Presentation outline 2009-1-2 DraftStormwater Work Session
KB Comments --Draft Presentation Outline
1.Introduction to Stormwater Management
A.What is Stormwater runoff (Definition)?
i.run off vs. seeping into the ground
ii.not treated
iii.Where does it end up? Lake Grapevine, Big Bear Creek
B.Vital Statistics
i.city square miles
ii.# of residents
iii.% impervious coverage
iv.x miles of streams
v.x miles of storm sewers
vi.existing storm system designed for a 10 year storm event???
vii.Who manages stormwater issues in the city (planning design construction,
maintenance –discussed further in Section 3 – Stormwater Program)
C.Issues with Stormwater runoff ?
i.Public Safety
ii.Flooding
iii.Environmental Protection -Pollution of creeks, rivers and lakes, erosion of
banks
iv.Compliance with regulatory requirements
D.Why do we need to manage Stormwater runoff?
i.good planning –role of the city
ii.creates liability issues (discussed in further detail in section II)
iii.creates costs to the city and region (repairs, improvements- (i.e. bank erosion),
treatment of polluted water more costly)
iv.pollution hurts wildlife in streams, creeks and lakes
v.Federal and State regulations
E.What regulations are currently in place to manage stormwater and runoff (current
strategies)?
i.Federal Clean Water Act (Southlake a Phase II City)
a.Control construction runoff
b.Outreach and Education
c.Detect Illicit Discharge
d.Control Post Construction Runoff
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e.Municipal housekeeping
ii.Review current city regulations ( drainage ordinance, floodplain ordinance, soil
and control ordinance, etc.)
iii.Stormwater Management Plan
iv.Planning and Permitting
v.Best Management Practices Commonly Used (Education, Stormwater Control
Devices such detention ponds, sediment and erosion fencing and other devices
such as matting, storm drain inlet protection, permeable surface requirements,
etc.).
2.Review of Legal Issues (Allen Taylor)
A.Role of PZ and City Council
B.Legal Liability (executive Session)
3.Stormwater Management Program
A. City Responsibility
i.Planning and Zoning (buffer requirements, impervious surface, lot coverage,
soil permeability, vegetation, lot grading, creating new ordinances) –role of
City Council and the Planning and Zoning Commission in review of zoning
applications and site plans
ii.Design and review of Stormwater Devices (detention/retention ponds, erosion
control measures, etc.-creative designs both functional and aesthetically
pleasing)
iii.Installation, construction and inspection of Stormwater devices
iv.Permitting
v.Maintenance of Stormwater devices (maintain streams, inlets, etc.)
vi.Education – citizens, developers, school kids, etc.
vii.Programs
viii.Stormwater modeling in the City
ix.Update Stormwater Master Plan and Ordinances as needed
B.Costs of a Stormwater Program
(THIS IS AN IMPORTANT SECTION BECAUSE WE HAVE IMPLEMENTED A
MAJOR PROGRAM WITH MINIMAL ADDITIONAL STAFF- CITY COUNCIL
NEEDS TO BE REMINDED OF THIS—ALSO IT IS IMPORTANT THAT CC
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UNDERSTAND THE ENORMOUS COST OF THIS PROGRAM AND ITS
IMPACT ON THE CITY’S BUDGET)
i.Lean Event – Soil & Erosion Control SOP
ii.Ordinance Developments and updates (staff, attorneys)
iii.Staff to implement ordinances (soil and control ordinance, etc.)
iv.Staff to approve permits ( review plans and inspect construction-foundation
grading)
v.Staff to perform maintenance (inlet cleaning, catch basin maintenance,
inspections, equipment, failure of the system)
vi.Modeling of Stormwater (Consultant Costs)
vii.Update Stormwater Master Plan (Consultant Costs)
viii.Develop Cost Estimates for Infrastructure Improvements (Consultants Costs)
C.Funding a Stormwater Management Program (Sharon Jackson?)
i.Permit Fees
ii.Impact Fees
iii.CIP
iv.SW Utility
v.Unfunded needs
D.Challenges
i.Very costly
ii.Federal and State regulatory requirements keep expanding
iii.Environmental – water quality
iv.Can not fund all needed improvements under the current financing structure.
E. Next Steps (To be developed)
4.Questions and Answers
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