WHY DID SAN JOAQUIN COUNTY GET NEW FLOOD INSURANCE RATE MAPS?
San Joaquin County’s FIRMs were out of date. Some formerly rural areas were never mapped in detail, and other areas had not been re-mapped in more than 29 years. Over time, water flow, levee conditions, and drainage patterns change due to erosion, land use, and natural forces. The likelihood of flooding in certain areas changes along with these factors.