To answer your inquiry Dr. In my opinion, it is not possible to determine the appropriate proportion of the housing area or green areas in absolute terms when updating the master plan of cities because it depends on the amount of available area of the city for future expansion and that the determination of the area allocated for housing depends on many other factors but in general can be between 40% 60% of the area allocated, either green areas, the upper limit does not exceed 12%, Thank you for your attention
When thinking water systems, percentages of different land use areas are not so important. The watershed is very important and how well the water system is able to manage rains and dry seasons.
When thinking aquatic life, there is a very good, old article: Thomas R. Schueler.:"The Importance of Imperviousness" - Feature article from Watershed Protection Techniques. 1(3): 100-111. I found the modell very good in Finland, but I do not know, if you may apply the research in other climate zones.
There is also another, good article about aquatic life:
Thomas R. Schueler; Lisa Fraley-McNeal; and Karen Cappiella:
"Is Impervious Cover Still Important?" in Journal of Hydrologic Engineering/ Volume 14 Issue 4 - April 2009
There is no fixed ratio for each city, but the criteria for land use are determined according to the studies accompanying the preparation of the master plan, to suit the cultural and economic considerations and preserve the environment
The problem is multidimensional. So the answer depends on what is your objective. However, the percentage has an influence on the quality of environment. I have a narrow point of view and for me the green fingers or linkage are inportant in masterplan. It is very difficult to create them later.
Dear Dr Haider,
I agree with your idea that the ratio depends on the amount of available area of the city for future expansion, What about the factors which effect on determine this ratio??
regards
Haider Majid Hasan
Dear Ulla,
Thanks for your advice.
Actually, I agree with you that the problem is multidimensional, but I am wondering in general
What is the suitable ratio of land use(housing, green area, etc??
regards
ulla-maija Rimpiläinen
Dear Dr Ihsan,
Well done, This is exactly what I mean, the criteria for land use are determined according to the studies accompanying the preparation of the master plan . so that in your opinion how we can do that in our city?
regards
Ihsan Jasim
47% building and 53% green land
Divided by division on each region and the composition of this region
Dear Lobna,
Than you for your advice
regards
Lobna Mahmoud Moubarak
As I said before I know only the situation in quite cold climate. There 30% of impervious cover on each watershed is critical (according to Dr Schueler in U.S.). Howevere, you may improve the situation using geen roofs. That is a sustainable system.
Dear ulla-maija Rimpiläinen ,
Thank you for your scientific notice.I agree with you that the situation in quite cold climate.
regards
ulla-maija Rimpiläinen a-maija Rimpiläinen
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