They don't exist - correct Dundee. just look at the provided GPS data points for overflight with a overlay of waterways on Google and you'll see tributary and small stream as well as many larger ones in the paths of over flight. We all know how the monsoon delivery system works - spring and sling as the chopper pilots refer to it (or at least my mate who is now flying up on the oil rigs in the UK did). 100m to the edge of the target zone is minimal margin area as has been proven over the years.
I know DOC and E-pro will say that video of pellets in the waterways have been planted there, but who provides oversight of this program at a Governmental level DOC or MOH anyway? surely they need to provide proof as to steps taken to mitigate effects etc...for reviews of funding, resource consents and the like. I know if I did something on my land I'd be up the wazoo with red tape and inspections...
Buffer zones will mean bugger all to migratory aquatic species that forage en-route in the waterways eating tasty items such as snails, koura and other aquatic items, and one good downpour can relocate fish kilometers down stream not to mention their own migratory patterns.
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