On Monday, 7 hours of rain at a rate of 1 inch per hour is 7*1=<<7*1=7>>7 inches of rain.
On Tuesday, 4 hours of rain at a rate of 2 inches per hour is 4*2=<<4*2=8>>8 inches of rain.
Twice the rate of Tuesday is 2*2=<<2*2=4>>4 inches per hour.
Wednesday, 2 hours of rain at a rate of 4 inches per hour is 2*4=<<2*4=8>>8 inches of rain.
The combined total of the rainfall for these three days is 7+8+8=<<7+8+8=23>>23 inches of rain.
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