The image above represents soil load on rigid pipe.

To compute for soil load on rigid pipe, three essential parameters are needed and these parameters are **Load Co-efficient for Ditch Conduits (C _{d}), Unit Weight of Fill Material (w) **and

**Width of Ditch at Top of Conduit (B**

_{d}).The formula for calculating Soil Load on Rigid Pipe:

W_{c} = C_{d}wB_{d}²

Where:

W_{c} = Soil Load on Rigid Pipe

C_{d} = Load Co-efficient for Ditch Conduits

w = Unit Weight of Fill Material

B_{d} = Width of Ditch at Top of Conduit

Let’s Solve an example;

Find the soil load on rigid pipe when the load co-efficient for ditch conduits is 16, the unit weight of fill material is 6 and width of ditch at top of conduit is 2.

This implies that;

C_{d} = Load Co-efficient for Ditch Conduits = 16

w = Unit Weight of Fill Material = 6

B_{d} = Width of Ditch at Top of Conduit = 2

W_{c} = C_{d}wB_{d}²

W_{c} = (16)(6)(2)²

W_{c} = (16)(6)(4)

W_{c} = 384

Therefore, the **soil load on rigid pipe** is **384.**

**Calculating for the Load Co-efficient for Ditch Conduits when the Soil Load on Rigid Pipe, the Unit Weight of Fill Material and the Width of Ditch at Top of Conduit is Given.**

C_{d} = ^{Wc} / _{w x B}_{d}^{2}

Where;

C_{d} = Load Co-efficient for Ditch Conduits

W_{c} = Soil Load on Rigid Pipe

w = Unit Weight of Fill Material

B_{d} = Width of Ditch at Top of Conduit

Let’s Solve an example;

Find the load co-efficient for ditch conduits when the soil load on rigid pipe is 40, the unit weight of fill material is 4 and the Width of ditch at top of conduit is 2.

This implies that;

W_{c} = Soil Load on Rigid Pipe = 40

w = Unit Weight of Fill Material = 4

B_{d} = Width of Ditch at Top of Conduit = 2

C_{d} = ^{Wc} / _{w x B}_{d}^{2}

C_{d} = ^{40} / _{4 x 22}

C_{d} = ^{40} / _{4 x 4}

C_{d} = ^{40} / _{16}

C_{d} = 2.5

Therefore, the **load co-efficient for ditch conduits** is **2.5.**