"I compare this with putting out a bucket in a rainstorm. Assuming the rainfall is constant, the amount of water that accumulates in the bucket tells you how long it was exposed."
"I compare this with putting out a bucket in a rainstorm. Assuming the rainfall is constant, the amount of water that accumulates in the bucket tells you how long it was exposed."
I presume to assume that has some significance?.................
I think you missed the larger point of that sentence.
He might have better said ‘GIVEN a constant rate of rainfall....’