Looking for a rectangular flat rainwater harvesting tank

Calahonda52

I haven't looked at all prior posts so have not found one that matches my exact criteria:D

Some years ago I did have a thread here on such a tank, from the UK, but wonder in the intervening years has the show moved on with a wider range.

I know its not a cost effect project but the garden is being dug out in one spot as I have a collapsed sewer pipe so thinking of availing of the work to just bury one now.
Thanks as always

eg
https://www.tanks.ie/water-tanks/water-storage-tanks/underground-water-tanks/2900-litre-underground-water-tank.html#product_tabs_dimensions

Dudda

Their refered to as shallow dig tanks and are way more expensive than the traditional cylinder or round ones. If you've a digger on site you're far better off digging a bigger hole for the traditional cheaper tank. I don't have great access on my garden so was looking for the shallow dig tanks as it would be by hand but couldn't justify the price and don't have the time or energy to dig a bigger hole so it hasn't gone in yet.

Calahonda52

Thanks, I had not considered the mula aspect: you are right.
No digger on site and no room for one

A big downside with one I linked is that the stem is about 750 mm so thats a lot of digging/backfilling over the rest of it

Did you find may different types of flat?

this is a better idea
http://www.halstedrain.com/rainwater-products.html

but are v pricey!

ht9zni1gs28crp

Cast a tank yourself? Dig your hole, set your intake and exit levels. Shutter away.....

Calahonda52

Genesis Huge Cupboard wrote: »

Cast a tank yourself? Dig your hole, set your intake and exit levels. Shutter away.....

This did occur. How would you cover it?

ht9zni1gs28crp

Calahonda52 wrote: »

This did occur. How would you cover it?

2nd Casting, extend and bend your mesh, shutter away. Leave a standard size access slot. Then use standard off the shelf conc covers you see on the chambers already on the market.

Metric Tensor

Or cover with precast slabs if preferred!

You could even build internal walls (with opes obviously) to reduce spans and thus increase tank size.

ht9zni1gs28crp

Incidentally, it amazes me how much waste water we actually use. I have a 7500litre rainwater tank in the garden. We had a prolonged dry spell in May and for the first time I saw the tank at half full....

excuse the pun but that speaks volumes on waste. We run three toilets, dishwasher and a washing machine off it. Two adults and one kid.....

Johnnyhpipe

Genesis Huge Cupboard wrote: »

Incidentally, it amazes me how much waste water we actually use. I have a 7500litre rainwater tank in the garden. We had a prolonged dry spell in May and for the first time I saw the tank at half full....

excuse the pun but that speaks volumes on waste. We run three toilets, dishwasher and a washing machine off it. Two adults and one kid.....

Cool. I've never heard of a system that can supply the dishwasher too. How is the water treated? Most of the UV treated systems we've used still won't guarantee the water as being fit for consumption and supply for toilet flushing only.

ht9zni1gs28crp

Johnnyhpipe wrote: »

Cool. I've never heard of a system that can supply the dishwasher too. How is the water treated? Most of the UV treated systems we've used still won't guarantee the water as being fit for consumption and supply for toilet flushing only.

Does your dishwasher not wash the dishes hot? :cool:


Edit: And one other tip. A stand alone tap for outside use would be a great addition. Makes rinsing the car after a wash a joy as it leaves a streak free finish

oppenheimer1

Genesis Huge Cupboard wrote: »

Does your dishwasher not wash the dishes hot? :cool:


Edit: And one other tip. A stand alone tap for outside use would be a great addition. Makes rinsing the car after a wash a joy as it leaves a streak free finish

I don't think any dishwasher gets hot enough to disinfect water. Furthermore boiling it won't remove potential contamination from heavy metals (like from lead flashings).

dathi

Calahonda52 wrote: »

This did occur. How would you cover it?

i used an ibc left the cage on it poured conc slab in bottom of hole and filled it up with water and poured concrete around sides used concrete lintels for lid and manhole for access you can get loads of pipe fittings from anyone that sell "koi pond filters" on the net

Johnnyhpipe

Genesis Huge Cupboard wrote: »

Does your dishwasher not wash the dishes hot? :cool:


Edit: And one other tip. A stand alone tap for outside use would be a great addition. Makes rinsing the car after a wash a joy as it leaves a streak free finish

Raintraps etc are fine for connecting to taps to feed the dog, water the flowers... Most people don't wash the car due to the grit content which doesn't look good on a black polished car..

I'm sure your dishwasher is working fine. However even with UV filtering I wouldn't shower in it nor would I wash my dishes. We have specified quite a number of these units throughout the country and have not seen one that would be recommended for anything other than flushing toilets/irrigation. That's not to say they don't exist, just that I haven't come across it. So as I say, yours may well be fine.

Calahonda52

This is the theory!
The D/W issue here, as opposed to the C/W is that the D/W can be opened mid way through the cycle and the warm misty water vapour may contain pathogens such as Legionella's.

Of course that was fine when one was clothes washing at 60 plus C, and makes no sense now when you can wash at 30 C which is a prime time temp for pathogenic growth .
For a single UV source to work properly the filtration must leave nothing large enough for bugs to hide on the leeward side from the lamp.
The Galway issue years ago was cryptosporidium, which at 3 to 6 microns, needs more than Specsavers for serious pursuit

ht9zni1gs28crp

Johnnyhpipe wrote: »

Raintraps etc are fine for connecting to taps to feed the dog, water the flowers... Most people don't wash the car due to the grit content which doesn't look good on a black polished car..

Grit in the rain water, at time of extraction after its gone through filters? hmmmm not sure on your direction on that one. Correctly cleaning/detailing your car you start with a grit catcher in your two buckets regardless of source of water....

Johnnyhpipe wrote: »

I'm sure your dishwasher is working fine. However even with UV filtering I wouldn't shower in it nor would I wash my dishes. We have specified quite a number of these units throughout the country and have not seen one that would be recommended for anything other than flushing toilets/irrigation. That's not to say they don't exist, just that I haven't come across it. So as I say, yours may well be fine.

Ill double check the specs on the kit but i recall going through all this with the supplier at install.