Nolte Graph (IMAGE) Purdue University Caption A graph of the scaling relationship between fluid flow and fracture stiffness is shown. The shape of the symbol indicates the fracture length scale from 0.0625 meter (circles) to 1 meter (triangle) and the colors correspond to different apertures. Credit (Image courtesy of Pyrak-Nolte) Usage Restrictions For non-commercial use only License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.