If I lived in a tornado region and was already installing an undergroundshelter, I could see making modifications to give the shelter an additional function. As others have pointed out, $16,000 (plus install costs?) for a single use structure would be quite pricey.
Gypsy B. : Yes I totally agree! Safe Spring Development is truly a lost art ! I would love for this subject to blossom as an entire thread of its own !
Cleaning out the spring at the point it 1st leaves the ground and maintaining the spring hour over it is itself loaded with danger !
Geoff Lawton on the other hand points out that often all that is needed to develop a spring on your property is the dynamic use of Swales, catch basins,
and clever overflow areas to feed downslope water tables !