Page 21 - Surveyor 50.2 2015
P. 21
Surveying the Condition of a Selected Flat Roof for Possible Water Ponding Defect
Vol.50 No.2 2015
Figure 11: Condition of RWDP 9 Figure 12: Condition of RWDP 10
Figure 13: Condition of RWDP 11 Figure 14: Condition of RWDP 12
Figure 15: Inefficient flow of water due to the presence of dirt
dirt around the RWDP areas. Rain water does not around RWDP 2
efficiently flow through the RWDPs due to the
presence of dirt, and perhaps the flat roof surface is
not well directed to the respective RWDP (inefficient
flat roof fall). In order to support this argument, water
ponding test was carried out on RWDP 2. The water
was poured to the RWDP 2, and indeed we found
that the flow was slow (not efficient) due to the
presence of dirt around it. Once the dirt was cleaned,
the water efficiently flowed through it. Figures 15
and 16 show the comparison of water flows before
and after cleaning the area surrounding RWDP 2,
respectively.
In order to identify the most critical RWDP in this
flat roof area, Table 1 shows the criticality level of all
RWDPs in term of presence of water ponding, dirt,
and height of dirt.
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