TM 5-820-3/AFM 88-5, Chap. 3
b. The selection of the channel cross section is
required on steeper slopes. In addition, a study will
predicted on several factors other than hydraulic
be made of other factors that might affect the
elements. Within operational areas the adopted
stability of the side slopes, such as soil
section will conform with the grading criteria con-
characteristics, excessive ground-water inflow, and
tained in AFR 86-8 or TM 5-803-4. Proposed
bank erosion from local surface-water inflow.
c. Earth channels normally require some type of
maintenance methods affect the selection of side
slopes for turfed channels since gang mowers
lining such as that obtained by developing a strong
cannot be used on slopes steeper than 1 vertical (V)
turf of a species not susceptible to rank growth. In
to 3 horizontal (H), and hand cutting is normally
particularly erosive soils, special methods will be
6-3
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