A method of dynamically allocating a total amount of Produced Water from a reservoir during enhanced oil recovery via a low salinity or softened water EOR flood, the method comprising: receiving measurement data associated with a reservoir, a PW, and a low salinity or softened water, wherein the measurement data comprises: a PW production rate from the reservoir, a low salinity or softened water injection rate, an injection water compositional envelope, and a total water injection rate; receiving reservoir configuration information comprising: one or more EOR injection zones, an EOR injection rate associated with each of the one or more EOR injection zones, one or more disposal injection zones, a disposal zone injection rate associated with each of the one or more disposal injection zones, one or more non-reinjection disposal routes, and a non-reinjection disposal rate associated with each of the one or more non-reinjection disposal routes; determining a blending rate comprising at least a portion of the PW production rate and at least a portion of the low salinity or softened water injection rate to provide a blended injection fluid, wherein the blending rate maintains a composition of the blended injection fluid within the injection water compositional envelope; blending at least a portion of the PW with at least a portion of the low salinity or softened water at the blending rate; and dynamically allocating the PW production rate among: (a) reinjection into the reservoir via the blending with the low salinity or softened water and injection into the one or more EOR injection zones, injection into the one or more disposal injection zones, or a combination thereof; (b) disposal through one or more non-reinjection disposal routes, or a combination thereof, wherein the dynamic allocation maintains the EOR injection rate, the disposal zone injection rate, and the non-reinjection disposal rate below predetermined thresholds, results in reinjection or non-reinjection disposal of the entire PW production rate, and meets a total voidage replacement rate whereby the sum total of the amount of water reinjected in (a) equals a voidage requirement. receiving measurement data associated with a reservoir, a PW, and a low salinity or softened water, wherein the measurement data comprises: a PW production rate from the reservoir, a low salinity or softened water injection rate, an injection water compositional envelope, and a total water injection rate; receiving reservoir configuration information comprising: one or more EOR injection zones, an EOR injection rate associated with each of the one or more EOR injection zones, one or more disposal injection zones, a disposal zone injection rate associated with each of the one or more disposal injection zones, one or more non-reinjection disposal routes, and a non-reinjection disposal rate associated with each of the one or more non-reinjection disposal routes; determining a blending rate comprising at least a portion of the PW production rate and at least a portion of the low salinity or softened water injection rate to provide a blended injection fluid, wherein the blending rate maintains a composition of the blended injection fluid within the injection water compositional envelope; blending at least a portion of the PW with at least a portion of the low salinity or softened water at the blending rate; and dynamically allocating the PW production rate among: (a) reinjection into the reservoir via the blending with the low salinity or softened water and injection into the one or more EOR injection zones, injection into the one or more disposal injection zones, or a combination thereof; (b) disposal through one or more non-reinjection disposal routes, or a combination thereof, (a) reinjection into the reservoir via the blending with the low salinity or softened water and injection into the one or more EOR injection zones, injection into the one or more disposal injection zones, or a combination thereof; (b) disposal through one or more non-reinjection disposal routes, or a combination thereof, wherein the dynamic allocation maintains the EOR injection rate, the disposal zone injection rate, and the non-reinjection disposal rate below predetermined thresholds, results in reinjection or non-reinjection disposal of the entire PW production rate, and meets a total voidage replacement rate whereby the sum total of the amount of water reinjected in (a) equals a voidage requirement.