What size of structure to order
The following questionnaire and worked example in Table7 is
based on one transit store but could be applied to a whole emergency
distribution system of port store, regional stores and district stores.
Table 7: Store size calculations
When the actual required floor area, B, has been calculated, the
warehouse dimensions can be determined. For economy these should be chosen from
the supplier's standard range. Thus, if a 15 m span is standard, length required
is 562.5 /15 = 37.5 m. The nearest multiple of the standard bay length may then
be selected, e.g. 39 m for 3 m bays.
For tarpaulin quantities it is economical to order standard
sizes of sheet, e.g. 7.5 x 10 m. Using one as the ground sheet, allowing 1 m
margin all round, this will support a stack of 5.5 m x 8 m x 2 m high as before.
Then stack volume 
= 88 m³ 
Stack weight (calculated as rice) 
=88 /1.5 tonnes 

=59 tonnes. 
Two further tarpaulins 7.5 x 10 m each will easily cover the
stack allowing for 1m overlaps. Hence a total of three will be required for a 2
m high stack of 59
tonnes.