HomeMy WebLinkAbout02-28-11 Drainage and Flooding Committee minutes MINUTES OF THE DRAINAGE AND FLOODING COMMITTEE
February 28, 2011
1. Call to Order
The meeting was called to order by Chairman Mike Mosteit at 5:00 p.m.
Committee Members Present: Chairman Mike Mosteit, Vice Chairman Mike Clausen,
Members Chuck Engelken, John Zemanek and Alternate Member Daryl Leonard.
Committee Members Absent: None
Other Council members Present: None
Members of City Employees Present: City Manager Ron Bottoms, Assistant City Manager
Traci Leach, City Secretary Patrice Fogarty, Secretary III Robin Eldridge, Fire Marshal Clif
Meekins, Senior City Engineer Julian Garza, Planning Director Tim Tietjens, Assistant City
Secretary Sharon Harris, Assistant Public Works Director Don Pennell, and City Engineer
Rodney Slaton.
Others Present: Richard Winn, Phillip Hoot, Philip Topek, Karen Rigby, Robert Eldridge,
John Randolph, Dottie Kaminski, Shawn Bradstreet, Leslie Guzman and Brad Paschal.
2. Consider approval of Minutes of the Drainage and Flooding Committee Meeting held on
November 1, 2010 — P. Fogarty
Motion was made by Committee Member Engelken to approve the minutes as presented.
Second by Committee Member Leonard. The motion carried unanimously.
Ayes: Mosteit, Clausen, Engelken and Zemanek
Nays: None
Abstain: None
Absent: None
3. Receive Presentation of Proposed Partnership Project List to be submitted to Harris
County Flood Control District and discuss process for selection of consultant J. Garza
Senior Engineer Julian Garza and Planning Director Tim Tietjens presented a Proposed
Partnership Project List for submission to Harris County Flood Control District and
discussed selection process of consultants for projects.
The committee directed staff to provide more information on cost estimates and prioritizing
of projects at the next meeting. In addition, staff was also directed to provide large printed
maps for easier viewing.
4. Receive status report of Brookglen Detention Pond Project — J. Garza
Senior City Engineer Julian Garza provided a status report of the Brookglen Detention
Pond Project.
5. Receive status report of De- silting Ditches Project — J. Garza
Minute of Drainage and Flooding Committee Meeting held on February 28, 2011
Senior City Engineer Julian Garza provided a report on the De- silting Ditches Project.
6. Set date for next Drainage and Flooding Committee Meeting
The committee set the date for the next Drainage and Flooding Committee Meeting for
March 7, 2011 at 6:00 p.m.
7. Committee Comments
The committee suggested staff knock on doors and talk to residents in regard to drainage
projects.
8. Executive Session - pursuant to provision of the Open Meetings Law. Chapter 551 Texas
Government Code, Sections 551 -071 through 551.076, 551.087 (consultation with
attorney, deliberation regarding real property, deliberation regarding prospective gift or
donation, personnel matters, deliberation regarding security devices, or excluding a
witness during examination of another witness in an investigation, deliberation regarding
Economic Development Negotiations.)
9. Consideration and possible action on items considered in executive session.
There was no executive session.
10. Adjournment
There being no further business to . come before the Committee, the meeting was
adjourned at 6:00 p.m.
R ectfully
a
City Secreta ry
Approved this 7th day of March 2011.
Chairperson Mike Mosteit
p
REQUEST FOR DRAINAGE COMMITTEE AGENDA ITEM
Appropriation
Agenda Date Requested: March 7, 2011
Source of Funds: N/A
Requested By: Julian Garza
Account Number: N/A
Department: Planning
Amount Budgeted: N/A
Report: X Resolution: _Ordinance:
Amount Requested: N/A
Exhibit: Certificate of Obligation Balance Sheet Budgeted Item: _YES NO
Exhibit: Current and Future Project List
Exhibit: List of Proposed Improvements
Exhibit: Completed and Current Drainage Projects
Exhibit: Future Drainage Projects
Exhibit: 11 Proposed Improvements
Exhibit: Funds Available for Future Projects
SUMMARY
The Certificate of Obligation Balance Sheet is showing approximately $3.9M of funds available for
design and construction of future drainage projects. The Current and Future Project List shows that of the
$3,900,000 available, approximately $2,014,000 is committed to current projects leaving approximately
$1,886,000 for future projects as shown on the Remaining Certificate of Obligation Funds exhibit.
Action Required by Council:
Provide Staff with direction for future project expenditures.
A • s roved for Ci C uncil A ' enda
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Funds Available for Future Projects
Current Funds Available from Balance Sheet $3,900,000
Current Projects Estimated Cost $2,014,000
Estimate of Remaining Funds Available $1,886,000
Future Projects Summary Of Cost
Third Street $5,000
Adams Street $40,000
North and South Shady Lane $40,000
Battleground Estates $849,000
Shady River $361,000
Subtotal Future City of La Porte Projects $1,295,000
Future Projects to be Considered for HCFCD 100% Participation
PER for B112 Channel Improvements and Mitigation Pond Estimated at $3M $25,000
PER for F101 Re- direction of Flow with Detention Estimated at $4.5M $150,000
Subtotal PER cost for HCFCD Participation Projects $175,000
Total Future Project and PER Estimate $1,470,000
Meeting Handout
klotz*associates
Date: August 30, 2010
Re- analysis of Drainage Impacts to 8106 -02 -00 and B106 -00 -00
Drainage Improvements for Fairmont Park East
City of La Porte, Texas
Key Map 579C; Pct 2
HCFCD Project No. 2005922, Unit B106 -02 -00
Klotz Associates Project No. 0127.012.001
Background and Purpose
Fairmont Park East (FPE), which includes approximately 110 acres of land, is bordered on its
south side by stream B106-02-00 and on its west side by a pipeline right-of-way and Old
Hickory Drive (see Exhibit 1). B106 -02 -00 empties into Big Island Slough (B106- 00 -00) at a
point approximately 3,500 feet downstream of Fleetwood Drive, the outfall point for runoff from
the FPE development.
Under pre - project conditions, runoff from the development empties into B106-02-00 through a
single outfall pipe. Under post - project conditions, an enlarged outfall pipe and a swale will be
added, thereby increasing flows into the stream. The outfall location will be the same between
pre - and post- project conditions. The differences between the outfall hydrographs between pre-
and post - project conditions were described in our December 2009 report.
The purpose of the analysis described below was to determine the impact of the proposed
drainage improvements on flows within streams B 106 -02 -00 and B106- 00 -00. This analysis
replaces the draft results that were presented during an August 10, 2010 meeting at HCFCD.
Analysis
The HEC -HMS hydrologic model from TSARP was used for the analysis. TSARP subbasin
B106C was divided into seven (7) subareas with FPE being one of the subareas. For subareas C1
thru C6, unit hydrograph parameters TC and R were calculated and input into HEC -HMS to
compute runoff hydrographs. For the FPE subarea, hydrographs were taken from the XP-
SWMM models described in our December 2009 report. For consistency with the hydrographs
from XP -SWMM, and unlike TSARP procedures, storm peak centers in HEC -HMS were set at
50% compared to the typical 67% used in TSARP procedures. Exhibit 2 shows the resulting
HEC -HMS schematic. This same schematic applies to both pre- and post - project conditions and
both the 10% (10 year) and 1% (100 year) storm events.
klotz451associates
Re- analysis of Drainage Impacts to B106 -02 -00 and B106 -00 -00
August 30, 2010
Page 2 of 2
Stream B106-02-00, which is unstudied, was divided into an upstream reach and a downstream
reach for flood routing. The dividing point between the reaches is Old Hickory Drive. In order
to define storage - discharge relationships for these reaches, an HEC -RAS model was developed
using geometry from LiDAR data. As -built drawings dated February 2, 1982, entitled "Fairmont
Park East — Section One," prepared by Gulf Coast Engineering & Surveying were used to define
bridge geometry at Old Hickory Drive (and adjacent Humble Pipeline) and the channel geometry
upstream from that point. The resulting storage - discharge relationships were used for Modified
Pul's routing in HEC -HMS.
Results and Conclusion
Table 1 shows a comparison of computed flows between pre- and post - project conditions for the
1% storm event. This table shows for 13106 -00 -00 there is no impact on flows between the
confluence with B106-02-00 at Junction 2 and the confluence with Armand Bayou (B100- 00 -00)
at Node b100 #7d. However, for B106-02 -00 there is an increase in computed flows at Old
Hickory Drive. The 1% -event hydrographs for pre - and post - project conditions are shown for
these locations on Exhibits 3a thru 3f.
Table 2 shows the same comparison for the 10% storm event. This table shows for B106 -00 -00
there is no impact on flows between the confluence with B106 -02 -00 at Junction 2 and the
confluence with B 100 -00 -00 at Node b 100 #7d.
In conclusion, our re- analysis of impacts for the proposed drainage improvements shows no
impacts on flows for the 10% and 1% storm events within B 106- 00 -00. Therefore, for B106-00-
00 the proposed project will cause no impact for events up to and including the 100 -year (1 %)
event.
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