How it Works
PaveDrain Design Assistance
PaveDrain Design Objective
The stone reservoir immediately beneath the PaveDrain System is ¾" clean angular stone (#57 Stone) with no fines. The depth of this first stone reservoir beneath the PaveDrain System ranges from 6"-10" based on the soil conditions, anticipated loading and storm water volumes. Additional stormwater storage can be achieved by adding an additional layer of larger diameter (2"-3") stone to the required depth.
A geogrid or woven monofilament geotextile layer is STRONGLY recommended below the bottom layer of stone to maintain a clean stone reservoir and enhance structural stability. Please contact PaveDrain, LLC for geosynthetic recommendations.
Void space for stone varies from 30% on ¾" clean stone and up to 40% for 2-3" clean stone.
PaveDrain, LLC will provide a mat layout of the project and recommended mat sizes to optimize job efficiency and improve cost. A standard mat size measures 8' x 18.0' long.
PaveDrain® permeable paving supported by HydroCAD
HydroCAD-10 provides direct support for the PaveDrain system of permeable articulating concrete block mats. This allows the storage and infiltration capabilities of PaveDrain installations to be easily modeled with HydroCAD.
The PaveDrain can be modeled with HydroCAD-10, which provides an interactive chamber wizard for easy layout, pricing, and modeling of modular storage systems.
Testing and Analysis
PaveDrain System Passes ASTM C1781/C1781M-13
PaveDrain System Passes ASTM C1701/C1701M-09
Based on the test results, it is our opinion that the infiltration rate of the PaveDrain System is a minimum of 4,000 inches per hour.
|Inside Diameter of Infiltration Ring (in)||12.5||12.5|
|Elapsed Time of Test (sec)||7.3||7.8|
|Infiltration Rate (in/hr) (l=KM/(D2*t))||4449.1||4163.9|
|Average Infiltration Rate (in/hr)||4306.5|
American Excelsior Company's ErosionLab® was contracted by ECS Solutions, LLC to help better understand the infiltration capabilities of the PaveDrain® porous paver technology.
The outdoor testing for the study was conducted during August 2010 at ErosionLab. The PaveDrain blocks were installed over two plots that contained different underlying materials. The plots were exposed to increasing simulated rainfall events with one hour durations until runoff was measured from the plot.
Porous Pavement BMP's score at or NEAR the top in virtually every major category.
Infiltration systems can be considered 100 percent effective at removing pollutants in the fraction of water that is infiltrated, since the pollutants found in this volume are not discharged directly to surface waters. Quantifying the removal efficiency of infiltration systems, therefore can best be determined by calculating the percent of the average annual runoff volume that is infiltrated, and assuming 100 percent removal of pollutants found in that runoff volume.
INTERNAL STORAGE CHAMBER CALCULATIONS
|CREDIT 6.1 - Stormwater Design, Rate & Quality Control||1 Point|
|Limit distribution of natural water flows by managing stormwater runoff|
|CREDIT 6.2 - Stormwater Treatment||1 Point|
|Implement a stormwater management plan that reduces impervious cover, promotes on-site filtration and eliminates contaminants.|
|CREDIT 5.1 - Site Development||1 Point|
|Protect or restore habitat|
|CREDIT 7.1 - Heat Island Effect, Non Roof||1 Point|
|Reduce heat islands|
MATERIALS & RESOURCES
|CREDIT 5.2 - Regional Materials||1 Point|
|20% Extracted, processed, and Manufactured Regionally within 500-mile radius of source. (If applicable)|
Prices for the PaveDrain System will vary per region across the United States. A conservative cost for a standard gray PaveDrain block is around $6.00-$7.00 per square foot. This price may or may NOT include delivery depending on the plant location and the cost of fuel.
Installation is typically around $2.00-$3.00/square foot. The aggregate bedding layers typically costs around $2-3/square foot. Overall costs have been around $9.50-$11/square foot depending on the size of the project. If developers do NOT have to purchase additional land and or incur massive excavation costs in order to meet stormwater regulations, they are more inclined to lean in the direction of PaveDrain System as their stormwater management system of choice.