How to determine the corrected reduced level using the rise and fall method in surveying

Question

please give examples

Answer 1

its done in table form & is basically BS - FS to give a rise or a fall.

if its a rise add it to the reduced level. If its a fall take it away.

(you should have been given a bench mark for a level for the starting point - i.e the reduced level starting point - 25.000 metres in this example)

--------------------------------------...

BS **** | ***** FS **** | *** Rise  *** | *** Fall * | ** Reduced Level

1.821  *|*************** |***************|***********|** 25.000

0.772 **|**** 1.422 ****|**  0.399  ***|***********|**  25.399

*********|****  2.965  **|***************|  2.193 ***|**  23.206

you can see the pattern hopefully, the * mean a space as the formatting of yahoo ruins the table.

1.821 - 1.422 = a rise of 0.399  therefore 25.000 become 25.399

0.722 - 2.965 = a fal of 2.193 there 25.399 becomes 23.206