Here in Melbourne, like many parts of Australia, water is a precious resource. According to the
weekly update at the Melbourne Water website, Melbourne’s water
storages dropped by 0.2% of capacity in the week to 6
th November, despite some good rain in that time over Melbourne’s major catchments.
Our water
storages are now at 33.6% of capacity which is 118 billion litres lower than the same time last year, when they were 40.3% (715.2 billion litres) full.
The good news is that average daily water consumption was 1,028 million litres which was 83 million litres less than the previous week, and below the 1990s spring average of 1,246 million litres a day.
The weekly update concluded by saying Melbourne’s water authorities are encouraging four-minute showers and providing a free
showerhead exchange program to help save more water ahead of summer.
So, how much am I saving ahead of summer by daily sponge-bathing and a weekly bath?
Equipped with a bucket and a stopwatch, my daughters and I worked out the flow rate of our shower. Luckily my oldest daughter is a whiz at working out equations such as what the per minute
flowrate of the shower would be if a 12 litre bucket fills in 46 seconds (Answer: almost 16 litres per minute*).
Assuming I stick to the four minute shower in the morning and have a quick two minute one in the evening (and this is a big assumption...as sometimes the water is just so nice and warm, and the thinking time just too
irresistible...but go with me on this one) I'm using a total of
96 litres per day just in the shower.
My sponge bath option uses just 4 litres in a basin twice a day, plus I'll add an extra 8 litres four times a week to wash my hair over the hand basin. This averages to about
12.5 litres a day.
Where the 1930s figures start to blow out though is in the weekly bath. If I was being scrupulous about water-saving I'd only put a few centimetres into the bottom of the bath. But if it's the only bath I'm going to have all week, I know I'll be tempted to fill it to a reasonable level so I can soak. This could mean
up to 200 litres.
Even with the deep soaking bath option, my 1930s regime uses a total of
287.5 litres a week compared with the showering
672 litres per week.
Over the course of a year, I would save almost 20,000 litres.
I tried to think of a way to graphically represent that amount of water, then it came to me.

20,000 litres is about two-thirds the volume of our swimming pool.
Of course, if I just swam every day I could avoid the whole sponging/showering dilemma totally. It may be a chilly option in winter, my skin would dry out and I would smell of chlorine rather than soap, but I guess it's an option.
What are you prepared to do to save water?
*Please do not hesitate to correct me if any of my maths is wrong - it's been known to happen. And, I've now realised that this showerhead flowrate is excessive. A water-efficient shower head has a flowrate of less than 9 litres per minute. I will be looking at swapping to a water-efficient one.
Thursday...I shall report on 'bath day'.