Equation 21, for the "ID, potential flow" solution is very similar to Equation , for the "ID, radial" solution, differing only by the factor of 𝑒 within the natural logarithm. The factor 𝐷 𝐿 ⁄ is comparatively small for large values of 𝐿 𝐷 ⁄ and can thus be neglected. For reservoir length to well diameter ratios of 1000 (i.e. 𝐿 𝐷 = 1000 ⁄ ), Equation provides a reservoir impedance value approximately 15% smaller than Equation . The impedance value decreases to 22% for a ratio of 100. This decreased impedance using the "ID, potential flow" method (Equation ) is enabled by the infinite reservoir area, whereas the "ID, radial solution" (Equation ) has a finite swept volume.