🏗️ NSL (Natural Surface Level)
Definition: NSL is the original ground level before excavation, filling, or construction. It is also called Existing Ground Level (EGL).
🔹 Main Uses
Excavation: Determines soil removal depth.
Filling: Calculates required fill material.
Foundation: Establishes foundation levels.
Estimation: Calculates earthwork quantities.
Setting Out: Provides a reference for construction levels.
🔹 Surveying
Instruments: Auto Level or Total Station.
Datum: A fixed reference used to calculate Reduced Levels (RL).
🔹 Types of Levels
NSL/EGL: Existing ground level.
RL: Elevation relative to a datum.
FGL: Finished ground level.
FFL: Finished floor level.
📌 Importance: Ensures accurate planning, earthwork estimation, drainage design, and cost control.
@ETCONP
Definition: NSL is the original ground level before excavation, filling, or construction. It is also called Existing Ground Level (EGL).
🔹 Main Uses
Excavation: Determines soil removal depth.
Filling: Calculates required fill material.
Foundation: Establishes foundation levels.
Estimation: Calculates earthwork quantities.
Setting Out: Provides a reference for construction levels.
🔹 Surveying
Instruments: Auto Level or Total Station.
Datum: A fixed reference used to calculate Reduced Levels (RL).
🔹 Types of Levels
NSL/EGL: Existing ground level.
RL: Elevation relative to a datum.
FGL: Finished ground level.
FFL: Finished floor level.
📌 Importance: Ensures accurate planning, earthwork estimation, drainage design, and cost control.
@ETCONP
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