Directional boring, also referred to as horizontal directional drilling (HDD), is a minimal impact trenchless method of installing underground utilities such as pipe, conduit, or cables in a relatively shallow arc or radius along a prescribed underground path using a surface-launched drilling rig. Directional Boring/HDD offers significant environmental advantages over traditional cut and cover pipeline/utility installations. The technique is routinely used when conventional trenching or excavating is not practical or when minimal surface disturbance is required.  Although often used interchangeably, the terms directional boring and horizontal directional drilling are distinct in that they convey a different sense of scale. The term "Directional Boring" or "Bore" is generally reserved for mini/small sized drilling rigs, small diameter bores, and crossing lengths in terms of hundreds of feet. Generally, the term Horizontal Directional Drilling (HDD) is intended to describe large/maxi sized drilling rigs, large diameter bores, and crossing lengths in terms of thousands of feet. Directional boring and HDD are similar in some respects to directional drilling associated with the oil industry, however, an equal comparison cannot be drawn as the procedures serve markedly different functions. Directional Boring/HDD can be utilized with various pipe materials such as PVC, polyethylene, polypropylene, ductile iron, and steel provided that the pipe's properties (wall thickness and material strength) enable it to be both installed and operated (if applicable) under acceptable stress limits.  Directional Boring/HDD is generally accomplished in three principal phases. First, a small diameter pilot hole is drilled along a directional path from one surface point to another. Next, the bore created during pilot hole drilling is enlarged to a diameter that will facilitate installation of the desired pipeline. Lastly, the pipeline is pulled into the enlarged hole, thus creating a continuous segment of pipe underground exposed only at the two initial endpoints. Directional Boring/HDD can be utilized to cross any number of surface obstacles including roadways, railroads, wetlands, and water bodies of varying sizes/depths.  The process is suitable for a variety of soil conditions including clay, silt, sand, and rock. Problematic soil conditions include large grain content in the form of coarse gravel, cobbles, and boulders. Installation of Pipelines by Horizontal Directional Drilling, An Engineering Design Guide (Arlington, VA: Pipeline Research Council International, Inc., 2008) Other subsurface conditions which can impact the feasibility of Directional Boring/HDD include excessive rock strength and abrasivity, poor rock quality, and rock exhibiting karst features.   Willoughby, David (2005). Horizontal Directional Drilling, p. 1-263. Mcgraw-Hill, New York. . Short, Jim (1993). Introduction to Directional and Horizontal Drilling, p. 1-222. PennWell Books, Tulsa, Oklahoma. . v. Hinueber, Edgar (iMAR Navigation) (2006). Most accurate drilling guidance by dead-reckoning using high precision optical gyroscopes, Proceedings NoDig Conference of Horizontal Directional Drilling, Brisbane 2006. 
Directional boring, also referred to as horizontal directional drilling (HDD), is a minimal impact trenchless method of installing underground utilities such as pipe, conduit, or cables in a relatively shallow arc or radius along a prescribed underground path using a surface-launched drilling rig. Directional Boring/HDD offers significant environmental advantages over traditional cut and cover pipeline/utility installations. The technique is routinely used when conventional trenching or excavating is not practical or when minimal surface disturbance is required. PR-277-144507-Z01 Installation of Pipelines by Horizontal Directional Drilling Engineering Design Guide (Arlington, VA: Pipeline Research Council International, Inc., 2015) Although often used interchangeably, the terms directional boring and horizontal directional drilling are distinct in that they convey a different sense of scale. The term "Directional Boring" or "Bore" is generally reserved for mini/small sized drilling rigs, small diameter bores, and crossing lengths in terms of hundreds of feet. Generally, the term Horizontal Directional Drilling (HDD) is intended to describe large/maxi sized drilling rigs, large diameter bores, and crossing lengths in terms of thousands of feet. Directional boring and HDD are similar in some respects to directional drilling associated with the oil industry, however, an equal comparison cannot be drawn as the procedures serve markedly different functions. Directional Boring/HDD can be utilized with various pipe materials such as PVC, polyethylene, polypropylene, ductile iron, and steel provided that the pipe's properties (wall thickness and material strength) enable it to be both installed and operated (if applicable) under acceptable stress limits. PR-277-144507-Z01 Installation of Pipelines by Horizontal Directional Drilling Engineering Design Guide (Arlington, VA: Pipeline Research Council International, Inc., 2015) Directional Boring/HDD is generally accomplished in three principal phases. First, a small diameter pilot hole is drilled along a directional path from one surface point to another. Next, the bore created during pilot hole drilling is enlarged to a diameter that will facilitate installation of the desired pipeline. Lastly, the pipeline is pulled into the enlarged hole, thus creating a continuous segment of pipe underground exposed only at the two initial endpoints. Directional Boring/HDD can be utilized to cross any number of surface obstacles including roadways, railroads, wetlands, and water bodies of varying sizes/depths. PR-277-144507-Z01 Installation of Pipelines by Horizontal Directional Drilling Engineering Design Guide (Arlington, VA: Pipeline Research Council International, Inc., 2015) The process is suitable for a variety of soil conditions including clay, silt, sand, and rock. Problematic soil conditions include large grain content in the form of coarse gravel, cobbles, and boulders. Other subsurface conditions which can impact the feasibility of Directional Boring/HDD include excessive rock strength and abrasivity, poor rock quality, and rock exhibiting karst features. PR-277-144507-Z01 Installation of Pipelines by Horizontal Directional Drilling Engineering Design Guide (Arlington, VA: Pipeline Research Council International, Inc., 2015) HDD Design Guideline Task Committee of the Technical Committee on Trenchless Installation of Pipelines (TIPS) of the Pipeline Division of the American Society of Civil Engineers. Pipeline design for installation by horizontal directional drilling - ASCE Manuals and Reports on Engineering Practice (MOP) No. 108 : ASCE manual of practice. American Society of Civil Engineers, 2005. Reston, VA. Skonberg, Eric R., and Tennyson M. Muindi. Pipeline design for installation by horizontal directional drilling - ASCE Manuals and Reports on Engineering Practice (MOP) No. 108 (2nd Edition). Reston, Virginia: American Society of Civil Engineers, 2014. Willoughby, David (2005). Horizontal Directional Drilling, p. 1-263. Mcgraw-Hill, New York. . Short, Jim (1993). Introduction to Directional and Horizontal Drilling, p. 1-222. PennWell Books, Tulsa, Oklahoma. . v. Hinueber, Edgar (iMAR Navigation) (2006). Most accurate drilling guidance by dead-reckoning using high precision optical gyroscopes, Proceedings NoDig Conference of Horizontal Directional Drilling, Brisbane 2006. Rizkalla, Moness. Pipeline geo-environmental design and geohazard management. New York, NY: ASME, 2008.
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PR-277-144507-Z01 Installation of Pipelines by Horizontal Directional Drilling Engineering Design Guide (Arlington, VA: Pipeline Research Council International, Inc., 2015)
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PR-277-144507-Z01 Installation of Pipelines by Horizontal Directional Drilling Engineering Design Guide (Arlington, VA: Pipeline Research Council International, Inc., 2015)
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PR-277-144507-Z01 Installation of Pipelines by Horizontal Directional Drilling Engineering Design Guide (Arlington, VA: Pipeline Research Council International, Inc., 2015)
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Installation of Pipelines by Horizontal Directional Drilling, An Engineering Design Guide (Arlington, VA: Pipeline Research Council International, Inc., 2008)
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PR-277-144507-Z01 Installation of Pipelines by Horizontal Directional Drilling Engineering Design Guide (Arlington, VA: Pipeline Research Council International, Inc., 2015)
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HDD Design Guideline Task Committee of the Technical Committee on Trenchless Installation of Pipelines (TIPS) of the Pipeline Division of the American Society of Civil Engineers. Pipeline design for installation by horizontal directional drilling - ASCE Manuals and Reports on Engineering Practice (MOP) No. 108 : ASCE manual of practice. American Society of Civil Engineers, 2005. Reston, VA. Skonberg, Eric R., and Tennyson M. Muindi. Pipeline design for installation by horizontal directional drilling - ASCE Manuals and Reports on Engineering Practice (MOP) No. 108 (2nd Edition). Reston, Virginia: American Society of Civil Engineers, 2014.
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Rizkalla, Moness. Pipeline geo-environmental design and geohazard management. New York, NY: ASME, 2008.