WATERSHED & TERRAIN ASSESSMENT

How does water move across this site?

Understand terrain, drainage patterns, watershed characteristics, and the physical landscape

through GIS-based analysis.

DISCUSS A SITE →

THE CHALLENGE

Water follows the landscape.

Terrain influences how water moves across a site and where runoff may concentrate. Understanding elevation, slope, drainage patterns, and watershed context can provide valuable early insight into site conditions and help identify areas that may deserve closer investigation.

UNDERSTAND THE TERRAIN

Examine elevation, slope, relief, and other characteristics of the physical landscape.

TRACE THE DRAINAGE

Use elevation-based analysis to understand potential surface-flow paths and areas of concentrated drainage.

SEE THE BIGGER PICTURE

Understand how the site relates to surrounding watersheds, receiving waters, and upstream contributing areas.

ANALYSIS COMPONENTS

What can terrain and watershed GIS reveal?

Analysis components are selected based on the project question, study area, available elevation and hydrographic data, and agreed scope.

ELEVATION

  • Surface Elevation

  • Relief

  • Terrain Patterns

WATERSHEDS

  • Watershed Boundaries

  • Subwatersheds

  • Contributing Areas

SLOPE

  • Slope Gradient

  • Slope Classes

  • Steep Areas

HYDROGRAPHY

  • Streams & Rivers

  • Waterbodies

  • Mapped Surface Water

FLOW DIRECTION →

Which direction

would surface flow

move from each cell?

DRAINAGE

  • Flow Direction

  • Flow Accumulation

  • Potential Drainage Paths

SITE CONTEXT

  • Flood Hazards

  • Land Cover

  • Project-Specific Condition

FLOW ACCUMULATION →

Where does modeled

flow concentrate?

DRAINAGE PATTERNS →

Potential concentrated

flow paths

WATERSHEDS →

What land contributes

toward a common outlet?

ELEVATION →

How does the

terrain change?

WHAT YOU RECEIVE

Clear terrain and drainage information—not just elevation data.

Results are organized into clear maps, site statistics, watershed information, and documented observations designed to make the physical landscape easier to understand.

01 — TERRAIN MAPPING

Professional map exhibits showing elevation, slope, relief, and relevant terrain characteristics.

May include:

  • Hillshade

  • Elevation

  • Slope classes

  • Terrain context

02 — DRAINAGE & WATERSHED MAPPING

Maps showing modeled drainage patterns, watershed boundaries, hydrography, and contributing areas.

May include:

  • Flow accumulation

  • Drainage paths

  • Watersheds

  • Streams and rivers

03 — SITE & WATERSHED FINDINGS

Statistics and observations summarizing relevant terrain and watershed characteristics.

May include:

  • Elevation range

  • Slope distribution

  • Watershed area

  • Contributing area

  • Drainage observations

OPTIONAL DELIVERABLE

Interactive Watershed & Terrain Map

Explore terrain, watershed boundaries, drainage patterns, hydrography, and other project layers through a client-friendly interactive GIS application.

EXPLORE INTERACTIVE WEB GIS →

04 — DOCUMENTATION

Documentation describing the datasets, processing assumptions, methodology, and important analytical limitations.

May include:

  • Elevation source

  • Resolution

  • Hydrography source

  • Processing criteria

  • Assumptions

HOW IT WORKS

From elevation data to landscape insight.

01 — DEFINE

Establish the site and question.

Define the project area, drainage question, desired analysis, available information, and appropriate study extent.

Supporting:

  • Site

  • Question

  • Study Area

  • Objectives

02 — MODEL

Build the terrain framework.

Prepare appropriate elevation and hydrographic data and derive the terrain and drainage information required for the assessment.

Supporting:

  • Elevation

  • Terrain

  • Flow

  • Hydrography

03 — INTERPRET

Evaluate the landscape.

Examine terrain patterns, drainage characteristics, watershed relationships, and relevant site statistics.

Supporting:

  • Slope

  • Drainage

  • Watersheds

  • Statistics

04 — DELIVER

Communicate the findings.

Present the results through clear maps, observations, documentation, and optional interactive GIS tools.

Supporting:

  • Maps

  • Findings

  • Documentation

  • Web GIS

DEMONSTRATION PROJECT

See the landscape through GIS.

Explore a demonstration assessment showing how elevation and hydrographic information can be used to characterize terrain, drainage patterns, and watershed context.

THE QUESTION

How does terrain influence drainage across this site?

Study Area
XX acres

Elevation Range
XXX–XXX ft

Watershed Area
XX acres

Predominant Slope
X–X%

SCOPE & LIMITATIONS

Planning-level insight into terrain and drainage.

Watershed & Terrain Assessment is a GIS-based planning and decision-support service. Results reflect the elevation, hydrographic, and other geographic datasets, processing methods, assumptions, and analytical criteria included in the agreed project scope.

GIS-derived drainage paths, watershed boundaries, and terrain characteristics represent modeled or mapped conditions and may differ from actual field conditions.

The assessment does not replace site-specific surveying, engineering, hydrologic or hydraulic analysis, stormwater design, flood studies, environmental investigations, regulatory determinations, or other professional services where required.

The objective is to provide an early understanding of the landscape, identify meaningful terrain and drainage patterns, and help focus additional investigation where appropriate.

TRYING TO UNDERSTAND A SITE?

See what the landscape is telling you.

Tell us about the property, project area, or drainage question you're working through. BRMS can help determine whether a GIS-based watershed and terrain assessment can provide useful early insight.

DISCUSS A SITE →
REQUEST A GIS OPPORTUNITY SNAPSHOT →