The water intake must be screened - see below.
The water intake must be inside a screened box or bucket. It may be weighted so that it sits on the stream bottom. The screens should be at least 12 inches above the stream bottom.
For details about screening the intake, see End-of-pipe fish protection screens for small water intakes in freshwater
.There is a government Water Sustainability Act Home Page.
The Environment Ministry has its Water Sustainability Act main page.
if you plan to pump water, and you need a bigger pump or you do not qualify as a Hand Miner, you must apply for...
To get a water licence, it may be necessary to do a Notice of Work application to obtain a Reclamation Permit, even if you don't otherwise need one.
Water Licensing & Rights,
which has general information and links including...
Water Licences & Approvals,
which has a variety of links, including...
Apply for a Water Licence,
which has a lot of information, including...
There are a few pages that will be relevant to some people - pages with a name that contains the phrase "Changes in and About a Stream". Generally, you want to avoid doing anything that could be called "making changes in and about a stream - legally, it makes things much more complicated.
For a machine-digging operation, these are not large costs. For a modest hand-digging operation, these are significant costs, possibly comparable with the other major out-of-pocket expense - travel expenses.
1 US gallon | = 3.785 Litres | so 50 gal | x 3.785 | = 189 L |
1 Imperial gallon | = 4.546 Litres | so 50 gal | x 4.546 | = 227 L |
1 Imperial gallon | = 1.2 US gal | so 50 Imp gal | x 1.2 | = 60 US gal |
1 Cubic Metre ("m3") = 1000 L = 220 Imp gal = 264 US gal
Pump Size | US gal/min | Litres/min | cubic metres/hr |
1.5 inch | 50 to 100 | 200 to 400 | 12 to 24 |
2 inch | 100 to 200 | 400 to 800 | 24 to 48 |
The stated capacity was 74 gpm which is 280 L/min
280 L/min / 1000 l/m3 = 0.28 m3/min
0.28 m3/min x 60 min/hr = 16.8 m3/hr
If you know the conversion factor, but you don't know whether you should multiply or divide, first decide whether the result is going to be larger or smaller than the starting number.An individual small-scale placer miner might run the pump at 1/3rd to 2/3rds capacity - 6 to 12 m3/hr.
At 5 hrs/day: 6 m3/hr x 5 hrs/day = 30 m3/day to 12 m3/hr x 5 hrs/day = 60 m3/day
At 10 hrs/day, double those to 60 to 120 m3/day
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