# Decision tree
On each step a decision is taken, all but one options are eventually rejected and all further decision are based on taken decision.
Independent decision that do not follow from previous ones are shown as separate branches, with their own title and branch numbers.
## Structure
1) Material
50$/m3 40Mpa pallets
+20$ 40h dismantle, +200$ 40h treatment
100$/m3 4Mpa concrete
+30$ 3h rebar/fibre, +30$ 3h mold
200$/m3 80Mpa bamboo
+200$ 40h treatment
1k$/m3 60Mpa timber
+200$ 40h treatment
200$/m3 50Mpa plastic recycled
+160h, +100k$ capital investments
500$/m3 50Mpa plastic secondary
+1000h, +5k$ capital investments
1.2k$/m3 100Mpa plastic granules
+1000h, +3k$ capital investments
4k$/m3 100Mpa aluminium
+200$ 3h paint anti rust
4k$/m3 400Mpa steel
+200$ 3h paint, +200$ 10h zinc protection
4k$/m3 500Mpa plastic fibre
4k$/m3 2Gpa fiberglass
+4k$ 20h epoxy, +100$ 5h mold, +200$ 3h paint
Decision: Steel
Reason: price, capital investments, time
2) Fasteners to join beams/slabs together
material*3 h $/m3 wedge locks
100$/m3 30h polyprop strapping
30$/m3 20h glass fiber strapping
1k$/m3 10h bolts
100$/m3 4h welding
Decision: Weld
Reason: Price, well tested, creep, time, hermetical seal
Decision: bolts
Reason: simplicity, creep, time
3) Protection (per 1m3 of main material)
10$/m3 paint, PS+toluene
100$/m3 oil derivatives
300$/m3 epoxy
4$/m3 zinc anodes
40$/m3 zinc electroplating
Decision: paint + zinc anodes
Reason: price, well tested, environment, time
4) Bouyoncy
75$/t plastic barrels
+standard
100$/t single hull
-expensive facilities -cant be done small
150$/t prestressed sphere on rebar mold 1/2
-very expetimental
150$/t prestressed sphere with rebar struct
-very expetimental, +more strength
20$/t welded steel floats
-need perfect rust protection
Decision: plastic barrels, later welded floats
Reason: quick start, price, time, work, facilities
5) Superstructure
sierpinski pyramid
+rebuild, +best strength, +price, -aesthetic
inflatable dome
+best price, +mirror/transparent, -waves
geodesic dome
+strength, +aesthetic, -price
monolithic simple shape
+build, -logistics, -repair, -worst price
flat, modules with flexible joints
+best rebuild, -waves
-storm-proof 8-12 flex joints per module
Decision: sierpinski pyramid
Reason: price, wave protection
6) Wave protection
elevated sttucture with exposed trusses
+replacable, +waves, +mobility, -aesthetics
10k$/person
structure wall
+collision protection, +mobility
30k$/person
separate fragmented truss breakwater
30k$/person, +rebuild
separate monolithic truss breakwater
100k$/person, -aesthetics
separate solid wall breakwater
1kk$/person
pneumatic active breakwater
10k$/person, 100$/person per day of storm
moonpools as absorbers
10k$/person, generate energy 10$/person/day
no wave protection
-30% population and their relatives
Decision: elevated structure
Reason: price, rebuild, mobility
Decision: separate fragmented truss breakwater
Reason: aestetics, rebuild
Decision: pneumatic + structure wall
Reason: best protection, mobility
7) Floats type
hermetically sealed deep floats
No wave reaction, no wave hits, cost x4
hermetically sealed surface floats
direct wave reaction, cost x2
deep moonpools
reverse wave reaction, no wave hits, cost x1
surface moonpools
weak direct wave reaction, cost x1
Decision: 100% deep moonpools, with dynamic control
Reason: best wave cancellation, rebuild
Decision: 90% deep floats 10% surface floats
Reason: best static stability
Decision: 33% deep moonpools and 67% surface moonpools
Reason: best price, static stability, rebuild, energy
8) Landing gear
Paw: separate upside down truss pyramids and flat bottom floaters
+can use standard barrels
Rib: united with upside down pyramids floaters
+price, +backup bouyoncy
Decision: Paw initially, then rib
Reason: same height, but rib is cheaper because no need to double structure for floating and sitting support
9) module shape, for non-flexible layer
rectangle
+0% sheeting, -20% strength, +0% usage
triangle 60*60*60*
-20% sheeting, +0% strength, -50% usage
hexagon prism
-20% sheeting, -40% strength, -20% usage
vertical cylinder
-40% sheeting, -100% strength, -30% usage
horizontal cylinder
-40% sheeting, -1000% strength, -40% usage
Decision: rectangle
Reason: best usage(for rectangle items) per strength and cost
10) floaters shape with nose and tail, side cx
rectangle
+0% sheeting, -50% strength, cx=1.4
triangle 60*60*60*
-20% sheeting, -50% strength, cx=1
hexagon prism
-20% sheeting, -50% strength, cx=1
vertical cylinder
-40% sheeting, +0% strength, cx=0.8
horizontal cylinder
-40% sheeting, -30% strength, cx=0.3
Decision: horizontal cylinder
Reason: best cx(drag) for given strength and cost
11) anchors
big chunk of concrete
30$/t, x1 weight to holding force, 10$/drop
steel anchor
100$/t, x4 weight to holding force, 10$/drop
piles
10$/t, x40 weight to holding force, 100$/drop
suction caissons
30$/t, x20 weight to holding force, 30$/drop
Decision: suction caissons
Reason: pile hammering is too expensive and prohibited in populated areas, concrete needs too heavy machinery and anchor is too expensive and also needs too much machinery
12) angle sensors
pipe with fluid
-wave interaction causes bad readings
accelerometer
-a bit more expensive
Decision: accelerometer
Reason: increase in price is way smaller than saved cost of risk of bad reading from mechanical sources of angle data
## Infrastructure
1) Potable water, capital investments(>3m3/mo)
30$ 3kj/kg reverse osmosis
+100kj/kg price equivalent for filters
+10kj/kg when rain water is used
1k$ 400kj/kg membrane distillation
1k$ 100kj/kg water compression evaporator
+gives almost free waste disposal
10k$ atmospheric water net condenser
1k$ 0.1kj/kg wedge wire screen
1kt per day, 75 micron solids, 30k people
30$ rain collection
50sqm per person, roof already exists
1k$ 400j/kg acid/base + ionexchange buffer
Decision: Rain collection and osmosis
Reason: they compensate each other minuses, both are well tested
2) Energy
Sun
10$ 1w/$ PV
100$ 0.1w/$ 10wHeat/$ evacuated tubes
1k$ 3w/$ 10wHeat/$ PV + mirrors + cooling
1k$ 0.3w/$ 3wHeat/$ through+mirrors+turbine
10k$ 0.1w/$ 3wHeat/$ algae grown for fuel
100k$ 1w/$ 3wHeat/$ tower+mirrors+turbine
Wind
1k$ 0.3w/$ vertical axis windmill
1k$ 0.1w/$ drag-based vertical axis windmill
1k$ 1w/$ classical windmill
10k$ 3w/$ flying windmill
Waves
1k$ 0.3w/$ pneumatic, moonpool + turbine
1k$ 0.3w/$ mechanical, bending joint
Decision: PV, classical windmill, pneumatic
Reason: well tested, diversity, capital cost
3) Roads
1-10% of modules fully designated as roads
1-10% of surface of every module for roads
Decision: designated modules
Reason: more flexibility, same cost
4) Electrical network short range (under 1 km)
220v 50hz
99% compatibility, generator cost x3
when used on a large scale - has to be done
in 3 phases to avoid damage to the generator
110v 0hz
3% compatibility, generator cost x1
cheap network joining/balancing
much safer than 220v but still not fully safe
invertors cost x2, wires cost x2
220v 0hz
80% compatibility, generator cost x1
cheap network joining/balancing
220v 400hz
10% compatibility, generator cost x2
needs minimal shielding of a wire from iron
220v 2khz
10% compatibility, generator cost x1
needs heavy shielding of a wire from iron
1kv 2khz
0.1% compatibility, generator cost x1
wire cost x0.2, death risk, needs shielding
1kv 0hz
0.1% compatibility, generator cost x1
wire cost x0.2, death risk, cheap balancing
12v 0hz
wires cost x20, 10% compatibility
generator cost x1, invertors cost x20
2.4 ghz
waveguides cost x10, 0% compatibility
rectifier x3, voltage converter x1
complex coupling, expensive vacuum/glass
high loss on every stage
Decision: 220v 0hz
Reason: 0hz: low health risk, cheap network joining, reasonable compatibility, cheap generators, cheap invertors, no need for multiphase.
5) Electrical network long range (1 km+)
220v 50hz
99% compatibility, generator cost x3
220v 0hz
80% compatibility, generator cost x1
cheap network joining/balancing
220v 400hz
10% compatibility, generator cost x2
needs minimal shielding of a wire from iron
220v 2khz
10% compatibility, generator cost x1
needs heavy shielding of a wire from iron
1kv 2khz
0.1% compatibility, generator cost x1
wire cost x0.2, death risk, needs shielding
1kv 0hz
0.1% compatibility, generator cost x1
wire cost x0.2, death risk, cheap balancing
5kv 0hz
10% compatibility, generator cost x1
wire cost x0.04, death risk, cheap balancing
can power microvaves, lamps, lasers directly
12v 0hz
wires cost x20, 10% compatibility
generator cost x1, invertors cost x20
Decision: 5kv 0hz
Reason: cheap network joining, cheap generators, cheap invertors, cheap cables, moderate protection needed
6) electrical meeter
clamp based resistive meeter
+cheap, -temp sensetive, costly install
hall based current meeter
+cheap install, +more precise
old style disk meeter
-expensive, +most precise
Decidion: hall sensor
Reason: total cost of install+device is lower. average precision is enough
7) firefighting techniques
electrical fuse
electronical power disconnect
water spray from utility water
water spray from separate system
Decision: water spray from utility water + electrical fuse
Reason: cheaper, comparable protection
## Social
1) Scarcity problem
free trade with no restriction
-risk of hunger deaths and respect damage
obliged life support minimum + free trade
-minimum damage to the economy
fully planned economy
-significant damage to the economy
Decision: life support minimum + free trade
Reason: balance of damage to the economy and respect
2) population growth balance
free growth with no restriction
-may result in catastrophic collapse
free growth + restrictions by life support
-minimal damage to the economy
fully planned growth
-will damage economy
polls, asking if growth is to be allowed
-will lead to government
Decision: free growth + life support
Reason: balance of risk of catastrophe and economical growth
3) population estimate/counting
optional cameras installed + payments for data
-some people dislike cameras
mandatoty chip injection on arrival
-a lot of people are against of
forced medical procedures
mandatory passport registration on arrival
-least effective +people are used to it
Decision:
Reason:
4) life support utilities minimum
force reduce power to 12v to 0.1A
-useless for most stuff
-expensive and inefficient invertors
-needs expensive batteries
force switch off after 10kwh/month
-large losses for unexpected cut off
give audio signal after 10kwh/month
-some loss for overusage
Decision: audio signal after 10kwh/m
Reason: loss from overusage is negligible compared to loss of broken devices and loss of data