Hydrological and Flood Risk Studies
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Engineering & Survey Services

Hydrological & Flood Risk Studies

Water finds the lowest point — the question is whether your site planning found it first. Terren maps how water actually moves across a site before it becomes a drainage problem after construction.

01

Overview

Understanding where water moves before construction begins.

Wadi paths, runoff concentration, low-lying ground — in much of Saudi Arabia's terrain, ignoring these isn't an option. Flood risk is a defined planning concern in cities like Jeddah, where drainage capacity and wadi behaviour directly affect site safety — the same considerations Terren applies to projects across Riyadh, Dammam and other flood-sensitive regions. We review catchments and flow patterns to flag where flooding or drainage risk could affect a site, then turn that into practical input for road planning, industrial layouts and infrastructure corridors, before it becomes an expensive surprise mid-construction.

Technology

CATCHMENT MAPPINGGISFLOW MODELINGDRAINAGE REVIEW

Applications

Wadi-influenced terrainIndustrial developmentInfrastructure corridorsRoad planningPlant sitesDrainage-sensitive areasFlood-prone landDevelopment plots
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Technical Method

From catchment understanding to flood risk support.

Catchment & Flow Review

Upstream catchments, wadi paths, low points and drainage directions are reviewed to understand how water may move through or around a project site.

Rainfall & Runoff Understanding

Rainfall intensity, surface runoff behaviour and likely flow concentration points are interpreted to support drainage and flood risk awareness.

Flood Exposure Assessment

Project-sensitive areas are reviewed for potential flood exposure, ponding, crossing risk and drainage limitations.

Planning Support Outputs

Findings are organized into project-facing notes, maps and summaries that help consultants, contractors and developers make informed decisions.

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What We Cover

Technical scope under hydrology and flood risk review.

Catchment delineation support

Wadi flow path identification

Rainfall intensity review inputs

Peak flow and runoff understanding

Flood exposure review for site planning

Flood depth and extent mapping support

Drainage path assessment

Culvert and crossing review inputs

Flood protection recommendation support

04

Deliverables

Clear reporting for drainage and flood-sensitive decisions.

Catchment and drainage path support summaries

Wadi flow and surface runoff interpretation notes

Flood exposure review for planning and design teams

Drainage-sensitive area identification

Culvert, crossing and stormwater review inputs

GIS-ready flood or drainage layers when required

Flood protection and mitigation recommendation support

Clear reporting to support technical decisions