[[File:Secch idisk.PNG|thumb|320px|Picture of a typical Secchi disk to help measure sediment depth in underground holding structures. (Photo Source: Wildco, 2018)<ref>Wildco. 2018. Secchi Disk Kit, Fieldmaster®. Accesses May 5 2022: https://shop.sciencefirst.com/wildco/student-water-samplers/5979-fieldmaster-student-secchi-disk-non-calibrated-line-for-student-use-only-200mm.html</ref>]] | [[File:Secch idisk.PNG|thumb|320px|Picture of a typical Secchi disk to help measure sediment depth in underground holding structures. (Photo Source: Wildco, 2018)<ref>Wildco. 2018. Secchi Disk Kit, Fieldmaster®. Accesses May 5 2022: https://shop.sciencefirst.com/wildco/student-water-samplers/5979-fieldmaster-student-secchi-disk-non-calibrated-line-for-student-use-only-200mm.html</ref>]] |