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I am working as Urban Planner in developing City bus plan for Kabul city in Afghanistan, which includes both operational plan as well as a plan for necessary infrastructure (e.g. stations, terminals, depots, etc.).
I tried to search a specific standard for developing a land use plan for all these stations, but could not find any.
Can someone please recommend me a specific manual/ standard which could help me in identifying percent of green area, built-up area and paved area (for bus maneuver and parking).
I'm glad you're searching for site plan ratios that relate to building design categories occupied by specific activity groups. These ratios define the shelter capacity, intensity, intrusion, and dominance introduced. They also determine the amount of land we remove from our source of life. I'm not aware of research that has collected or related these statistics to the physical, social, psychological, environmental, and economic quality of life created. I think this is what you're looking for and you might ask for completed project site plans to measure. A visit these projects may be unrealistic from your location and evaluation may be limited to requested photographs. I'd like to suggest that these standard measurements include at least the following as both area and percentage quantity measurements:
1) Building Cover (Footprint)
2) Open Space (Private Unpaved Area for Social Activity)
3) Open Space (Shared (Common) Unpaved Area for Social Activity)
4) Pavement for Social Activities
5) Pavement for Miscellaneous Pedestrian Activity
6) Pavement for Service Activities (Parking, Loading, and Driveway Circulation)
7) Floor Quantity (ignore percentage measurement)
8) Floor Quantity Average for Variations (ignore percentage measurement)
If you're looking for pattern language suggestions, you might consult the Institute of Traffic Engineers (ITE) and Architectural Graphic Standards. I doubt that they will give you any guidance on unpaved open space quantities since this has never been a priority and is often sacrificed to make a project "fit" the site. The Institute used to have a great binder of clear plastic overlays at various scales for turning movements related to various car and truck sizes. They may still have them. Good luck