Problem: A pump is to be selected for a waterfall in a garden. The water collects in a pond at the bottom, and the elevation difference between the free surface of the pond and the location where the water is discharge is 3m. The flow rate of water is to be at least 8 L/s.
(i) Select an appropriate motor-pump unit for this job and
(ii) Identify three manufacturers with product model numbers and prices.
(iii) Make a selection and explain why you selected that particular product.