How do you calculate road RL? | road level calculation

Use of a Dumpy Level in Level Control During Foundation Works Dumpy level is commonly used leveling instrument to locate the points in same horizontal plane. It is also called as automatic level or builder’s level. Elevations of different points and distance between the points of same elevation can be determined by dumpy level. The dumpy level is mainly used to, 1.To determine relative height and distance among different locations of a surveying land. 2.To determine relative distance among diffe