A downhole-type wellbore notching tool comprising: a cylindrical drum with a fluid inlet configured to be connected to a downhole end of a fluid conduit , the cylindrical drum having an outer surface along which is the fluid inlet, the cylindrical drum having a center and an inner surface; a plurality of fluid nozzles fluidically connected to an interior of the cylindrical drum and positioned around an outer circumference of the cylindrical drum , each of the plurality of fluid nozzles positioned to direct fluid away from the cylindrical drum and towards a wall of a wellbore to form a notch at a specified notching angle ; a rotatable collar positioned in the center of the cylindrical drum , the rotatable collar having an outer surface parallel to the inner surface of the cylindrical drum ; and a plurality of sleeve plates positioned between the inner surface of the cylindrical drum and the outer surface of the rotatable collar , each of the plurality of sleeve plates defining a hole with a diameter smaller than a diameter of a corresponding ball dropped through the fluid conduit , the corresponding dropped ball sized to trigger a specified notching angle ; wherein each of the plurality of sleeve plates is coupled to a respective gate across a respective fluid nozzle of the plurality of fluid nozzles , and wherein each of the plurality of sleeve plates is configured to i) hold the respective gate in a closed position, and when the corresponding dropped ball is received, and in response to a pressure build-up caused by the ball being seated on the sleeve plate , to ii) rotate around the rotatable collar to move the respective gate to an open position to direct fluid towards the respective fluid nozzle . a cylindrical drum with a fluid inlet configured to be connected to a downhole end of a fluid conduit , the cylindrical drum having an outer surface along which is the fluid inlet, the cylindrical drum having a center and an inner surface; a plurality of fluid nozzles fluidically connected to an interior of the cylindrical drum and positioned around an outer circumference of the cylindrical drum , each of the plurality of fluid nozzles positioned to direct fluid away from the cylindrical drum and towards a wall of a wellbore to form a notch at a specified notching angle ; a rotatable collar positioned in the center of the cylindrical drum , the rotatable collar having an outer surface parallel to the inner surface of the cylindrical drum ; and a plurality of sleeve plates positioned between the inner surface of the cylindrical drum and the outer surface of the rotatable collar , each of the plurality of sleeve plates defining a hole with a diameter smaller than a diameter of a corresponding ball dropped through the fluid conduit , the corresponding dropped ball sized to trigger a specified notching angle ; wherein each of the plurality of sleeve plates is coupled to a respective gate across a respective fluid nozzle of the plurality of fluid nozzles , and wherein each of the plurality of sleeve plates is configured to i) hold the respective gate in a closed position, and when the corresponding dropped ball is received, and in response to a pressure build-up caused by the ball being seated on the sleeve plate , to ii) rotate around the rotatable collar to move the respective gate to an open position to direct fluid towards the respective fluid nozzle . <EOS>