CPWG Stormwater Management team provides NPDES services to Madeira Beach
CPWG Performed Field Reconnaissance to Identify:
- Detention Ponds
- Control Weirs
- Outfall Pipes
CPWG Created a Stormwater Computer Model to
- Track the Quantity of Runoff
- Track the Amount of Runoff
- Assess Effects of Stormwater, Tidewater, and Sewer Overflows
- Test Potential of Stormwater Controls
CPWG Recommended Improvements Included:
- Public Information Program
- Removal of Marine Growth in the Outfall Pipes
- Backflow Prevention Devices a the Outfalls
- Stormwater Pump Station
NPDES Consulting Services
Madeira Beach, FL
The CPWG Stormwater Management team was engaged by the City of Madeira Beach to provide the National Pollutant Discharge Elimination System (NPDES) services. The goal of our service was to ensure the city maintained compliance as a co-permittee of the Pinellas County Cycle 3 NPDES permit.
CPWG began the process of NPDES consulting by collecting and reviewing data from a number of sources to develop a comprehensive Stormwater Master Plan for the City. Data collection was focused on identifying and quantifying hydraulic elements within 106 primary drainage basins. Existing reports and plans were obtained, reviewed, and categorized.
The CPWG Stormwater Management team performed field reconnaissance for each drainage basin to verify existing conditions. Field notes were taken to document the location, type, size, length and, the number of structures (culverts, detention ponds, control weirs, inlets, manholes, and ditches, etc.). Photographs were taken of each drainage structure to document the condition of the structure at the time of the field investigation.
CPWG Stormwater experts used the data the collected to create a computer model to simulate flooding events for certain storm events. The 25-year, 24-hour storm event (9-inches of rain within 24-hours) was chosen to identify the flooding risk within the drainage basins. The model allowed our team to track the quantity and quality of runoff created within each sub-basin. The resulting model allowed our Engineers and Planners to accurately represent any combination of stormwater controls within the study area to determine their effectiveness in managing stormwater, tide water, and sewer overflows.
Stormwater improvements were identified within each of the priority drainage basins to reduce flooding and provide some measure of water quality improvement when possible. The improvements focused on the following areas:
The CPWG Stormwater Management team developed public education and outreach program plans to
1. Encourage citizens to reduce their use of pesticides, herbicides, and fertilizers.
2. Promote, publicize, and facilitate public reporting of the presence of illicit discharges and improper disposal of materials into the Municipal Separate Storm Sewer System (MS4).
3. Encourage the proper use and disposal of used motor vehicle fluids, leftover hazardous household products and lead acid batteries.
4. Encourage citizens to identify and eliminate sources of illicit discharges, illicit connections or dumping into the MS4.
Our team also provided the city with detailed material measures they could take to improve their systems and limit the damage from flooding. A few examples of these are:
1. Removal of marine growth that occurs in each of the City’s outfall points into the bay. Remove oysters growing in the open outfall pipes to the point where sunlight is not able to penetrate into the pipe,
2. Backflow prevention devices at the outfalls to reduce inundation from the bay during high tides and storm surge events. These devices function as a check valve to allow flow in only one direction and prevent backflow during high tides or storm surge events.
3. To complete the plan CPWG recommended Stormwater Pump Stations with back-up generator at the outfall pipes for flooding reduction during major storm events, especially during high tides. A pump station would be required to reduce flooding when the tide water is higher than the roadway inlet rims.