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UNHCR Handbook for Emergencies - UNHCR eCentre

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214<br />

Figure 1a – Needs and Resources Assessment<br />

General considerations <strong>for</strong> planning an emergency water supply system<br />

Is sufficient<br />

water<br />

available?<br />

Yes<br />

Is the<br />

water safe to<br />

drink?<br />

Needs Assessment<br />

1. Estimation of total daily needs<br />

2. Initial water resources assessment<br />

No<br />

Hydrogeological<br />

survey<br />

Well digging,<br />

portable rigs<br />

Can water<br />

be made available<br />

at this site?<br />

Yes<br />

Can an<br />

adequate system<br />

be put in place<br />

in time?<br />

Yes<br />

Is source<br />

rain, surface or<br />

groundwater?<br />

Surface water Rain water Groundwater<br />

Groundwater<br />

Is aquifer<br />

consolidated or<br />

unconsolidated?<br />

Conventional rotary<br />

drilling<br />

No<br />

Unconsolidated Consolidated<br />

No<br />

Select new site<br />

Water tanker operation<br />

Spring<br />

“Down the hole”<br />

hammer drilling

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