 Myself, Sandeep Javeri, Assistant Professor, Valtryanstok Technology, Sholapur Today, we are going to discuss Fluor Space Index, Concept, Definitions and Problem The Learning Outcome At the end of this session, students will be able to explain Fluor Space Index i.e. FSI and Compute FSI Introduction As we know, municipal authorities or any government authority which have laid down some bylaws So, one of the bylaws is Fluor Space Index and this Fluor Space Index is used to avoid the haphazard growth of cities and bring discipline in it Fluor Space Index i.e. FSI So, FSI is defined as the ratio of total built-up area to plot area Now, there are some factors which affect FSI values Type of construction So, type of construction may be residential building or it may be commercial building or it may be industrial building So, for all type of buildings, the FSI values are different Width of streets fronting the building Suppose the building is lying on a state highway road or some district road then the FSI value will be different So, width of street is very important factor Traffic load and locality and density So, building is lying in which locality and what is the traffic intensity of load at that locality and what is the density or the population of the people at that locality is also important The other factor is parking facilities and local fire hiding facilities This is very important from safety point of view also Need of FSI As we know, FSI is considered as a restriction but it has its own benefits in a city or a place where construction is progressing in huge speed It maintains the ratio of open space to built-up space It maintains the skyline of the city Average FSI value ensures a good development of the project So, as we know that in a region the urbanization is going to be fast So, this FSI requirement is necessary for that to control the haphazard growth of construction activity Here there are some FSI values 0.75 for public assembly buildings 1 for residential on smaller plots having area less than 500 square meter 1.5 for residential as well as commercial use The area is more than 500 square meter Let us consider an example A rectangular plot administers 20 meter by 30 meter The diameter side of the plot is facing the road The front and rear margin is 4.5 meter The side margin is 3 meter Now permissible FSI is 1 So, if G plus 1 building is to be constructed to consume full FSI Find built-up area on each floor So, here you can see the plot dimension is given as 30 meter by 20 meter The 20 meter side of the plot is facing the road Here this hatched portion indicates the built-up area The front margin is 4.5 meter and rear margin is 4.5 meter and the side margin is 3 meter This is the plot area As we know FSI is given by using the expression built-up area on ground floor plus built-up area on first floor divided by plot area So, let us find first built-up area on ground floor Given that front and rear margin is 4.5 meter and side margin is 3 meter So, we can obtain the built-up area available on ground which is the maximum available area So, it is to be find out by subtracting the rear margin and the side margin So, we obtain the dimension for the construction that is for built-up is 20 meter by 14 meter that is equals to 294 meter square Now, given that FSI is 1 plot area is 30 meter by 20 meter that is equal to 600 meter square So, by putting these values we can obtain what is the area on first floor So, let built-up area on first floor is X meter square Now, using the expression FSI is equal to built-up area on ground floor plus built-up area on first floor divided by 600 that is the plot area we obtain X equals to 306 meter square So, the result which we get is the built-up area on ground floor is 294 meter square and built-up area on first floor is 306 meter square Let us consider another example In a place, maximum FSI allowed is 1.4 and space of 3 meter is left all around the building Determine the width of the square plot to have optimum utilization of land for a G plus 1 building assume area on each floor is same So, here we have to find out the plot dimension So, let plot dimension is B meter square we know FSI is equal to total built-up area divided by plot area Now, built-up area on ground floor plus built-up area on first floor is nothing but total built-up area So, by using the expression FSI is equal to total built-up area divided by plot area we can obtain the expression for built-up area on ground floor as B minus 6 by B minus 6 meter square and built-up area on first floor is equal to B minus 6 by B minus 6 meter square as the area on both floor that is on ground floor and first floor is same So, plot area is given as B meter square So, you can see this is a rear margin this is a side margin that is equal that is 3 meter each and this is a plot dimension and this is a hatched portion as a built-up area Now, total built-up area will be 2 times B minus 6 the whole bracket square meter square FSI is given as 1.4 So, using this relation FSI is equal to total built-up area divided by plot area we get the expression 0.3B square minus 12B plus 36 equals to 0 So, by solving this expression we obtain the value of B as 36.73 meter and 3.26 meter But, we can't take 3.26 meter as a width of plot as we know the side margin and rear margin is 3 meter which is given So, we can take the width of plot as 36.73 meter So, the dimension of plot is 36.73 meter by 36.73 meter Now, here you have to pause the video and answer these questions these are the answers So, in first question the total plot area of construction is given as 400 meter square and built-up area is given as 200 meter square So, by using the expression FSI is equal to total built-up area divided by plot area that is 200 by 400 you are getting the FSI value as 0.4 0.5 So, 0.5 is the right answer that is option A is correct If FSI of certain plot is 1.5 that is for second question and area is 500 meter square and built-up area we have to calculate it So, for this we can use the same expression FSI is equal to built-up area divided by plot area we obtain the built-up area as 750 meter square So, option A is correct These are the references which I have used for the creation of this video Thank you