In this setting, international treaties restrict the yield of legally usable nuclear weapons to under the equivalent of 1,000 metric tons of TNT (one kiloton). If an entity detonates nuclear warheads of a higher yield, it is subject to annihilation via every other geopolitical entity's strategic-level nuclear weapons. In other words, the use of nuclear weapons with a yield of more than 1 kiloton is illegal unless they're being used on an entity who launched such weapons first.
As such, warfare in this setting involves lots of small nuclear detonations. For instance:
Why do your tanks need to make direct hits the enemy's tanks when they can instead shoot near them with a 72-ton-TNT-yield nuclear artillery shell? NUKEMAP says an explosion of that magnitude would be enough to destroy a tank within 90 meters/295 feet of the epicenter of the detonation, assuming that 20 PSI of overpressure can destroy a tank - which I'm quite sure it can, considering that half that can "severely damage reinforced concrete buildings".
Why put advanced, expensive guidance and aiming systems onboard your air-to-air missiles when you can throw an unguided nuclear air-to-air rocket at your opponent instead?
"To hell with the fallout! To hell with the environment!", these people think. "We have a war to win."
Within a certain time period in this setting, some cities are getting constantly pasted with nuclear weapons. They're pretty small nuclear weapons, to be sure; assume that each of them has a yield equivalent to 10 tons of TNT - think the Special Atomic Demolition Munition's lowest yield. However, this makes them easy to mass-produce and launch, and, for the purposes of this question, let's assume that every 15 square kilometers of a city get hit with one such nuclear weapon per day, and that every city/town smaller than 30 square kilometers gets hit with one such nuclear weapon per day.
Keep in mind that, according - again - to NUKEMAP, a ten-ton surface burst results in effects such as:
A 20-meter-across fireball, in which everything is annihilated and kicked up as fallout.
20 PSI of overpressure at 50 meters from the epicenter of the detonation - enough to destroy heavily-built concrete buildings.
5 PSI of overpressure at 100 meters from the epicenter of the detonation - enough to kill people by crushing their alveoli, if I recall correctly.
1,000,000 rem of ionizing radiation at 20 meters from the epicenter of the detonation, assuming that nothing blocks it; I don't know what this'll do to a human, but I assume that it'll turn them into a puddle, if the 200 PSI of overpressure doesn't do it first.
10,000 rem of ionizing radiation at 150 meters from the epicenter of the detonation, assuming that nothing blocks it; I also don't know what this'll do to a human, but I assume that it'll turn them into a puddle in a somewhat slower fashion, considering that Hisashi Ouchi (look him up at your own risk) was hit with about 17% of it and still died horrifically.
100 rem of ionizing radiation at 570 meters from the epicenter of the detonation, assuming that nothing blocks it; results in mild radiation sickness, vomiting, diarrhea, fatigue, etc.
1 rem of ionizing radiation at 1,350 meters from the epicenter of the detonation, assuming that nothing blocks it; this is 80% of what's allowed for a nuclear worker during a calendar quarter, according to OSHA.
Some radius at which the heat is enough to set materials such as dried wood on fire - note that NUKEMAP doesn't do this for low enough yields
Some level of fallout, which, again, NUKEMAP won't display, since this detonation is 100 times smaller than the minimum it'll spit out a fallout cloud estimate for.
This is pretty bad.
However, you can't just bury everyone in a bunker. There are issues with that - too many to list here, but primarily related to things such as supply constraints and mental health. Assume that making a city solely out of bunkers is not an option for this question. Moreover, assume that you can't just leave.
With that out of the way, the question: in terms of urban design, how do you design a city to be habitable/livable as possible under a daily rain of 10-ton nuclear warheads?
Assume that we're using modern technology, and that this is on Earth - i.e. oxygen-nitrogen atmosphere, carbon-based life, et cetera.