A Citizen’s Guide to Private Stormwater Ponds...System Compliance & Enforcement of Codes Sec....
Transcript of A Citizen’s Guide to Private Stormwater Ponds...System Compliance & Enforcement of Codes Sec....
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A Citizen’s Guide to Private Stormwater Ponds
Sean VanDerGracht, CFM Engineering Specialist II
Dept. of Natural Resources
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What is a stormwater management system?
Simply put, a
stormwater
management system is
a tool for managing
runoff from rainfall.
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What is the function of a stormwater pond?
Prevent urban flooding
Slow runoff velocity
Remove pollutants
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Types of Stormwater Systems
Retention System: Allows water to percolate through the soil into the groundwater.
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Types of Stormwater Systems
Detention System: Discharges runoff through a control structure to surface waters.
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Types of Stormwater Systems
Swale: A linear retention system that conveys water during and immediately after a storm.
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Who takes care of our pond?
The operational and day-to-day maintenance of the stormwater management system (SWMS) becomes the responsibility of the HOA or the impacted property owner.
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System Compliance & Enforcement of Codes
Sec. 138-179 – Adherence to Approved Site Plans All development shall be constructed in strict compliance with the
approved final site plan.
Any additional site alteration shall require further site plan review.
All land or water areas required to remain in a natural condition shall not
be altered in any way from such natural condition, except by further site
plan review and approval.
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System Compliance & Enforcement of Codes
Sec. 154-57 – Drainage Plan Every application for new construction or substantial improvement of
existing construction, including single-family homes, subdivided lands and
unplatted lands, must include a drainage plan demonstrating that;
All runoff entering the site from adjacent lands is carried through the site and discharged to a positive outfall.
On-site detention and/or retention is provided as required, Existing surface water drainage systems are not blocked or diverted
onto adjacent property. The drainage system can be maintained; plantings will be limited to
sodding; drainage easement areas will not be built upon and the system will continue to function.
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Enforcement Tools
• Notice of Violation
• Consent Order
• Code Enforcement Magistrate
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Stormwater System Compliance
Approved Site Plan Paving, Grading and Drainage Plan
Cross-Sections
Structure Details
General and Special Notes
Drainage Plan
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Outfall Structure with Bleed-Down Orifice
Outfall Structure with V-Notch Weir SHWT – Seasonal High Water Table
SHWT – Seasonal High Water Table
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Operational Maintenance
Restoration back to its original condition
Every 15 - 25 years Removing detritus from the sump.
Re-establishing bank slopes and elevations.
Replacement of under-drains or subsurface filtration
systems.
Ensure inlet and outlet structures operate as designed.
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Outfall Structure with Bleed-Down Orifice
Outfall Structure with V-Notch Weir SHWT – Seasonal High Water Table
SHWT – Seasonal High Water Table
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Day-to-day Maintenance
Ensuring SWMS functions as designed Maintaining adequate littoral zone coverage.
Routine mowing and edging.
Mechanically harvesting invasives.
Removal of floating debris.
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Inspections
Ponds should be inspected at least semi-
annually if not quarterly.
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Common Pond Issues: Erosion and Sedimentation
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Common Pond Issues: Slope Destabilization
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Common Pond Issues: Failing Infrastructure
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Common Pond Issues: Trash and Debris
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Common Pond Issues: Vegetation Overgrowth
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Common Pond Issues: Vegetation Overgrowth
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Resources/Publications
Southwest Florida Water Management District
(SWFWMD).
How to Operate & Maintain Your Stormwater
Management System