This bar is referred to as HAUNCH BAR, it's generally provided in water tanks to resist the HORIZONTAL BENDING MOMENTS despite the fact that the tank walls are designed to withstand the total load and may act like a vertical beam or a cantilever without lateral supports
This type of bar are call as hunch bars. It is use where depth of section gradually increase. It helps in shear force, while designing the structure of u are taking the advantage of hunch you have to provide minimum requirements to full fill the minimum requirements as per code so extra reinforced is provided. We can not take direction it's advantage in bending moment. Because it will difficult to find neutral axis of that section. And force disperse at ratio 1:3 in different thicknesses of elements.