STEP 5

STEP 5. PREPARING THE BLANK MODEL
Once the base map is properly introduced to the participants, the building of the blank relief model may now commence. The blank relief model is basically the 3-dimensional representation of the topography of the community.

Table 7 shows the step-by-step procedure to build the blank relief model. For the purpose of illustration, we will be using polystyrene as the base material of the blank relief model.

Step-by-step process Materials Illustration
1. Divide participants into four groups with particular tasks to:a. 1st group – Attach pieces of polystyrene

b. 2nd group – Affix the carbon paper and then later to trace the contour line from the base map to the polystyrene

c. 3rd group – Cut the polystyrene

d. 4th group – Superimpose layers of polystyrene using glue and a few nails

 Step1.
2. The 1st and 2nd group should begin affixing the polystyrene and carbon paper with the same size as the base map while the third and fourth groups are on standby. PolystyreneCarbon paper

Brown tape

Scotch tape

 Step2a Step2b
3. The 1st and 2nd group then may superimpose the base map, carbon paper and the polystyrene in the following order:Top – Base map

Middle – Carbon paper

Bottom – Polystyrene

Fix them by using double clip to ensure that they will not move

Double clips  Step3Step3b
4. The 2nd group should start tracing the contour line of the base map one at a time starting from the lowest number (which implies the lowest elevation). The contour line will be transferred to the polystyrene through the carbon paper. Pen or any sharp object that can be used to trace the line  Step4
5. Once the tracing is done, the polystyrene at the bottom should be removed and transferred to the 3rd group. The 3rd group may then cut the polystyrene along the traced line.Take the part of polystyrene which corresponds to the given elevation (i.e. within the contour line). Remove the other parts and keep it for later small layers. Cutters  Step5
6. The 4th group should receive the polystyrene from the 3rd group and start putting glue on its surface. Glue made from starch or commercial glue  Step6
7. Step 2-6 should be repeated with the following conditions to produce the second layer:Step 2 – The same carbon paper can be used until the last contour time, there is no need to affix another one.

Step 4 – The second lowest elevation should be traced.

Same materials as Step 1-6
8. The 4th group should receive the 2nd layer of polystyrene and overlay it on top of the 1st layer. The 1st and 2nd layers of polystyrene should be well fastened by the glue and potentially with a few thin nails. Glue made from starch or commercial glue and nails  Step8
9. Step 2-9 should be repeated until the last contour line with the following condition:Step 4- trace 3rd lowest elevation to produce the 3rd layer of polystyrene, 4th lowest elevation to produce the 4th layer, and so on. Same materials as Step 1-9
Remarks: After finishing the last contour line, mountains, river channels and plains should be evident despite the ladder-like appearance of the slope.  LastStep

Table 7– An example of step-by-step procedure for building a blank relief model

Figure 23: Discrepancy between the slopes depicted on the base map of Caringo Island, Mercedes,  Philippines, and the reality of the field (Kristine Marie Sadac, December 2012)

Figure 23: Discrepancy between the slopes depicted on the base map of Caringo Island, Mercedes, Philippines, and the reality of the field (Kristine Marie Sadac, December 2012)

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