The H Series of flumes developed in the 1930's, were broken up into three distinct classes:
- HS - low flows - "S" equaling small
- H - medium flows
- HL - high flows - "L" equaling large
WITHIN each class of flume, the flumes are scale models of each other. They are not, however, scale models of each other when comparing BETWEEN classes - the general layouts are similar, but they are not identical.
For a given height (D = flume depth):
- HS flumes are the narrowest (1.05D) and have an average length (1.5 D)
- H flumes average in width (1.90 D) and are the shortest in length (1.35 D)
- HL flumes the widest (3.20 D) and have an average length (1.5 D)
HS Flume Dimensions
H Flume Dimensions
HL Flume Dimensions
Source: Field Manual for Research in Agricultural Hydrology