The bailer test: a simple effective pumping test for assessing borehole success

摘要: A new pumping test method has been designed around the practical requirements of those working in rural water-supply projects developing countries. The bailer needs only simple equipment and can be completed under 1 h. involves removing 20–50 bails from a borehole over 10-min period then measuring recovery. is analysed using large-diameter-well analysis (which accounts for well storage) appropriate testing low productivity aquifers (transmissivity 0.1–10 m2 d–1), where water levels are shallow (<20 m depth). was developed trialled supply project Nigeria it found to predict similar transmissivity 5-h constant rate tests (r 2=0.9). Analysis further simplified provide guidelines field staff such as community health workers. likelihood sustaining handpump 250 people indicated by maximum drawdown time 50 75% recovery comparing table. This now being used this other projects, modified indicate whether sustain higher yields small-scale irrigation.