Appendix B: Bioengineering for Streambank Erosion Control -- Guidelines
Hydroseeding and hydromulching can be a useful and effective means of direct seeding
in the terrace zone, particularly on slopes greater than 3H:1V and places where it is difficult
to get equipment. Sometimes, it is possible to work from a small barge and use hydroseeding
and hydromulching equipment on the barge (Figure 42) and blow them onto the bank. If
seeds are blown on in a water slurry, a generic type mix is suggested by Leiser (1994):
Grass seed
50 pounds/acre
Woodfiber mulch
500 pounds/acre
Water
As needed
Fertilizer (if not broadcast)
250 pounds/acre
According to Leiser (1994), the slurry should be continuously mixed as ingredients are
Figure 42. Hydroseeding and mulching operation from a barge.
added and mixed at least five minutes following the addition of the last ingredients before
application begins. The slurry should be continuously mixed until used and application must
be completed within two hours of the last addition. Water should be potable or at least
filtered so as not to clog spraying equipment. The slurry should be applied at a rate that is
non-erosive and minimizes runoff.
On level areas and slopes of less than 3H:1V, seed should be broadcast by mechanical
hand or power-operated spreaders or drilled on contour with a Brillion or range drill as site
conditions permit. Broadcasted seed should be covered by raking or dragging with a chain,
chainlink fence, or other approved means unless previously planted with cuttings or
transplants (Leiser, 1994).
B-67
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