[[File:Two prong method catchbasin sediment acc..PNG|thumb|320px|Measuring sediment depth in a catchbasin utilizing the "two prong method" (Photo Source: King
County, 2010)<ref>King County. 2010. Tips for Successful Drainage Facility Self-Inspection. Department of Natural Resources and Parks. File Name: 0906_DrainTIPS.indd lpre. Developed: June, 2010. https://www.seatacwa.gov/home/showpublisheddocument/31441/637662770980630000</ref>]]