Grading and drainage in Rocklin are controlled by Municipal Code Ch. 15.28 (Grading) together with the City's Improvement Standards and January 2019 Post-Construction Manual, which implement Low Impact Development (LID) requirements from the State Phase II MS4 Permit (WQO 2013-0001-DWQ).
Rocklin MC Ch. 15.28 governs cut, fill, embankments, and drainage on all private property and requires plans, permits, and inspections for regulated grading work. The City's Improvement Standards (November 2016) and Post-Construction Manual (January 2019) set engineering standards for storm drainage and post-construction stormwater control measures (LID/source control/treatment) on new development and significant redevelopment, as required by the State Phase II Small MS4 General Permit (Order WQO 2013-0001-DWQ, NPDES CAS000004). Required measures typically include site-design source controls, runoff-reduction LID features (bioretention, vegetated swales, pervious pavement), and hydromodification management where applicable. Drainage that materially alters runoff onto adjacent parcels can also expose owners to common-law nuisance and California Civil Code §3479 et seq. (nuisance) claims.
Performing regulated grading or drainage work without a permit, or failing to install approved post-construction stormwater BMPs, violates Ch. 15.28. The City may stop work, withhold occupancy, and require corrective drainage or BMP installation; State Water Board may assess civil liability under Water Code §13385.
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