Which of the following sources of water is least useful for irrigation purposes? by Sunday | Jun 12 | Agricultural Science WAEC | 0 comments A. sea B. river C. lake D. borehole Correct Answer: Option A – sea Users Also Read These:Which of the following methods of irrigation is most…A tap supplies water at 30°C while another supplies…The system of irrigation whereby water is introduced…An immersion heater rated 2.0A; 240V is used to boil…A quantity of hot water at 100ºC is added to 400g of…