This gives a professional's definition of "daylighting" pertaining to architecture. How the definition relates to turning part of Carrall Street into a canal I do not understand.
http://www.betterbricks.com/
Daylighting 101
by Joel Loveland and the New Buildings Institute
The following information presents a quick overview of the basics of daylighting design. It is not intended to cover all the design issues, but instead to highlight some of the key ones.
A good daylighting design
What do we mean by daylight? Inside a building, daylight performs the same way as diffuse light from the overcast sky. Good daylight is soft and cool, both in temperature and color. If a building owner or an architect sets daylighting as a design goal, the building will admit this diffuse light, proportioned to the needs of the people in its spaces.
Diffuse Daylight not sunlight
Sunlight -- the direct rays of the sun -- may be welcome on a day at beach, but not inside offices and classrooms. Architects want to avoid generously opening a building to the sky in ways that give access to the sun's direct rays. Glare and overheating from the sun's rays are debilitating in areas where workers perform critical visual tasks. In offices, and classrooms, direct rays seriously distract from the work at hand.
Instead, architects seek to maximize the penetration of diffuse light and block the direct sunlight. The U.S. Green Building Council's
LEED™ standard requires that no direct sunlight be admitted to critical task areas in order to be considered as daylit.
The many different climates of the Northwest produce a wide diversity of sky conditions and therefore daylighting design challenges. Every area of the region has great potential for using daylight. Even the dark and gray overcast of the coastal Cascadian region of the Northwest offers abundant diffuse light, an ideal condition for daylighting design.
Daylight varies by season and time of day During the day, daylight changes in both direction and intensity. A good daylighting design is one where the patterns of light and the patterns of work follow the movement of light in the sky. A building that uses daylight effectively also accounts for changes in seasonal cycles.