[https://sustainabletechnologies.ca/home/urban-runoff-green-infrastructure/low-impact-development/perforated-pipe-systems/ STEP and partners research and reports on exfiltration systems] | [https://sustainabletechnologies.ca/home/urban-runoff-green-infrastructure/low-impact-development/perforated-pipe-systems/ STEP and partners research and reports on exfiltration systems] |