X= f(F, G, R,W, V)
X= potential average annual erosion
F= soil erodibility
G= local wind erosion climatic factor
R= soil surface roughness
W= equivalent width of field
V= equivalent quantity of vegetative cover.
Wind erosion conservation
1.windbreaks description, example, Drip design for windbreaks
4. snow deposition
5. sunflower barriers
6. emergency tillage
7. grass barriers .
d= 17h (vm/v)cos (theta)_
where d= distance of full protection
h= height of barrier in any units
vm= minimum wind velocity at 50 ft height required to move the most erodible soil fraction
v= actual wind velocity at 50 ft height
theta= angel of deviation of prevailing wind direction from the perpendicular to the wind break.
vm can be estimated at 21.5 mph
correction for wind height
d= 17 *h*1 if wind speed is 21.5 and theta is 0 cos 0 is 1
height of trees 30 ft then protection is 510 ft.
if wind is 40 then d= 17*30*21.4/40 = 272
example wind speed for Campbell network is at 12 ft
u2=u1*(z2/z1)^.2= 15mph * (50/12)^.2 = 15*1.33= 20 mph
application of irrigation of .39 to 59 inches per day to keep soil from blowing.
Type of plant suited for New Mexico for wind and water conservation