Today i will be teaching us how to Estimate for soakaway pit. I know i have done something on this topic before now but i just want to give a more detailed estimate for students that may want to know how to do this and other professionals too!

So for this project, i will be giving estimates for a soakaway pit measuring 4268mm by 3048 (14 by 10 ft) and the estimate will provide for materials such as steel, cement, granite, wood (Boards and 3 by 4), blocks, binding wire, stirrups, sand, etc

Figure 1 Showing the dimensions of a soakaway pit |

Lets ask a very important question here

#### How many Blocks Do i need to construct a soakaway Pit?

For the septic tank under review, we have its length as 4268mm or 14 ft while the width is 3048mm or 10 ft and it also has a depth of 3048mm. Now lets estimate for the number of blocks required to carry out this project

From previous experience along with some basic mathematics, we have that the length of block is about 450mm

We also know that the height of a block is about 228mm and so we are going to try to get the number of blocks for every course as well as the number of blocks for each side of the pit

Lets not forget that the pit is 3048mm high and to get the number of coaches for soakaway pit, we have to divide the total height (3048mm) by the height of one block (228mm)

Thus, (3048/228) = 13.3 blocks high. Lets just assume its is 13 blocks high since we will be using Mortar for bonding

Having obtained the total number of courses as 13, let us estimate for the total number of blocks…

For Side A measuring 4268mm, we are going to divide this 4268 with the length of a block “450mm”

Thus, (4268/450) = 9.4 blocks

But we have 13 courses

Therefore, the total number of blocks for side A Would be 9.4 x 13 courses = 123 blocks

We are going to multiply this 123 blocks by 2 because we also have side “C-D”

123 X 2 = 246 Blocks

Next, we estimate for the number of blocks to over side “B-D”

Dimension for sides B-D = 3048mm, we also understand the length of block is 450mm and there will be 13 courses

Therefore, let us divide 3048mm by 450mm

3048/450 = 6.7 blocks

6.7 x 13 courses = 87 blocks

We have 87 blocks for side B-D, So we multiply by 2 in order to provide for sides A-C since they both have the same dimensions

87 x 2 = 174

So the total number of blocks required for this septic tank project will be 174 + 246 = 420 blocks but we will add 42 for breakages

So the **total number of blocks required would be 462 Blocks**

### How many Bags of cement would be required For a Soakaway Pit?

462/60 = 8 bags of cement (From experience, we need a bag of cement to lay 60 blocks)

#### How Much Binding wire is required for soakaway Septic tank Construction

For the Project under review, make available N1500 for Binding wire

### How much Reinforcements for soakaway Septic tank

### Reinforcement for Columns or Pillars

**In Total, we need 24 Lengths of 12mm rods for the job**

**Casting Of Top Slab**

**Boards for top casting**

**Nail**

**3 by 4 Wood for bracing**

**Bushwood or Bamboo for Support of formwork**

### Materials Needed for Building Septic Tank Soakaway

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