Measured Stormwater and Infiltration Performance
Parjana’s results are documented at real sites, not modeled in a brochure. This page brings the strongest measured outcomes into one place, from municipal parks to an international airport to a university evaluation.
Belle Isle in Detroit is one of the documented sites below: after installation, runoff volume was much less than rainfall volume, an 80% reduction in total runoff from the test area.
runoff reduction at Belle Isle
native-soil infiltration, Coleman A. Young Airport
infiltration increase in existing basins
evaporation loss reduced in basins
Results at a glance
Every number below traces to a documented Parjana site.
| Site | Result | Why it matters |
|---|---|---|
| Belle Isle | 80% runoff reduction | Reduced water needing treatment by the Detroit Water and Sewerage Department and reopened the site for park visitors |
| Coleman A. Young International Airport | 7 to 10x infiltration | The study concluded the system does not act as a vertical drain or injection well |
| Lawrence Technological University | Faster response & recovery | Documented in a preliminary third-party evaluation |
| Existing basin applications | 9x infiltration, evap −50%+ | Restores usable capacity in infrastructure already in service |
| St. Hugo baseball field | Dry within 12 hours | Chronic flooding before installation, no accumulation after a two-inch storm |
More documented sites
Plum Brook Golf Course, Fresno Leaky Acres, Geneva International Airport, and agricultural soil-moisture studies round out the record.
Each one shows the same pattern: measured increases in infiltration and measured reductions in standing water and runoff.
Bring your site into the record
Every Parjana installation is a candidate for monitoring and verification, which means your project can become the next documented result.
Request a site assessment
Tell us where your site is and what it needs to prove. We will scope how to measure and verify its performance.
Performance results: common questions
Are these results modeled or measured?
Measured. Each figure comes from a monitored installation at a real site, not from a model or a brochure estimate.
What was measured at Belle Isle?
An 80% reduction in total runoff from the test area.
What was measured at Coleman A. Young International Airport?
A 7 to 10 times increase in infiltration relative to native soil.
What happens in existing detention and recharge basins?
Existing basin applications have shown a 9 times infiltration increase and more than a 50% reduction in evaporation loss, with faster drawdown restoring storage capacity between storms.
How quickly can a field drain after a storm?
At the St. Hugo baseball field, the field was dry within 12 hours after a 2-inch storm.