Soils 456 Irrigation and Drainage Answers to chapter 6 questions

6.1
Intake rat of silt loam (table 6.2)0 .25-0.4 inches /hr

Depth of water applied intake rate * time
0.25*2= 0.5 inches
0.40 * 2= 0.8 inches

6.2
Ground cover is in a hot climate. Soil silt loam Allow 60% of the water to be depleted (MAD=.6)

Water holding capacity 2 inches/ft for silt loam
Available water= water holding capacity * root depth= 2 inches/ft * 1 ft = 2 inches
RAW= AW*MAD= 2*0.6= 1.2 inches

6.3

High PET period= 0.45 inches/day
Plant factor for tree 0.8
plant water use= PET*k= 0.45*0.*= 0.36 inches/day
AW=3 inches available

Irrigation interval= AW*MAD/ usage/day
Irr.int= 3inches *0.5/0.36 inches/day =4.1 days

6.4

Depth of water is 1 inch/ft from course sand =1 inch/ft*2.54 cm/inch*1ft/.3048m= 8.33 cm/m