 Myself Sachin Deshmukh, working as an assistant professor in the Department of Civil Engineering of Vyalchand Institute of Technology, Swalapur. Today we are going to see and learn what is the Sepulity wear and how we can find out the discharge over this Sepulity wear. These are some photographs of Sepulity wear. According to this particular photograph, you will come to know this is a trapeze hurdle wear. Yes, this trapeze hurdle wear is called as a Sepulity wear. This is a sloping side, this is a horizontal bottom and again this is a sloping side. This is constructed in a channel. Here water is flowing over in the another photograph you can see. Water is flowing over this Sepulity wear and this top line it is called as a crest. What is the Sepulity wear? It is a particular type of trapeze hurdle wear or we can say it is a combination of a rectangular wear as well as triangular wear. See here if you can take this line vertical line this vertical line it becomes a rectangular and this sloping portion and this vertical line in between this triangular portion 1 and triangular portion 2 these are the triangular wear. So it is a combination of rectangular as well as triangular. Again we can say it is a particular type of trapeze hurdle wear where the sloping sides of which has an inclination of one horizontal to four vertical and this wear was invented by an Italian engineer Sepulity in 1887. As I told it is a combination of rectangular as well as triangular the discharge of rectangular and triangular is combined. The discharge over a rectangular wear it is 2 by 3 cd under root 2g lh raise to 3 by 2 where cd is coefficient of discharge l is length of the channel h is head and for triangular it is 8 by 15 cd under root 2g tan theta by 2 h raise to 5 by 2. Here length is not there that is length of the wear is not there here only angle is there so tan theta by 2 h raise to 5 by 2 particularly one thing comes in our mind what is a notch and wear actually notch is a thin plate and which is located or constructed in the channel. Either and rather we can say wear is in a big scale which we can construct in the canal sections big sections where we can find out the discharge through that canals and we have seen some notches in our laboratory to where we can find out the discharge in the given section of that particular small channels. Now see here the total discharge it is a combination of rectangular as well as triangular where cd 1 and cd 2 respectively these are the coefficient of discharges for rectangular as well as triangular. The purpose of slope obtained on side is to obtain and increase discharge through the triangular portion of the wear which otherwise would have been decreased due to the end contractions in the case of rectangular wear. See here the statement is for this one due to the sloping side the decrease in the discharge due to the end contraction is compensated by this triangular portion this and this triangular portion. So as in the case of trapezoidal wear here the superiority wear is also the discharge we can calculate as q 1 and q 2 that is rectangular as well as triangular this is with the end contraction this is the formula with the end contraction and with the triangular notch and from this if you can equate this you will get and theta by 2 is 1 by 4 put this value you will get this equation thus adding these two the discharge for the superiority wear is given by q is equal to 2 by 3 cd under root 2g l 0.2 h hs to 3 by 2 plus 2 by 15 when you are going to add 10 theta by 2 is 1 by 4 sloping side you will get 2 by 15 cd under root 2g hs to 5 by 2 you will get q is equal to 2 third cd under root 2g l hs to 3 by 2 equation number 1 and if you can put the values of this cd etc you will get q is equal to 1.86 l hs to 3 by 2. So by comparing equation 1 and 2 the value of coefficient of discharge for a superiority wear is obtained as 0.632 and equation 2 this one that is 1.86 l hs to 3 by 2 is applicable only if the velocity of approach is neglected so VA we can calculate that is neglected however if the velocity of approach that is VA is to be considered then the equation 1 this one the equation 1 this equation 1 becomes q is equal to 1.86 l h 1 raise to 3 by 2 minus h a raise to 3 by 2. So h 1 is nothing but h plus h a which is equal to h plus V a square upon 2g h a is nothing but V a square upon 2g V a is the velocity of approach V a is with nothing but the velocity of approach. Now we will solve one problem on this particular superiority wear how it works how we can find out the discharge over this you see a water flows through a rectangular channel 1 meter wide and 0.5 meter deep and then over a sharp crystal superiority wear of crest length 0.6 meter if the water level in the channel is 0.2 to 5 meter above the wear crest calculate the discharge over the wear take coefficient of discharge as 0.6 and make correction for velocity of approach read the problem once again here if the velocity of approach is neglected first case then for a superiority wear q is equal to two-third cd under 2g l h raise to 3 by 2 if velocity of approach is taken into account again the formula is going to change so cd is given to you 0.6 length is given to you 0.6 meters head is 0.2 to 5 meter put these values put these values we will get 0.1135 meter cube per second now velocity of approach wear is equal to 0.1135 upon area you will get 0.2 to 7 meter per second then we can calculate h a which is nothing but wear score upon 2g it comes 0.2 to 6 meter and then find out h 1 h 1 and h 1 we required to find out when we are going to consider the velocity of approach h 1 is equal to h plus h a so h a is nothing but wear score upon 2g so for velocity of approach taken into consideration q is equal to 1.86 l into bracket h 1 raise to 3 by 2 minus h a raise to 3 by 2 put these values here also we will get 0.1153 meter cube per second here it is 0.1135 and here 0.1153 when velocity of approach is taken into account small increase we can observe over here when velocity of approach is taken into account this is the figure again for you are convinced is not wear trapezoidal wear discharge over this these are take a pause and just go through these questions these are the answers for these questions first dirty rectangular triangular and then go for trapezoidal wear these are the reference books for you you can find some more data from Google also you can find out some web series web on Google and just find go through this thank you.