All calculations are based on the conversion of one inch of rainfall over one square foot=0.56 gallons.

Section one covers approximately 200 square feet of catchment area and 180 square feet to be watered.  The need will be filled by the pond, from which water will be pumped through a hose with a low wattage solar pump. It will water 2 beds, and 4 fruit trees.

Section 2 covers approximately 100 square feet of catchment area and 60 square feet to be watered.  The need will be filled by a 200 gallon recycled barrel.

Section 3 covers approximately 200 square feet of catchment and 165 square feet to be watered. The need will be filled by two 150 gallon barrels.

month average rainfall expected catchment rainfall received by plants water need
June  0.5 inches 56 gallons 50.4 gallons 50.4 gallons 
July  0 inches  0 gallons  0 gallons 100.8 gallons
august  0.25 inches 28 gallons 25.2 gallons  75.6 gallons
September 0.75 inches 84 gallons  75.6 gallons  25.2 gallons
season total 1.5 inches 168 gallons  151.2 gallons 252 gallons
June  0.5 inches  28 gallons  16.8 gallons  16.8 gallons
July  0 inches 0 gallons  0 gallons 0 gallons
august 0.25 inches 14 gallons  8.4 gallons  8.4 gallons 
September 0.75 inches 42 gallons  25.2 gallons  25.2 gallons
season total 1.5 inches 84 gallons 50.4 gallons 50.4 gallons
June  0.5 inches 56 gallons  46.2 gallons  46.2 gallons
July 0 inches 0 gallons  0 gallons 92.4 gallons
august 0.25 inches 28 gallons 23.1 gallons 69.3 gallons
September 0.75 inches 84 gallons 69.3 gallons 23.1 gallons
season total 1.5 inches 168 gallons 138.6 gallons 227.4 gallons