[Greenbuilding] tennis court surface material

[Chris Green]

Corwyn wrote:
>
> On Oct 02, 2007, at 20:37, Chris Green wrote:
>
>> Looking for some greener references for creating a tennis court surface.
> My grandfather created a tennis court, which my family has been using 
> ever since.  
Cool!
> Over the course of 80-odd years the level of the clay has dropped 
> relative to the surrounding grass by about 3/4".
The other way to look at it is that the soil around the court  has grown 
by a good part of that 3/4": this is what happens in England, for 
instance, and over the centuries the rising soil ( because of earthworms 
doing their thing and adding to the soil) eventually buries things like 
the mosaic floors of 2,000- year old Roman villas, medieval foundations, 
and so-on. Archaeologists sometimes use the depth of soil covering sites 
to determine how old they are since the rate of soil production is known 
for much of the country. It can be an inch or two a century.
In some 500-year old buildings, the door step that was once above grade 
can be 6-8" and possibly more below grade now.

Cheers,

Chris Green.