Discounted cash flows (DCF), a business valuation technique, can be a real asset to you as a project manager, but in order to use its computation powers, you'll need to know where your money is coming from, and how long it will take to reach you. When you get a grasp of these details, you can use DCF and other business valuation principles to see what your project bank accounts will really look like.
For example, if you are mainly funded by some public agency that disburses its money annually, you will be able to make annual estimates that you can plug into DCF software tools along with tax and currency data. The software tools will come back with actual values of these cash injections with consideration of the factors that influence cash value over time.
Additional sources of funding, such as private donations, are another representation of how a human project manager and valuation software work together. The PM will figure out estimates for donation amounts and times that they are expected to be received and the DCF software will crunch the numbers and see what value those donations will bring to the table.