The Low Impact Hydropower Certification Handbook is reviewed at least annually. The Handbook is in its Second Edition, Revision 2.04 – April 1, 2020 (a redline version showing recent changes is here).  The Handbook is edited and updated as needed with input from staff, governance, and with public comment in the case of proposed programmatic changes.

See https://lowimpacthydro.org/eligibility/ for the current proposal to expand eligibility for newer construction.