Graphics Programs Reference
In-Depth Information
8.
To create the Madison Lane alignment, repeat steps 3 through 7,
entering
Madison Lane
for Name and using circles F through H.
9.
To create the Logan Court alignment, repeat steps 3 through 7,
entering
Logan Court
for Name and drawing it from circle I perpen-
dicular to the Madison Lane alignment.
10.
Save and close the drawing.
You can view the results of successfully completing this exercise by opening
Alignment Creation Tools - Complete.dwg
.
using temporary Geometry
Existing physical and legal boundary features almost always influence the layout
of any land-development design. In a residential project such as the example in
this topic, the goal is to create as many optimally sized lots as possible within
the available area. Every lot must also be accessible from roads built through the
site. With these things in mind, along with the geometry of the existing property
boundaries, terrain, and other constraints, it's frequently helpful to create some
temporary geometry to guide you in the creation of the alignments.
In the drawing for this exercise, the blue linework is provided for you and represents
geometry that references existing features of the site. Dimensions and notes have
also been provided to help explain the reasoning behind this geometry. The fol-
lowing list represents key considerations when creating this temporary geometry:
▶
150' (45m) offset from the road centerline to the backs of the lots to accom-
modate a 50' (15m) right-of-way, an adequate front yard, a single-family
residence, and an adequate rear yard.
▶
Perpendicular intersection with the existing road that is ideal for safety
and accessibility.
▶
Avoidance of the steep area to the south.
▶
Uniform geometric properties where possible, such as 90
°
angles, parallel
lines, and so on. This is recommended for simpler, more efficient stake-
out and construction.
▶
Avoidance of the farmhouse and buildings, because that part of the
property will be deeded back to the original owner.
In the real world, you'll need to come up with this temporary geometry on your own.
In fact, this is what design is all about: using your knowledge and creativity to come
up with a technical solution to a need or problem. Creating the alignment is the easy
part. Coming up with the temporary geometry as described here is the real challenge.
