A Citizen’s Guide to Private Stormwater Ponds

Sean VanDerGracht, CFM Engineering Specialist II

Dept. of Natural Resources

What is a stormwater management system?

Simply put, a

stormwater

management system is

a tool for managing

runoff from rainfall.

What is the function of a stormwater pond?

Prevent urban flooding

Slow runoff velocity

Remove pollutants

Types of Stormwater Systems

Retention System: Allows water to percolate through the soil into the groundwater.

Types of Stormwater Systems

Detention System: Discharges runoff through a control structure to surface waters.

Types of Stormwater Systems

Swale: A linear retention system that conveys water during and immediately after a storm.

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.

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.

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.

Enforcement Tools

• Notice of Violation

• Consent Order

• Code Enforcement Magistrate

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

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.

Outfall Structure with Bleed-Down Orifice

Outfall Structure with V-Notch Weir SHWT – Seasonal High Water Table

SHWT – Seasonal High Water Table

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.

Inspections

Ponds should be inspected at least semi-

annually if not quarterly.

Common Pond Issues: Erosion and Sedimentation

Common Pond Issues: Slope Destabilization

Common Pond Issues: Failing Infrastructure

Common Pond Issues: Trash and Debris

Common Pond Issues: Vegetation Overgrowth

Common Pond Issues: Vegetation Overgrowth

Resources/Publications

Southwest Florida Water Management District

(SWFWMD).

How to Operate & Maintain Your Stormwater

Management System