"David Hare-Scott" wrote in message
...
brooklyn1 wrote:

And I don't know why anyone would need more than 100 gallon tank to
collect rain water for watering some plants around ones abode, and
that's more of a head trip than a real money saver.

Some people have gardens rather than a few plants.

Anyone who lives
where they can keep say a 1000 gallon tank filled with rain water
doesn't really need to be collecting rain water if it rains that
much.

Not true, you haven't thought this through. There are places where annual
rainfall is quite high but very seasonal or very erratic. You need to
save when it rains to water when it doesn't.

That's true of most any area, no one can accurately predict weather. But no
matter how much it rains in any one period if it hasn't rained in awhile adn
likely won't rain anytime soon then you couldn't collect water at the rate
it needs to used for any but container gardening. Watering the ground where
it rains sporadically will literally be fruitless.

This entire concept of collecting rain water in huge tanks
where it hardly rains is really pretty silly... the point of
diminishing returns is reached at about 100 gallons, probably more
like a 55 gallon drum... begins to cost more to transfer and haul
than to turn on the hose bib.

What if there is no hose bib connected to mains supply?

Now I know you're not serious.

No one is going to maintain a lawn in say Las Vegas with
collected rain water no matter a 5,000 gallon tank, a lawn will drink
up water in the desert faster than it rains.

Watering lawns will indeed require huge investment in a desert, I for one
would not attempt to grow a lawn in a desert.

Nor should one attempt to grow a garden in a dessert, not unless they have a
constant piped in water source... like the Colorado River.

With all your theoretical "what-ifs" you ought not to be gardening period.