When would I use a water pump?

Water pumps can be used for various tasks such as - 

• Emptying and filling ponds and pools Jacuzzis and hot tubs, to drain and clean or to refill
• Taking water from ponds or streams for irrigation tasks such as lawn sprinkling or watering plants
• Pumping floodwater from cellars or construction sites, holes, dips in a flooded garden and so on.