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Subsurface Utility Engineering

Subsurface Utility Engineering (SUE) involves obtaining and depicting underground utility locations with information relative to the accuracy (quality level) of the locations. Documentation for SUE is composed of four pages, this is the first page.

There are 4 quality levels (QL) based on how the information is obtained. Utility QL "D" is location information obtained from existing records or oral recollections. Utility QL "C" is location information obtained by surveying and plotting visible above ground utility features and using professional judgment in correlating this information to quality level "D" data. Utility QL "B" is location information obtained through the application of appropriate surface geophysical methods to determine the existence and approximate horizontal position of subsurface utilities. Utility QL "A" is precise horizontal and vertical location of the utilities. These are obtained by actual exposure (or verification of previously exposed and surveyed utilities) and subsequent measurement of subsurface utilities, usually at a specific point.

The Department's verification process without a surveyed base map is essentially QL "D", and with a surveyed base map is considered QL "C".

A SUE Consultant will use Department records as well as perform their own records research. They review the surveyed base map and designate horizontal locations (for QL"B") and locating test holes (for QL "A") at specific locations. The Department will survey the flagging, paint marks, stakes or nails placed by the Consultant. This information is then processed and provided back to the SUE Consultant to perform quality control checks. They will electronically plot the locations on the base plans provided by the Department. The Consultant then provides the Department with electronic files containing utility locations. These will be included on the construction plans as well as plans showing the utility locations using different line styles depending on the quality level (accuracy) of the information.

The Department’s standard line styles are shown on the construction plans with the supplement plans provided by the Consultant (posted to the Bidding Website) containing the different QL line styles.

The Related Pages document how to use the OpenRoads SUE tasks to model underground drainage and utilities picked up by NHDOT Survey to create existing and proposed drainage and utilities features for representation on plans and sections. Information and drawings compiled as part of the Department's SUE data gathering should also be used to create the OpenRoads 3D SUE models.


Subsurface Utilities Design and Analysis

Subsurface Utilities Design and Analysis (SUDA) tools provide the civil designer and utility coordinator the ability to model underground features for purposes of planning, design decision making, and hydraulic design. These tools allow plan and profile layout as well as 3D modeling of all underground assets. This includes pipes, cables, ducts, electrical, communications, and any other network types. Virtually anything underground can be modeled with Subsurface Utility Design and Analysis tools.

New Hampshire Department of Transportation
PO Box 483  |  7 Hazen Drive  |  
Concord, NH  |  03302-0483
Tel: 603.271.3734  |  Fax: 603.271.3914