EXAMPLE PROBLEM 1. Given: R1 = 140 cGyph
Te = H + 6 hours
Ts = 1 hour
Find: D
Answer: 72 cGy
Solution: Since no soil type is indicated, use the scale for Soil Types II and IV under stay time. On
Figure 6-16, connect H +6 hours on the Te scale and 1 hour on the Ts scale (Soil Types II and IV) with
the hairline. Pivot the hairline at its point of intersection with the index scale to 140 cGyph on the R1
scale. Read 72 cGy on the D scale at the point of intersection with the hairline.
EXAMPLE PROBLEM 2. Given: D = 25 cGy
R1 = 100 cGyph
Ts = 0.4 hour
Soil Type III
Find:
Te
Answer: H + 3 hours
CM2308
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