HomeMy WebLinkAbout08-10-20 Drainage and Flooding Committee Meeting Minutes JAY MARTINa. --` O CHUCK ENGELKEN
Chairman Member
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DANNY EARP STEVE GILLETT
Vice-Chairman c" Alternate Member
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MINUTES OF THE DRAINAGE AND FLOODING COMMITTEE MEETING
AUGUST 10, 2020
The Drainage and Flooding Committee of the City of La Porte met on Monday, August 10, 2020,
at the City Hall Council Chambers, 604 West Fairmont Parkway, La Porte, Texas, at 5:00 p.m. to
consider the following items of business:
Committee Members present: Jay Martin, Chuck Engelken, Danny Earp
Committee Members attending remotely: None
Committee Members absent: None
Council-appointed officers present: Corby Alexander, City Manager; Lee Woodward, City Secretary
1. CALL TO ORDER - Chairman Martin called the meeting to order at 5:00 p.m.
2. CITIZEN COMMENT (Generally limited to five minutes per person, in accordance with state law, the
time may be reduced if there is a high number of speakers or other considerations.)
There were no citizen comments.
3. STATUTORY AGENDA
(a) Presentation, discussion, and possible action to approve the July 13, 2020, meeting
minutes. [Jay Martin, Chair]
Committee member Engelken moved to approve the minutes; Member Earp seconded the motion
and it was adopted, 3-0.
(b) Presentation, discussion, and possible action regarding changes to drainage criteria
recommended by Harris County. [Lorenzo Wingate, Assistant Director of Public Works]
Mr. Wingate discussed the new Harris County requirements and their potential impact on the City
(chart from packet below). Alisa Max, P.E., Chief Operations Officer, Harris County Engineering
Dept., answered questions from the Committee. Member Earp asked that the City requirement
for detention for the entire property size be brought back for consideration. Mr. Wingate noted
that Harris County has offered to have their consultant come to La Porte to provide impact analysis
to show how the Harris County proposed changes compare to current City requirements.
Harris County Requirement Impact to La Porte
Atlas 14 rainfall rates to size storm water Minimal impact. Systems are
conveyance and detention systems designed using current rainfall
characteristics.
Increases detention volume
0.55 ac-ft/ac detention rate
requirement by 22%.
Prohibit detention design using hydrograph Minimal impact. Rarely used for
timing design in COLP.
No net fill in the current 500-yrfloodplain To be explained by HCFCD/EHRA.
Finished floor elevation established at or
waterproofed to the 500-yr flood elevation To be explained by HCFCD/EHRA.
August 10, 2020-Drainage and Flooding Committee Minutes
(c) Presentation, discussion, and possible action regarding prioritization of current and future
drainage projects. [Lorenzo Wingate, Assistant Director of Public Works]
Mr. Wingate provided a list of current projects for the Committee to prioritize or add to. The current
list is:
Priority Project Name Project Phase (% Complete) Total
Complete
1 Brookglen Drainage Improvements Feasibility (0%) 0%
2 Bayside Terrace Drainage Feasibility (85%) 30%
Improvements
3 F101-06-00 Improvements Preliminary Engineering (25%) 25%
4 Little Cedar Bayou (F216) Phase 3 Preliminary Engineering (0%) 10%
5 6th Street(North Side Neighborhood Design (5%) 5%
Drainage Improvement Project)
6 Southside Neighborhood Drainage Final Design (90%) 60%
Improvements;
7 Bob's Gully Analysis Project Complete 100%
Mr. Wingate noted Bay Colony has basically been dealt with since the list was put together and
the Committee agreed to flip the order of Mission Drive and Sylvan Beach on the remaining list
(below), thereby prioritizing additional drainage projects for future consideration.
Priority Project Name Project Background
This would be a continuation of previously
completed drainage improvements along the
8 Battleground Estates F101-00-00 drainage channel to mitigate flooding
Phase II north of N P Street with the Battleground Estates
subdivision. Project is prefunded; $65,000 for
preliminary design.
Several complaints received about street flooding
9 Roseberry Drive Drainage along Roseberry. The Drainage Committee
Improvements consented to further evaluation of the Roseberry
drainage system at the August 12, 2019 meeting.
Storm sewer system within Monument Estates
11 Mission Drive Drainage subdivision holds water because conveyance
Improvements channel between N P and N L has not been
maintained.
Subdivision do not have roadside ditches or
10 Sylvan Beach Subdivision enclosed drainage system. All drainage is
Drainage Improvements conveyed along street surface. Roadway is
flooded during moderate rain events.
Inconsistent pipe sizes and elevations create
N/A Dr, nage Improvements
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(d) Presentation, discussion, and possible action in connection with receipt of a report
regarding the Harris County Flood Control District's (HCFCD) and Harris County Precinct
2's current and future plans relating to flooding in the City of La Porte. [Lorenzo Wingate,
Assistant Director of Public Works]
William Conlan of Lockwood, Andrews, & Newnam, a consultant for Harris County Flood Control
District, and project manager for the Galveston Bay Watershed Planning Project, discussed the
completed evaluation and remaining challenges for related to the F212-00-00 channel.
August 10, 2020-Drainage and Flooding Committee Minutes
(e) Presentation, discussion, and possible action regarding the status of current drainage
projects. [Lorenzo Wingate, Assistant Director of Public Works]
Mr. Wingate referred to status changes on several projects. He said he was waiting on proposals
for Little Cedar Bayou Phase Ill and Battleground Estates Phase II, and that a notice to proceed
would be issued tomorrow on the airport project.
(f) Presentation, discussion, and possible action to provide staff with direction, if necessary,
regarding additional drainage concerns. [Lorenzo Wingate, Assistant Director of Public
Works
There were no additional items.
4. Set next meeting - The next meeting date was set for September 14, 2020.
5. Committee Member Comments —There were no comments.
ADJOURN —The meeting was adjourned without objection at 5:50 p.m.
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-- oodward, City Secretary
August 10, 2020 -Drainage and Flooding Committee Minutes