Most plans made to deal with the aftereffects of a natural disaster are a joke.
Agreed. In fairness, I've read numerous admissions by emergency planners that evacuations are unworkable. Consider the chaos of hurricane evacuations, with days advance notice and undamaged routes. The angry congestion and vehicle breakdowns become major obstacles. Hell, I've been frustrated driving big truck in construction zones, where "Merge Left" signs are arrayed for three miles prior. All that does is cause most drivers to race ahead, ignoring the inevitable, and arriving at the choke point and traffic jam caused by everyone attempting to crowd in at the last minute.
Even a rolling blockade by big trucks, attempting to force people to merge and enable the traffic flow to continue, is resented and has even resulted in control-freak State Police ticketing the big trucks for "obstructing." I once had an SUV pass my truck on the right, barreling at 50 mph down the grass strip beside the breakdown lane that I was covering as part of the "force merge" tactic. He skidded, weaved violently, and almost rolled before he regained control and sped to the choke point a mile ahead, and was forced to a dead stop. Moral of the story: any orderly evacuation attempt will be defeated by such angry and disorderly idiots.
During the recent Cascadia Rising exercise, it was reported that some of the participants got pretty hot with each other. Example: the WSDOT emergency center was asked their estimate to clear a "major landslide" that had blocked I-5.
"Three days at the soonest," they answered.
"What? How the hell are our emergency crews going to get to the disaster area? Can't you people move faster than that?"
The screaming match began, and this was only an exercise of "what if" scenarios.
I've experienced a 7.3 earthquake. My two-story log home and our village was close to the epicenter. It was violent, roaring, and frightening. It killed some people, and raised Idaho's highest mountain by another fifty feet! But worse that that... were the successive aftershocks, one following another, and each of them a major earthquake in its own right. One finds oneself enraged and swearing uncontrollably after a time, as they keep coming. I would not care to be attempting to secure damaged bridges, or going into damaged buildings for survivors, or be setting up aid stations in areas already weakened by the main quake. A 6.0 or 5.5 aftershock can wreak bloody hell in an already devastated and vulnerable situation. Responder training is very effective. Don't become a needless victim.
Realizing that disaster plans are mostly a placebo, that resources are extremely limited and dispersed, the only effective solution is to plan ahead, stockpile, make plans with neighbors for mutual support, and keep one's water, fuel, and food reserves recycled and restocked. Plan on living without sewage, water, and electric utilities.
One last interesting point: thanks to the American "squick" factor involving nasty poo, no plan I've seen ever addresses what families need to do about bodily waste. The closest I've seen is "fill the bathtub for flush water." Oh... call for a porta-potti to be delivered? Right-o! Sewage lines and treatment plants will be knocked out along with water mains and power lines.
Here's a tip (really useful for your next Apocalypse scenario. This is practical. Cruising boats are coming to use this method (albeit a bit shinier and much more expensive): a five-gallon pail, a plastic trash bag liner, a cheap toilet seat, and a big bag of peat moss or sawdust pellets or even shredded newsprint. Put a couple handfuls in the bottom; poo and cover lightly. Repeat as needed. This will last two people for a few weeks. Do NOT pee in the bucket It's too much liquid. Pee is essentially harmless. Dispose of it outside. When the poo bag compost mix is full, find a dedicated place to put it, preferably a place where natural soil breakdown can occur. Start a new bag in the bucket. Problem solved. No big sanitation or disease situation.
Oh, that boat thing? There's one called "AirHead" and it costs a thousand bucks. Basically the same approach as a bucket and a plastic garbage bag with peat moss.