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*[[Solution of the week 8|Solution 8: Constructing low-cost water tanks with ferrocement]]
*[[Solution of the week 9|Solution 9: The Rope Pump]]
*[[Solution of the week 10|Solution 10: Drilling boreholes in the kitchen, the story of Samuel and Hermelinda]]
*[[Solution of the week 11|Solution 11: Drilling boreholes the Bolivian way - the EMAS method]]
*[[Solution of the week 12|Solution 12: Hydraulic rams - making water run uphill]]
*[[Solution of the week 13|Solution 13: UNICEF goes manual drilling]]