Before revision: Regulations and approvals for hydrodynamic separators As stormwater regulations become increasingly stringent, many states and municipalities have developed criteria to govern the use and sizing of HDS systems, and publish lists that identify acceptable HDS systems.For example, see NJDEP list of approved "Stormwater Manufactured Treatment Devices."
After revision: Regulations As stormwater regulations become increasingly stringent, many states and municipalities have developed criteria to govern the use and sizing of HDS systems, and publish lists that identify acceptable HDS systems.For example, see NJDEP list of approved "Stormwater Manufactured Treatment Devices."