Drainage facilities are rarely all natural. Even if there is a large natural water body adjacent to a development, runoff must be retained and treated to meet water quality requirements before it can be discharged into public waters. This is the norm for any development. Only the very smallest may be exempt or not have a need to provide ponds or other retention/treatment facilities to provide for runoff from the site.
There are very specific permitting requirements which must be met also. Just digging a hole is not even close to enough. Wetlands and other habitat areas are to be avoided, but if there are what development codes deem to be unavoidable impacts, compensation must be provided, usually in amounts more than the impacts they are compensating for. Many of the ponds, wetlands and other habitat areas in TV fall into this category...man-made facilities created as compensation for impacts in other areas of TV.
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