iA


Benefits of the Grid

by Paul Knight. Average Reading Time: about 5 minutes.

During the Great American Grid Debate at CNU 21, Kevin Klinkenberg and I sparred valiantly together to defend the grid’s honor against our arch-nemeses Howard Blackson and Bill Dennis. Dozens of spectators observed us as if we were gladiators battling to the death. In the end no one died, but we bickered as if our lives depended on it.
I have organized some of my main arguments from the debate into a simple list describing the benefits of the grid. Why should one use the rectilinear grid today? Here are some points to keep in mind.

1. Walkable

With the proper block size, the grid is inherently walkable. Proper block size is the key term here. Blocks with sides less than about 600 feet and perimeters less than 1,800 feet agglomerate together to form a connected network that behooves everyone whether traveling by foot, car, segway, or stroller. By its very geometry, the grid provides the connectivity necessary for good urbanism.

DSC_9807

2. Navigable

Never ask for directions again. The grid gives you an immediate sense of where you are in the world: left-right, east-west, uptown-downtown. As a bonus, it also gives you a sense of distance. As long as you know the unit of measure between intersections, the grid behaves like a giant yard stick.

For example, say you wanted to travel from 200 Street to 800 Street in Salt Lake City. Here is a series of quick calculations you can easily handle in your head before you decide whether or not to spend money on a cab:

  1. 800 Street minus 200 Street equals 6 blocks
  2. Each block is 660 feet on a side with 132′ rights-of-way, making the intersection-to-intersection distance 792 feet (about 800 feet)
  3. 800 feet times 6 blocks equals 4,800 feet, or a little less than a mile
  4. The average pedestrian walks at a rate of 4.9 feet per second (or about 300 feet per minute)
  5. 4,800 feet divided by 300 feet per minute is 16 minutes

So not only do you know where you are in the world, you know how far you have to walk and how long it’s going to take you to get to wherever you are going.

3. Adaptable

Land uses change constantly. With rectilinear lots and blocks, old land uses can move out and new land uses can simply plug in.
Take Manhattan, for example. The block at 71st Street and Madison Avenue once accommodated Lenox farm (photo below from the MCNY). Fast forward almost 200 years and that exact same block today accommodates high-rise apartments, office buildings, and art galleries.

DSC_9840

Not every block can do this. The next point explains why…

4. Orthogonal

While I may have never met you, dear reader, I am rather confident that I know a lot about you. I bet the screen on which you are reading this sentence is rectangular, I bet the desk the screen is sitting on is rectangular, I bet the room the desk is sitting in is rectangular, and I bet the building the room is sitting in is rectangular. Like it or not, you are surrounded by 90-degree angles: books, boxes, beds, benches, barns, bricks, and blocks.
This may seem like an odd point to make, but the fact of the matter is rectangular blocks accommodate the rectangular objects of our lives extremely well. The Commissioners of New York in 1811 recognized this when they chose the grid for Manhattan:

the right sided and right-angled houses are the most cheap to build and most convenient to live in.

The same holds true for skyscrapers as well.

manhattanblock

Orthogonal blocks allow objects and land uses to trade places with ease and efficiency. These geometric efficiencies compound upon each other as you move up in scale: rectangular desks beget rectangular rooms beget rectangular buildings beget rectangular blocks. This leads to the next point…

5. Economical

A rectangular block allows you to do the most with the least. The exact same block in Manhattan has accommodated everything from a farmhouse to a skyscraper. The exact same piece of dirt—now that’s economical!

6. Sustainable

A rectangular block allows you to do the most with the least. The exact same block in Manhattan has accommodated everything from a farmhouse to a skyscraper. The exact same piece of dirt—now that’s sustainable!

7. Appendable

With the grid, the method for expansion is obvious; new developments know exactly what form to take. Since the block is the fundamental unit of the grid, new blocks can append to old in a logical sequence that can theoretically guide development forever.

great falls mt 1891

8. Historical

The grid is a fundamental part of our American heritage. While the grid has been utilized around the world for thousands of years, William Penn introduced it to America in 1682 via Philadelphia. Since then, the grid has made its way across our vast country thanks predominantly to Thomas Jefferson’s 1785 Land Ordinance. Countless others, from greedy developers to Mormon settlers, have followed suit. By utilizing the grid, today’s city planners and urban designers can continue this long lineage of linearity.

philadelphiamap2

In Conclusion…

Simply put, the grid works; it is a two-dimensional organizing framework for urbanism. By using the grid, all of the benefits above are built right into your plan; your urbanism will be off to a great start. Zoning and economy together are responsible for the three-dimensional form that materializes on top of the grid. This is where things can really go right or wrong. The grid, just like any other form of urbanism, is subject to the successes and failures of urban design, architecture, and all the other considerations that make up our built environment. If you are unhappy with your town, blame your zoning ordinance not the grid.

Do not succumb to the knee-jerk reaction that grids are boring. Instead, take a deep breath, go to Google Earth, and drop the Google-Street-View-Man onto a grid. You will find a variety of places (good, bad, and great) all predicated upon the exact same city plan. The grid can be as wonderful or as terrible as you decide to make it. All I am saying is give grids a chance.

8 comments on ‘Benefits of the Grid’

  1. Paul Knight says:

    Kevin Klinkenberg has also written a follow-up on the Great Debate at his blog: http://newurbanismblog.com/great-american-grid-debate/

  2. Steve Mouzon says:

    Thanks for putting this up, Paul! And thanks for doing the session the way you did… it was the most entertaining session I think I’ve ever seen at CNU! If you hear of anyone else posting on the subject, please let me know and I’ll put it up on the Street Network BlogOff page:
    http://www.urbanismblogoffs.com/blogoffs/street-network-blogoff.html
    And I’ll have this one up shortly.

    • Paul Knight says:

      You can thank Kevin Klinkenberg for organizing the debate format. Bill, Howard, Lee, and I were fumbling up there. Kevin, on the other hand, had years of high school debate experience from which to draw.

  3. P T Briody says:

    Thank you, this was a very clear and interesting piece. You may mention this elsewhere on your website, but one thing I would add to what you’ve written is how the repetition of the grid can be interrupted periodically with great results. This can happen organically as previously independent grids with different orientations grow and interface with each other. Manhattan’s lower east side is about 30 degrees “out” from midtown, with the result of having some surprising, and interesting intersections. It’s also true that the repeating pattern can have a planned interruption such as a plaza or roundabout. Kind of acts like the surprise bridge in a great, compelling rock song.

  4. […] Nation] Gateway may mean 1-seat trip to NYC [THR] City’s Boom Spurs a Need for Housing [WSJ] Benefits of the Grid [The Great American Grid] River of Industry [Architects Newspaper] Abandonment, Authenticity, and […]

  5. I gotta favorite this site it seems handy very helpful.

Leave a Reply