Just how big is this rain barrel? A barrel in my world is usually 55 gallons. It's about waist high and maybe a couple feet in diameter. The definition gets a little loose after that. The words tank and barrel are sometimes used interchangeably.
Something there does not compute. Intuitively it sounds way off. So, in my head, a barrel is ~ 3ft diameter? That gives an area of ~2.25 x 3 = 6 sq ft. Call it 5 sq ft. 20ftx20ft is 400 sq ft. Which is 80 times the area of the barrel. The barrel is about 4 ft high,
50 inches. Reduce 50 inches of water height by a factor of 80 and you have about 5/8" of water over 400 sq ft. Yes?
Which is an example of why I questioned looking at sump pumps. The OP said watering including a sprinkler. Typical sprinkler is expecting ~50 PSI.
Not likely to work for a sprinkler IMO.
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