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Water can be abstracted from the sand and gravel upstream of the sand dam via a well or tubewell Good if area upstream of dam is protected Can be constructed across seasonal river beds on impermeable bedrock Sub surface dams Low local labour and ma

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WHFKQRORJUHTXLULQJQRWUHDWPHQWQDGGLWLRQDOEHQHWLVWKDWXVLQJWKHIRUFH KHUVWSKDVHLQWKHFUHDWLRQRI SURMHFWQXHQFLQJIDFWRUVLQFOXGH DQGWKHTXDQWLWDQGTXDOLWRIRZ KHFRPPXQLWLHVWKDWEHQ






Presentation on theme: " WHFKQRORJUHTXLULQJQRWUHDWPHQWQDGGLWLRQDOEHQHWLVWKDWXVLQJWKHIRUFH KHUVWSKDVHLQWKHFUHDWLRQRI SURMHFWQXHQFLQJIDFWRUVLQFOXGH DQGWKHTXDQWLWDQGTXDOLWRIRZ KHFRPPXQLWLHVWKDWEHQ"— Presentation transcript: