1.Hydrogeology and Groundwater Management in Botswana 1
2.Groundwater Resources Distribution and Vulnerability in Botswana 13
3.Economic Gains at the Expense of Health and the Environment？ The Effects of Artisanal Diamond Mining on Groundwater Quality in Koidu， Sierra Leone， and the Need for Protection 27
4.Improving Water Availability through Watershed Management in Africa 41
5.Rainwater Harvesting and Artificial Recharge in Africa 51
6.The Application of a New Stable Isotope Tracer（81 Br） in Groundwater Research 62
7.Modified Diatomite as Adsorbent for Removal of Heptachlor from Water 73
8.Geological Filtration Technology Applied to Remove Arsenic from Groundwater of Hangj inhouqi Area， China 81
9.Heavy Metals in Shallow Groundwater from Some Sites in Daye City of China 92
10.Spatial Distribution Characteristics of Heavy Metal Elements in Unsaturated Zone of Xiaodian Sewage Irrigation Area in Taiyuan 98
11.Experimental Study on Quantitative Assessment of Cr（Ⅵ）Reducibility Using δ53 Cr 108
12.Study on Arsenic in Groundwater under the Influence of Irrigated Agriculture In Hetao Plain， Inner Mongolia 117
POSTSCRIPT 129