Calculation of RL by HI method |Hindi Auto Level #numericals#leveling #himethod#civil #survey#ctevt

This video provides a step-by-step tutorial on how to calculate the Reduced Level (R.L.) using the Height of Instrument (H.I.) method (also known as the Collimation method) in surveying. The tutorial demonstrates the process using a sample numerical problem involving an auto-level. Key steps covered in the video include: Setting up the Field Book: Organizing data into columns for Station, Back Sight (B.S.), Intermediate Sight (I.S.), Fore Sight (F.S.), Height of Instrument (H.I.), and R.L. (0:30-0:45). Identifying Sight Types: Explaining how to classify readings as B.S., I.S., or F.S. based on the instrument's position and when it is shifted (0:49-4:06). Calculation Procedures: Height of Instrument (H.I.): Calculated as R.L. + B.S. (4:36-4:49). Reduced Level (R.L.): Calculated as H.I. - I.S. or F.S. (5:08-5:21). Handling Instrument Shifts: Proper recording and calculation when the instrument is moved to change points (CP1, CP2, CP3) (9:12-9:33). Arithmetic Check: Ensuring the accuracy of the calculations using the formula: Summation of B.S. - Summation of F.S. = Last R.L. - First R.L. (10:29-11:31). Height of Instrument (H.I.) method is a method of reducing levelling data to find the Reduced Level (R.L.) of different points. It is also called the Collimation Method. This method is very simple and fast, so it is commonly used in surveying. 🔹 Important Terms Benchmark (B.M.) A fixed reference point whose R.L. is known. Back Sight (B.S.) First reading taken on a known R.L. (usually on B.M.). Intermediate Sight (I.S.) Reading taken on intermediate points. Fore Sight (F.S.) Last reading taken before shifting the instrument. Reduced Level (R.L.) Height of a point above or below the datum. Height of Instrument (H.I.) Height of line of collimation (line of sight) above datum. 🔹 Formula Used 1️⃣ Height of Instrument :( RL + BS) 2️⃣ Reduced Level of any point : ( HI - IS/FS) 🔹 Step-by-Step Procedure Set up the level instrument. Take B.S. on benchmark. Calculate H.I. Take I.S. readings on required points. Calculate R.L. of each point. Take F.S. on change point before shifting. Shift instrument and repeat. Height of method | line of collimation | auto level | dumpy level | survey numericals | HI methods of numerical hi method,height of instrument method,rise and fall method,line of collimation method,hi method solved problems,how to calculate rl using hi method,hi method survey#hi method survey numericals,rise and fall method in levelling,important problems on hi method,important problems in hi method #hi method,height of instrument method,numericals on hi method of levelling#levelling numericals,hi method of levelling,levelling,rise and fall method in levelling#height of instrument method numerical,levelling height of instrument method,numericals on levelling,levelling numerical solved#rise and fall method,method of levelling,line of collimation method,hi method survey numericals,solved numericals of hi method,levelling methods,hi method levelling#survey #surveying #levelling#autolevel#dumpy #himethod#backsight#forebearing #ctevt #purbanchaluniversity #purbanchal #pokharauniversity #kathmanduuniversity #tribhuvanuniversity #trainyourbrain #brain #engineering #diplomacivil#dce #diplomaincivilengineering #ctevtedge# Hindi