Bob is putting up a rainwater tank in Farmer Pickles' field, while Wendy builds a toy sailing boat for her nephew's birthday. A curious Spud sees Lofty pass by with the tank, and decides to help. While Bob is installing a sprinkler system in the lower field, Spud encourages the others to finish the job without supervision. Lofty drops the tank which rolls down the hill, splashing into the duck pond where it smashes the toy boat which Wendy has been testing. Bob returns to find the boat's mast smashed beyond repair. He asks Wendy to sort out the tank, while he heads back to the yard and fits the boat with a propeller mechanism to turn it into a speed boat. After a brief shower of rain, Farmer Pickles tests his new sprinkler system - Spud proves too curious again, and gets showered with water for his troubles.