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Page vi 5.2 Current Operational Practices in Ghana 74 5.3 The Asafo Simplified Sewerage Scheme 76 5.4 Proposed Operational Practices 77 5.5 Conclusions 89 5.6 References 90 6 A Low-cost Sewerage System for a Small Rural Community on a Greek Island 91 6.1 Introduction 91 6.2 Current Sewerage Provision 93 6.3 Design Considerations 94 6.4 Final Design 98 6.5 Conclusions 100 6.6 Bibliography 100 7 Settled Sewerage in Africa 103 7.1 Introduction 103 7.2 Settled Sewerage in Zambia 105 7.3 Settled Sewerage in Nigeria 107 7.4 Conclusions 108 7.5 References 108 8 Hydraulic Design of Unconventional Sewerage 111 8.1 Introduction 111 8.2 Historical Discussion 111 8.3 Conventional Design 114 8.4 Unconventional Sewerage 117 8.5 Conclusions 120 8.6 References 121 9 Small Diameter Gravity Sewers: Experience in the United States 123 9.1 Introduction 123 9.2 Historical Development and Use 125 9.3 Design Guidelines 127 9.4 Management 131 9.5 Construction Costs 131 9.6 Summary 132 9.7 References 132 10 The Colombian ASAS System 135 10.1 Introduction 135 10.2 Development of the ASAS System 135
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