TRANSIENT GROUNDWATER FLOW - COOPER JACOB METHOD

In Cooper Jacob method, when we have to determine the value of storativity we have to find the value of t(0) that is the time when drawdown is 0 means no drawdown started in the pumping well. So after plotting the values we will get the slope, before extrapolating the slope, we have to erase the first 4 coordinates and last 2 coordinates from our graph, then we will get a perfect straight line, then we have to extrapolate the slope and whereever it will meet at x axis, that will be the value of t(0). This part I didn't mention in the video for that I m writing in the description.