Because Champaign County is situated on a large and very flat plateau, it had virtually no natural drainage, so that much of the County consisted of wetlands until drainage ditches were built, beginning in the 1870s. This was an example of an upland marsh, which resulted in a high incidence of malaria before the late nineteenth century.
because champaign county is situated on a large and very flat plateau it had virtually no natural drainage so that much of the county consisted of wetlands until drainage ditches were built beginning in the 1870s this was an example of an upland marsh which resulted in a high incidence of malaria before the late nineteenth century