Stormwater, Infiltration | Parjana Engineering

Parjana

℠

System

Parjana^℠ Engineering has ongoing research collaborations with academics, government agencies, and corporations worldwide, and manage projects in diverse applications and settings: city streets and sidewalks, agricultural land, large commercial developments, groundwater recharge facilities, and beyond.

Learn more about Parjana^℠'s projects and applications in our Knowledge Center

Belle Isle, Detroit, MI Before

The primary goals of this investigation were to determine if the Parjana^℠ system could eliminate standing water on an approximately 24 acre parcel and decrease the volume of stormwater delivered to Detroit Water and Sewerage Department (DWSD) through the municipal combined sewer drain system thereby alleviating the cost associated with treatment. A secondary goal was to explore the effect the Parjana^℠ system has on groundwater.

Prior to installation, the amount of runoff volume was nearly double the amount of rainfall volume due to the pipe network capturing water from a larger area of the island and possibly influenced by the Detroit River.

Belle Isle, Detroit, MI After

After installation, the runoff volume is much less than rainfall volume.

The rain fall has less direct impact on the amount of runoff from the site when comparing control site versus test site.

There was an 80% reduction in the total amount of runoff volume from the test site.

Lawrence Technological University, Southfield, Michigan

Lawrence Technological University (LTU) is leading a collaboration of industry partners in a multi-state demonstration project featuring the implementation of an innovative and scalable integrated drainage design that significantly mitigates polluted parking lot stormwater runoff. The integrated drainage system includes three separate patented technologies combined in a novel approach including a porous pavement surface (parking performance maintained), an underground engineered soil storage reservoir (for stormwater storage and water quality filtration) and the Parjana^℠ system (to improve infiltration and reduce runoff). A preliminary, 3rd party evaluation of the impact of the Parjana^℠ system on groundwater elevation and recovery time at the Lawrence Technological University site was conducted and found:

Magnitude of change in groundwater elevation was greater during storm events in 2017 vs. 2016
Groundwater elevations increased more rapidly during storm events in 2017 vs. 2016
Groundwater levels recover to baseline elevations faster in 2017 vs. 2016
Horizontal hydraulic gradients measured in the wells increased more rapidly during rain events in 2017 vs. 2016

The conclusion drawn from these initial results were that Parjana℠ system acclimation has an apparent effect on groundwater elevations and groundwater recovery times.

Geneva International Airport, Switzerland

Parjana^℠ system was installed at Geneva International Airport (GIA) in late 2012 and was constantly monitored through piezometric testing for nearly two years (GADZ 2014). The goal for GIA was to reduce or eliminate water seepage into underground concrete chambers that are common at the airport; especially chambers that are remote from existing storm water sewer systems. The research goal was to compare the effects of Parjana^℠ system device on shallow water tables and soil moisture distribution. Unlike other typical Parjana^℠ sytem installations, this location had no issues with standing surface water. The report indicated the water table was higher in the area of the Parjana^℠ system during dry periods. GADZ attributed this to the fact the Parjana^℠ system “worked to maintain a degree of saturation as constant as possible in the soil” and the Parjana^℠ system is moving water vertically in both directions thereby creating communication between the surficial layers of topsoil and the permeable to semi-permeable soils beneath (PCS2014).

Coleman A. Young International Airport, Detroit, Michigan

This project was developed to address to the concerns of the Michigan Department of Environmental Quality (MDEQ) in regards to the Parjana^℠ system influence on the infiltration of surface water and its potential to accelerate surface water contaminates into the groundwater supply. Data showed that the Parjana^℠ system increased the infiltration rate of surface water 7 to 10 times the rate of native soil conditions. The study also concluded that Parjana^℠ system do not act as vertical drains or injection wells that allow water, along with its’ constituents, to flow straight down to the bottom of the Parjana℠ system (Lusch 2015).