, ownership of easements, ongoing maintenance, and funding sources. He
explained an option to allow Creek property owners to share in costs such as creating a
Public Improvement District(PID)or HOA.
Council Member Bomgardner stated he feels the City should own and maintain the dam,
noting with this type of investment, property owners may be unable to maintain
Mayor Dye recessed for a break at 7.19 p.m
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City Council Meeting Minutes June 12,2019
C. EXECUTIVE SESSION
Mayor Dye reconvened into closed Executive Session at 7 35 p.m. pursuant to Texas
Government Code Section 551 071(2) for the purpose of seeking confidential legal
advice from the City Attorney
D. TAKE ANY ACTION NECESSARY AS A RESULT OF THE CLOSED EXECUTIVE
SESSION
Mayor Dye reconvened into regular session at 8 16 p m.
The consensus of City Council was that City Administration move forward with obtaining
a second opinion (Independent Audit)on Farmers Branch Creek and discuss this item at
the next City Council meeting set for June 18, 2019
E. ADJOURNMENT
Mayor Dye motioned to adjourn. Motion seconded by Mayor Pro Tem Norwood. Motion
approved by unanimous vote
The meeting adjourned at 8:22 p m
I1.
Mayor Robert C Dye
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City Secretary
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