Just water it deeply to prevent surface roots, and prune it to U
crotches instead of V crotches.

My entire block (~35 homes on each side of the street) was planted
with Japanese zelkova as the street tree about 32 years ago. Many
still remain.

My nextdoor neighbors lost theirs just two weeks ago when it split,
a result of improper pruning by the county. The county is only
interested in ensuring clearance under street trees for trash
trucks and street sweepers, not in the health of the trees. I
never let the county near my tree.

--
David E. Ross
Climate: California Mediterranean
Sunset Zone: 21 -- interior Santa Monica Mountains with some ocean
influence (USDA 10a, very close to Sunset Zone 19)
Gardening pages at http://www.rossde.com/garden/