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Complete Book PDF (4.12MB) - World Bank eLibrary

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Rural Water Supply Corruption in Ethiopia 151<br />

Figure 4.2<br />

Typical Borehole Construction in Ethiopia<br />

surface casing<br />

grout<br />

casing<br />

soft weathered<br />

material<br />

grout or backfill<br />

grout<br />

sand<br />

unstable<br />

bedrock<br />

formation<br />

stabilizer<br />

screen<br />

waterproducing<br />

zone<br />

sump<br />

base plug<br />

Source: Ball 2009.<br />

For this reason, the most likely corrupt practice in the construction process<br />

is to drill short, as box 4.5 explains.<br />

Risk: low to medium. The available evidence from Ethiopia, and the perceptions<br />

of water sector stakeholders, indicates that corruption risk at this<br />

level is generally low to medium. Table 4.4 summarizes the findings of<br />

the study team and the views of workshop participants on some of the<br />

key issues.<br />

Survey results, summarized in the annex, were also discussed with<br />

workshop participants in Addis Ababa (as specified in table 4.4). In

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