Some municipalities require these reports and designs to accompany land use proposals such as proposed conditional uses, and zoning change applications. These both need a concept site plan and an H&H Study to determine the approximate storm basin sizing.
Otherwise these reports are included in our proposals for most land development applications (site plans and plats).
We also perform these services for as-built’s (post construction) and community or private stormwater facilities that need maintenance; or have been shown to be problematic for various technical reasons. We have been performing stormwater studies (H&H Studies), typically using NRCS TR55/TR20 based programs since 1996.