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Step l <br /> • Determine the ratio between the critical height ( Hcl of the soil arch and the <br /> ) <br /> diameter(B' y,of the depression for the soil layer. <br /> B, =2rt <br /> H CI (from Figure 2) <br /> BI <br /> Step 2 <br /> • Determine the half apex angle ®I of the cone of soil within the soil layer. <br /> HCI _Bl(HCI /BI) <br /> 41 =Tan—,(rl /HCl) <br /> Step 3 <br /> • Determine the radius (r2) at the base of the waste layer that remains,unsupported <br /> by the arch within the soil layer. <br /> I _ r2 <br /> Hc! Bcl �H! <br /> rl(H —Hj) <br /> r2 — H <br /> C, <br /> (G) <br />