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Joined: 25/10/2019(UTC) Posts: 3  Location: Ocean View Thanks: 1 times
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We have all heard of dramatic differences in rainfall between properties that can be neighbours. What are the thoughts of those gathered on this forum? (i.e., I surmise that we are not far from the Ocean View weather station but both my next door neighbour and I usually get much more rain than Ocean View.)
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Joined: 25/08/2019(UTC) Posts: 1,839 Location: Ferny Grove Thanks: 985 times
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One thing to remember is how the rainfall is measured, is an automatic gauge or manually read gauge, what is the collection area of the funnel, the shape of the funnel and for automatic gauges the accuracy of the gauge at high rainfall rates as well as the resolution of the gauge (e.g. 0.2 mm ideally or as bad as 1 mm). And the actual siting whether at ground level, elevated or somewhere in between and significant under catch can be experienced with elevated gauges which I have found myself, and surrounding obstacles like trees and building. But considering all that I do find that being on the edge of the southern extent of D'aguilar it provides some shielding to the west at my location (with lower rainfall totals) especially with severe storms. |
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I was white water kayaking the upper Tweed River more years ago than I care to remember and spoke to a farmer who claimed his annual rainfall was between 250 and 500 mm less than his next door neighbour.
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Joined: 31/08/2019(UTC) Posts: 118 Location: Nandewar Ranges, Northwest NSW Thanks: 257 times
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Rainfall varies around my location depending on which direction it comes from. Most comes in from the West/West South West & is usually heavier either to the south or north of town by 1 to 2 Km. Amounts can be 30 to 50 percent higher.
As for rain gauges, I have 3 different types within 50 meters of each other & all measure different amounts. The BOM gauge in the back paddock is the standard 8 inch funnel mounted 300 mm above the ground. The AWS one is mounted 6 meters above the ground & the standard garden variety one is 180 cm off the ground mounted on the colourbond fence.
In a heavy downpour last week(20 mm in 15 minutes) there was a 5 mm difference between the three with the BOM gauge registering the least & the standard one the most.
I suspect that the hole in the funnel of the BOM gauge could not handle the amount of rain collected & some spilled over, although i cannot verify this. Being an official BOM site this is the reading I have to report. |
2020 YTD Rainfall - 415.0 mm |
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