I first saw the notice under the Table at this Water Corporation page on 26 August “rainfall instruments located at Victoria Dam and Mundaring Weir are being serviced and are not currently recording rainfall.” – there was no such notice on 1st August. I emailed the WA Minister for Water on 9 August Subject: “Audit required Perth dams rainfall”.
The Water Corporation notice has not changed in 2 months.
A Water Corporation staffer could have bought a couple of $10 rain gauges at Bunnings – plus a couple of star pickets and in the space of a few hours have functioning rain gauges again at the Mundaring & Victoria dam sites.
It simply beggars belief that in more than 60 days they still say the sites are “…being serviced and are not currently recording rainfall.”
After a wet weekend 15th-16th October WA Water Corporation recorded rain at only 2 of their 7 Perth dam rain stations on Monday morning the 17th.
You can check the widespread rain around Perth on 15th and 16th of October just click the Perth region on this AWN map and scroll down noting rain on that weekend.
Now the WA Water Corporation records rain 5 days a week at their dams at this page. I have kept many daily screen shots over several months and often the recording of daily rain by Water Corporation bears little resemblance to rain that we know fell in the district on the preceding day. So clearly the proviso at the bottom of their page about “rangers may not collect rainfall readings daily” is very very true.
In the case we are looking at – the widespread rain on 15th-16th Oct – for 5 of the 7 dam rain stations no rain data was collected up to 6 & 7 days later. Obviously with delays taking rain readings factors like evaporation could make readings less useful with every day that passes – but a week!! If they use electric gauges then they are subject to errors too. I do not know what goes on in Water Corporation but it is imperative that all of their daily rain data be made public so anybody can check how their taxes are being spent.
Table of most weather stations relevant to Perth dams rain – summing up how Water Corporation missed reading most rain on the weekend of 15-16th Oct 2016. Map of BoM rain stations and dam sites.
A week of pages saved from Water Corporation Rainfall at Perth Dams page-
Monday 17th Rain recorded at Canning & Churchmans but differently – only Water Corp could tally rain in different ways.
Tuesday 18th no change from 17th note the 14.6mm still shows in error at Churchmans
Wednesday 19th – 16.2 recorded at Wungong assumed from weekend
Thursday 20th exactly the same as 19th
Friday 21st 2.4mm added at Wungong
Note my 14 October blog – Obfuscating reply from WA Minister for Water re my call for rainfall audit
My emails asking for an audit are in comments.
My Table below from 15 Sep – of catchment stations with 2016 rain totals updated through August shows that the Mundaring Weir/Dam, Victoria Dam, Churchmans Brook, Serpentine Main Dam and Wungong Dam rain data all show many examples of disparate monthly totals that require an audit.
There have been misleading comments on TV news implying that BoM rain Outlooks predicted the heavy September rain in western Victoria that has caused flooding around Coleraine and Hamilton. This is not so as is shown on the September rain Outlook map below.
In the flooded zones the prediction was for 50-55% chance of exceeding the median rain.
Readers have mentioned rain in their areas and I have heard of road closures in the bush.
Added 14 Sep: The map compares Year To Date (YTD) rain with the Annual Mean.
Could not make this up. “Please note the rainfall instruments located at Victoria Dam and Mundaring Weir are being serviced and are not currently recording rainfall. We are working to address this and resume measurement as soon as possible.” Still no reply to any emails to WA Govt on this issue. They must release all their daily rain data so various sources can be compared. On 2nd August I posted – Perth dams rain data is in need of an audit. On 2nd May I posted – West Australian Govt Water Corporation fails to record March 2016 rain at several dams.
On the weekend I noticed this error in the BoM rain map –
I thought come Monday they will correct this to 9.27mm. Here we are Tuesday and no such luck, the error has gone into their daily rain numbers – presumably to be discovered in checks at a later date, weeks months away. It has also gone into 3rd party sites like AWN –
there could be others. It puzzles me that an error as gross as this lives on for 3 days – surely a little robot algorithm could flag outliers way less than this. I thought it was topical in view of my call for an audit of Perth dam catchments rain data.
“mem” has commented on information at the Melbourne Water web pages – inflows and storages. Using their csv file from the storage page I made this chart.
In March I blogged – Victorian Labor Govt moves to turn on the Wonthaggi seawater desalination plant – see my chart of Thomson Dam environmental flows –
I am short of time to add much until about 6 Sept – but can do quick blog housework.
From a Western Australian Govt report emailed me – Water Innovation. I have not located it online but could be related to this bumph.
Facts are that rainfall over the Perth-Peel urban areas, the catchment areas for the Gnangara and Jandakot Mounds, plus the Perth Hills water supply dams & and Wellington Dam catchments; would average over 7,000GL of free water from the sky per year.
This absolutely dwarfs any other water on their diagram as the Perth water supply totals about 4% of rain. The efforts of the WA Govt water authorities over decades have been to ignore the benefits of dam catchments management and to allow Perth dams to be effectively decommissioned, while taking Perth water supply to expensive seawater desalination. The Ancient Romans were far better water managers.
We need an audit of WA Govt dam catchments rain data.