[LINK] Saving Water in Libraries via the Web

[Richard Chirgwin]

Adam Todd wrote:
> At 01:43 PM 26/02/2007, Howard Lowndes wrote:
>>>> Whenever I play golf I have great annoyance at one of the $1M+ 
>>>> houses that overlooks the golf course having a feature water wall 
>>>> flowing from one level of their garden in to the swimming pool.  I 
>>>> acknowledge that it is almost certainly recirculating, but I can 
>>>> just imagine the unnecessary evaporation that is being promoted.
>>> And you're concerned even though you play golf on a well-watered 
>>> course?
>>
>> Yes the course is well watered - from the city's recycled water 
>> system, and from bore water.
>
> Doesn't sucking up the bore water lower the water table and increase 
> salinity?
Not in my understanding ... I had thought / read that the salinity 
process goes as follows:

1) Excess water at ground level lifts water table;
2) Rising water table brings salts towards the surface;
3) Vegetation suffers / dies, allowing water table to rise further;
4) Water table near surface evaporates, leaving salts behind.
= Salinity.

This happens whether the water is coming from an aquifer (ie, it wasn't 
available to 'surface' applications because it was in rock etc),  or 
from a nearby river (over-irrigation combined with clearing of heavy 
water-using trees).

RC
>
> <smile>
>
>
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