Table 4. Characteristics of Grass Cover

Figure 2.5. n-value relationships for grass cover

Composite Hydraulic Properties

Cvr-Chpt8
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Table 4. Characteristics of Grass Cover.

Weeping lovegrass................

Excellent stand, tall (average 30 in.)

Yellow bluestem Ischaemum....

Excellent stand, tall (average 36 in.)

Very dense growth, uncut

Bermudagrass......................

Good stand, tall (average 12 in.)

Native grass mixture (little

Good stand, unmowed

bluestem, blue grama, other long

and short midwest grasses)

Weeping lovegrass................

Good stand, tall (average 24 in.)

Lespedeza serices.................

Good stand, not woody, tall (average 19 in.)

Alfalfa..............................

Good stand uncut (average 11 in.)

Weeping lovegrass...............

Good stand, mowed (average 13 in.)

Kudzu..............................

Dense growth, uncut

Blue grama........................

Good stand, uncut (average 13 in.)

Crabgrass..........................

Fair stand, uncut (10 to 48 in.)

Bermudagrass.....................

Good stand, mowed

Common lespedeza..............

Good stand, uncut (average 11 in.)

Grass-legume mixture--summer

Good stand, uncut (6 to 8 in.)

(orchard grass, redtop, Italian

ryegrass and common lespedeza)

Centipedegrass....................

Very dense cover (average 6 in.)

Kentucky bluegrass...............

Good stand headed (6 to 12 in.)

Bermudagrass......................

Good stand, cut to 2.5-inch height

Common lespedeza...............

Excellent stand, uncut (average 4.5 in.)

Buffalograss.......................

Good stand, uncut (3 to 6 in.)

Grass-legume mixture--fall,

Good stand, uncut (4 to 5 in.)

spring (Orchardgrass, redtop,

Italian ryegrass, and common

Lespedeza sericea.................

After cutting to 2-inch height; very

good stand before cutting

Bermudagrass......................

Good stand, cut to 1.5-inch height

Bermudagrass......................

None of the n-value equations account for momentum or bend losses.

Presently, the only technique to account for bend losses is to increase the n-

values by some factor. Chow (1959) presents the Cowan method for including

bend losses. This method requires the user to input the n-values directly, thus

this method could be applied by the user to the SAM input.

Figure 2.6. Prescribing hydraulic roughness.

Theoretical Basis for SAM.hyd Calculations

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