Calculate horizontal directional drilling (HDD) bore profiles — including max depth, midpoint depth, entry/exit grades, and obstacle clearance — from entry/exit elevations and bore angles. Use this before submitting bore permits or planning the drill path for road crossings, creek crossings, and utility installations.
Entry and exit angles are the angles at which the drill enters and exits the ground, measured from horizontal. The entry angle affects how quickly the bore reaches target depth. A steeper entry angle (15°) reaches depth faster but puts more stress on the drill string and limits the pipe radius for product installation.
The drill path from entry to exit is not straight — it curves from the entry angle to approximately horizontal, traverses at depth, then curves back up to the exit angle. The minimum bend radius of the product pipe limits how quickly these transitions can occur, which sets a minimum bore length for any given depth.
Entry angles for HDD are typically 8° to 20°. Smaller diameters and softer soils allow steeper entry angles. Stiffer pipes (HDPE 4" and under) can take 10–15° entry. Larger steel casings are typically 8–12°. The exit angle is often slightly shallower (6–10°) to allow for clean product installation.
Minimum depth depends on the obstruction being cleared (road, creek, utility) and the jurisdiction. Common minimums: roadway crossings 4–6 ft below subgrade, creek crossings 5 ft below channel bottom, utility crossings 24" clearance from other pipes. Many specs require 3–5 ft minimum cover for pipe protection.
HDD (Horizontal Directional Drilling) uses a steerable drill head and mud system, allowing curved bores and real-time tracking. Traditional horizontal boring (impact boring or auger boring) is non-steerable and only practical for straight crossings under 200 feet. HDD can go thousands of feet with precise placement.
Depth at any point = entry elevation − elevation at that station. For the bore profile, the bore transitions from the entry ramp angle to approximately flat, then transitions back up at the exit angle. The maximum depth typically occurs near the middle of the bore, influenced by the elevation difference between entry and exit points.
Walk-over locators (Digitrak, SubSite) use a sonde in the drill head transmitting signal to a surface receiver. The receiver displays depth, pitch, roll, and position. For deep bores (>20 ft) or under congested utilities, wire-line magnetic guidance systems like Paratrack provide higher accuracy with real-time depth and azimuth data.
Calculate HDD horizontal bore depth profile from entry/exit elevations and angles. Get max depth, midpoint depth, entry/exit grades, and obstacle clearance check.
Typical: 8°–15°
Typical: 8°–12°
HDD tracking systems, locators, and directional drilling accessories.
Shop Express Tools →Entry angles for HDD are typically 8° to 20°. Smaller diameters and softer soils allow steeper entry angles. Stiffer pipes (HDPE 4" and under) can take 10–15° entry. Larger steel casings are typically 8–12°. The exit angle is often slightly shallower (6–10°) to allow for clean product installation.
Minimum depth depends on the obstruction being cleared (road, creek, utility) and the jurisdiction. Common minimums: roadway crossings 4–6 ft below subgrade, creek crossings 5 ft below channel bottom, utility crossings 24" clearance from other pipes. Many specs require 3–5 ft minimum cover for pipe protection.
HDD (Horizontal Directional Drilling) uses a steerable drill head and mud system, allowing curved bores and real-time tracking. Traditional horizontal boring (impact boring or auger boring) is non-steerable and only practical for straight crossings under 200 feet. HDD can go thousands of feet with precise placement.
Depth at any point = entry elevation − elevation at that station. For the bore profile, the bore transitions from the entry ramp angle to approximately flat, then transitions back up at the exit angle. The maximum depth typically occurs near the middle of the bore, influenced by the elevation difference between entry and exit points.
Walk-over locators (Digitrak, SubSite) use a sonde in the drill head transmitting signal to a surface receiver. The receiver displays depth, pitch, roll, and position. For deep bores (>20 ft) or under congested utilities, wire-line magnetic guidance systems like Paratrack provide higher accuracy with real-time depth and azimuth data.