New York Codes, Rules and Regulations
Title 1 - DEPARTMENT OF AGRICULTURE AND MARKETS
Chapter IX - Agricultural Districts
Part 370 - Land Classification System
Section 370.7 - Criteria for ranking organic soils

Organic soils shall be grouped according to the following criteria:

Group A- Soils that have muck 51 inches deep or deeper, have adequate drainage and 10-year or better flood protection.

Group B- Soils that have muck 16 inches to 51 inches deep, at least 10 year flood protection and adequate drainage.

Group C- Soils that have muck 51 inches deep or deeper, are either subject to flooding one year out of five years or are inadequately drained, but not both.

Group D- Soils that have muck 16 inches to 51 inches deep, are subject to flooding once in five years and/or are inadequately drained, or are 51 inches deep or deeper and are both inadequately drained and floods once in five years.