We will have an absolute maximum (or minimum) at provided f(c) is the largest (or smallest) value that the function will ever take on the domain that we are working on. Also, when we say the âdomain we are working onâ this simply means the range of xâs that we have chosen to work with for a given problem.
Thompson's slope is about one percent, so each structure manages a zone of about nine acres. At $500 to $2,000 per structure, the drainage water management structures only added about five to 15 percent to the cost of upgrading the field's century-old drainage system.t $500 to $2,000 per structure, the drainage water management structures only added about five to 15 percent to the cost of upgrading the field's century-old drainage system.
Example: If the cost of installing tile drainage is $500 per acre and the expected annual net cash return in crop returns from tile drainage is $100 per acre, the payback period is 5 years ($500 / $100 = 5 years).xample: If the cost of installing tile drainage is $500 per acre and the expected annual net cash return in crop returns from tile drainage is $100 per acre, the payback period is 5 years ($500 / $100 = 5 years).