If the project is in fact in Florida, there is a dewatering permit required. The type will likely depend on the requirements of the Water Management District the project is in. Typically, though you will need either a "No-Notice" Permit, a "Standard General" Permit, or an "Individual" Permit...
I am not certain I understand your question, but from the charts I remember there are three plots. The x-axis is typically, Q/Qfull, A/Afull, and/or n/nfull, while the y-axis is the ratio of depth of water in the pipe to diameter of the pipe, y/D.
I agree with Jartgo, a recharge well is the cheaper way to go than treated municipal water. However, if you do go for publicly supplied water, be sure to get a "Water Only" connection so you are not paying for sewer treatment as well.
To accommodate the water feature aesthetics, which is why I...
