Frac-pack treatments and hydraulic fracturing are successful completion procedures for high-permeability formations. In these "soft" rock formations, permeability, thus fluid loss, is a key design parameter. Often high fluid loss is accounted for by use of high fluid-loss coefficients, which do not describe the process. One possible cause of the inconsistency might be non-ID (i.e., nonCarter type) loss behavior. Non-ID fluid loss occurs in water-injection and water-disposal fractures. ID loss is valid if the fracture propagation is greater than loss velocity; this condition is not true for waterflood-induced fracturing.