Juan Mazzini
James Connolly
ORF 467
City Assignment
The zone reference numbers, land uses, areas, and centroids are included in the
excel spreadsheet. As for the assumptions we made—
1. We assumed a population age structure similar to that of the US, with about 8% of
the population in each of the 5-year age brackets from 0-4 to 46-50. After that, we
slotted the remaining 20% under 50+, with 10% retired. In our city, 24% of the
population goes to elementary, middle, and high schools. Half of the 20-24
population (4% overall) goes to university.
2. We divided the 250,000 citizens into wealthy (65,000), middle class (150,000),
and poor (35,000). The rich live in low density housing, middle class in medium
density housing, and the poor in high density housing.
3. We assumed that 50% of the population between 20-24 went to university, giving
10,000 students and a density of about 6700/square mile. For high density, we
placed 75,000 people in 2.2 square miles giving a density of about 32,000/square
mile. This population lives in high-rise apartment buildings that maximize space per
square mile usage. For medium density, our population included 135,000 people
within 9.8 square miles giving a density of 13,800 per square mile. Finally, lowdensity housing includes 35,000 people over 7.0 square miles giving a density of
about 5,000 per square mile. 10,000 students “live” at the university and don’t
commute, and are not included in daily trips.
4. For school enrollment outside of university, our city has 60,000 people between
the ages of 5 and 20. We divided up the schools into elementary, middle, and high,
with 20,000 attending each. Total square mileage for each school is 1.6, 1.6, and 1.5
square miles, giving an average density of 12,500 students/square mile. The average
density may sound high but after a bit of research a school fit 950 students into .004
square miles (140,000 square feet), giving a density of 190,000 per square mile
(although this is on the tail end of densities). Our densities leave some space in a
realistic school-campus setting.
5. Employment-wise, our assumptions included:
-uniform staff-student ratio of 10:1 across all of the elementary, middle, and high
schools
- university- a staff 5:1 ratio.
-8% of the population is between the ages of 0 and 5 and does not attend school or
work
-24% of the population is between the ages of 5 and 20 and attends elementary
(8%), middle (8%), and high school (8%)
-half of the 20-24 population attends college (4%) and the rest (4%) work
-10% of the population is retired
-thus the total population eligible for work is 54%
-we took unemployment to be around 10% for simplicity, so total workers include
48% of the commuting population, or 115,200 (48% of 240,000, leaving out the
students that live on the university campus).
6. Employment Statistics’ assumptions
-Parks- 28 workers/ park for maintenance, security and snack shop.
-Library/ theatre/ dance-hall- Between librarians, crew members, dancers,
maintenance, coffee shops, etc, we estimated approximately 200 workers.
-Golf Course/ Rec Center- Between pro-shop workers, caddies, course-rangers,
facility managers, etc., we estimated around 200 people at this facility.
-Farms- We estimated around 140 workers/ sq. mile. This takes care of the farmers,
managers, distributors, etc.
-Schools- 10:1 student to teacher ratio yields these numbers.
-Courthouse/Jail/ Town-center- Between judges, police officers, town officials,
guards, 900 people seemed reasonable (Assumes 1600 ft2 per person)
-Health Center- Assumed
- Commercial:
-Light (One- Floor Restaurants, Retail), Assumes 16000 ft2/ person –
mostly people shopping/ eating, storage space.
-Medium (One or Two FloorRestaurants, Retail, Offices) Assumes 18000
ft2/person- mostly people shopping/ eating, storage space.
-High (Multiple-Floor Offices) – Assumes 8000 ft2/ person (empty halls,
meeting rooms, cafeterias, etc., but cramped boxes for working).
-same as Financial District
-Industrial:
-Light- Assumed 15000 ft2/person- mostly machinery. People mostly doing
managing/ some maintenance
-High- Assumed 16000 ft2/person- More machinery, but managing jobs
remain at about the same density.
-Power plant- Assumed 22000 ft2/ person- A lot of generators/ open space.
7. Patrons
-CommercialLight & Medium- Assumed a ratio of 5:1 of visits/ worker.
-Golf Course/ Rec Center- Assumed 300 golfers and 700 people to the rec center
(assume teams of 20 and around 35 teams practicing a day)
-Health Center- Assume .5% of population is sick on any given day.
-Stadium- Only opens one day, so divide total/7. On game-day, assume 35,000 (a
little over 10% of population goes to the game). Therefore, 5,000 average per day.
-Park- Assume 1000 people/ sq mile per day. This seems logical since during
weekend more people are probably there, but during the week, use is limited
predominately to sport teams.
-Library/ Theatre/ Dance Hall- Between students and citizens going to the library,
and the people going to shows, 6000 patrons seemed like a reasonable estimate of
the daily traffic (2-3% of population).