Well .....He’s not going to build that wall you pictured and he was smart enough to figure out why YOUR wall simply cannot happen...so Here’s some facts on why......
Only ‘one’ wall ‘in History’ has been built even remotely as the one you have pictured....it was built through land about the 2,000-mile-long as our southern border.... ....andd it was accomplished only through a ‘centuries-long’ building campaign that necessitated the forced labor of millions of Chinese peasants.
To take on a wall as you imagine and showed.... it would be one of the largest civil works projects in the history of the country and would face enormous if not impossible challenges....
Your wall would need to reach about five feet underground to deter tunneling, and would need to rise to about 20 feet above grade to deter climbing.
Because you mentioned concrete you need to consider the following:
There are two major types of concrete construction:
...cast-in-place, where wet, plastic concrete is ‘brought in trucks’ to a job site, cast into formwork, and then cured
...pre-cast concrete, where the concrete is cast in a controlled indoor environment, cured, and then ‘shipped to the construction site for assembly’.
The hot, dry climate in the border regions would complicate cast-in-place construction because high heat tends to screw up the chemical reactions that cause concrete to harden. So it would have to be pre-cast.
If we assume a border wall length of 1,954 miles (there are 600 or so miles of existing border barrier, but much of this would not qualify for the wall), then we can make some estimates as to the volume of concrete needed for the project:
Foundation: .......6 feet deep, 18 inch radius = 42.4 cubic feet
Column:............. 4 square feet area by 30 feet tall = 120 cubic feet
Wall panels:..... 25 feet tall by 10 feet long by 8 inches thick = 166.7 cubic feet
....Total concrete per 10-foot segment = 329.1 cubic feet
1,954 miles = 10,300,00 feet = 1,030,000 segments (10-feet long each)
1,030,000 segments * 329.1 cubic feet per segment = 339,000,000 cubic feet = 12,555,000 cubic yards. (The cubic yard is the standard unit of measure of concrete volume in the United States.)
So 12 million, six hundred thousand cubic yards!!.....In other words, this wall would contain over 3 times the amount of concrete used to build the Hoover Dam — that’s ‘THREE TMES’
Concrete, of course, requires reinforcing steel (or rebar)......So a reasonable estimate for the amount of rebar would be about 3 percent of the total wall size, resulting in a steel volume of 10,190,000 cubic feet, .....or about 5 BILLION pounds. ......
All of these hundreds of miles of wall would need to be cast in concrete facilities, probably project-specific ones that have been custom built near the border. Then, the pre-cast wall pieces would need to be shipped by truck.
The men and women doing the work of actually installing the wall would have to be provided with food, water, shelter, lavatory facilities, safety equipment, transportation, and medical care, and would sometimes be miles away from a population center of any size.
Added to this of course because it’s a large scale engineering projects:
surveying,... land acquisition, ...environmental review, ...geological studies,... maintenance,... excavating for foundations, and so on. ..
Not to mention the costs of a host of lawsuits that will assuredly impede this kind of work
What was in the beginning a 2,000 mile wall Trump has cahnged to a 1,000 miles since he met with those who know about these things....natural barriers etc. so be sure not to hold him to that initial miles.