The Energy-Passive Groundwater Recharge Product® is a new technology that can improve strormwater infiltration. Originally designated to promote drainage on sports fields and at private residences, it also can enhance the performance of green infrastructure and help reduce combined sewer overflow. Donald Carpenter of Lawrence Technological University and Todd Houser of DiGeronimo Aggregates, LLC report on the technology’s applications and how it works. Read more
Explore our curated collection of data, scientific reports, and headlines featuring the EGRP®
This report represents a brief discussion on several research projects conducted by or with Parjana® Distribution in collaboration with various government, private, and educational entities to validate the efficacy of the Parjana® Distribution Energy-passive Groundwater Recharge Product (EGRP®) system. Read more
Frequently Asked Questions
The passive design of the EGRP® is unique and much different than traditional drainage systems. It is difficult to compare the EGRP® with existing drainage systems that depend on pipes or channels to deliver water to holding basins because the purpose of the EGRP® system is not to channel water.
However, the following can be said about the EGRP®. It is the only patent pending technology of its kind to date. It requires zero maintenance, unlike traditional systems that accumulate maintenance fees over time, and it is a long-term solution. The EGRP® is a low impact, eco-friendly technology with no comparable competition. There is no other economical way to manage standing water in the same simplistic way that the EGRP® does.
The EGRP® system functions the same way in all soil types but performance varies. Soil is classified based on particle size and texture. The most common soil types are: clay, silt and sand. Clay has very small and compact particles, causing water to stay within this soil for long periods of time. Silt has fine particles and as a result holds water similar to clay. Sand has large particles, allowing water and nutrients to travel quickly and drain away. Because the EGRP® uses the natural forces of the soil, it is able to function the same in all soil types although the soil types vary in properties.
A hole,slightly larger in diameter than the EGRP® and at least 12” longer than the length of the EGRP®, is bore with a drilling machine to the appropriate depth in the vadose zone. Each EGRP® is driven vertically into the pilot hole with a cap at least 2 feet below the surface. The hole is then closed with the excavated soil. After a period of at least 12 weeks, the EGRP® acclimates and then becomes fully activated.
There are two financial options for Certified Parjana® Installers (CPIs) purchasing or leasing.
The price of the EGRP® system is determined by a custom designed layout. Variable will be the direction of water movement, the severity of the issue, soil conditions, accessibility and pre-existing drainage and underground obstacles.
The EGRP® becomes a part of the soil matrix. Over time, the soil boring collapses around the EGRP® from the pressure exerted by the ground. As the soil boring decreases in size, the EGRP®’s connection with the vadose zone increases. The EGRP® system works from the bottom-up. Forces underground increase with depth causing the soil boring to collapse around the EGRP® at its lowest point. It begins opening the soil pores in the lowest, compacted areas and gradually continues the process towards the surface. This gradual connection enables the EGRP® to expand and contract, disturbing water molecules more evenly through the soil matrix.
This will depend on your specific goals, application, soil type, size of installation, and the climate at your installation site. The EGRP system improves over time so while you will notice a difference initially your final design goal may not be met until months later.
Fill out the CPI application or contact Roy Cole at firstname.lastname@example.org for further questions.
The EGRP® effects and results can be measured. Many tests and case studies have been conducted to measure the EGRP®’s performance, with the results showing positive effects. However, because the EGRP® works with its surrounding environment, each EGRP® performance will be unique to the site.
The EGRP® can be used in conjunction with other stormwater management solutions. It can enhance performance and reduce maintenance. The performance is unique to each site and to each stormwater management solution. Parjana currently plans to conduct research in order to measure the EGRP®s performance with other BMPs.
The EGRP® is a 1¼” ( 31.75mm) diameter hydrophobic polyethylene tube made of five chambers with open channels along the edges and capped at the top. The five chambers are crescent-shaped plastic extrusions joined together that work with the pressure and gravity of the earth. It can vary in lengths of 5′ (1.524m), 10′ (3.058m), 20′ (6.096 m) and 40′ (12.192 m), depending on the site.
The design is created to develop a perfect balance between nature and the EGRP®. Dimension, size, length and distance are vital in the design process. These elements are proprietary elements of the EGRP® technology.
Layouts are custom designed solutions that address the customer’s water problems. Each layout shows the entire area with the precise location(s) for the EGRP®(s) and indicates the amount, location and depth of each EGRP®. All layouts are designed and approved by Parjana® for each specific location.