| The area-perimeter relation can be applied to rivers, if |
| Ai is the area of the basin drained by the river, |
| and |
| Pi is the length of the longest branch of the river. |
| both measured at length ri, then we expect
|
| Measurements of this sort were made by Hack. |
| Choosing a reference length r1 and plotting |
| Log(A1/Ai) versus Log(P1/Pi) |
| gave points approximately on a straight line
of slope |
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