A river crosses an unconfined alluvial aquifer and enters a large reservoir. The saturated thickness of the aquifer at the location where the stream enters the reservoir is 65 ft and its hydraulic conductivity is 12 ft/d. If a production well with radius 0.5 ft is placed at a distance of 'a' = 200 ft from the reservoir and 'b' = 250 ft from the river, what is the maximum possible long-term production rate? Develop an expression for the effective radius of influence of the well for this situation, similar to Equation 3.2.25.