Review of Hydrological Study for Wadi Al-Laith Dam Design
Hexa Line Projects was commissioned by the Ministry of Environment, Water and Agriculture to review the hydrological study underlying the design of a dam on Wadi Al-Laith. The review ensured that the dam’s design parameters, particularly flood capacity and spillway design, were technically justified and aligned with current engineering standards.
| Client | Ministry of Environment, Water and Agriculture |
| Region | Al-Laith, Makkah Region |
| Year | 2021 |
| Category | Dam Design Hydrology Review |
Objectives
- Evaluate the hydrological design assumptions and methodologies used in the Wadi Al-Laith dam study.
- Verify the accuracy of design flood estimates and probability analysis.
- Assess the adequacy of spillway capacity design for flood safety.
- Identify any technical concerns that could affect the dam’s long-term safety and performance.
Methodology
The review critically assessed the hydrological methodology used in the original study, including frequency analysis, unit hydrograph derivation, and design storm development. Updated regional rainfall data were applied to verify design flood estimates. Comparative analysis against regional dam design standards was conducted to benchmark findings.
Deliverables
- Hydrological study review report with technical findings.
- Assessment of design flood estimates and frequency analysis.
- Spillway adequacy evaluation.
- Recommendations for design modifications or additional studies if warranted.
Significance & Impact
Dam safety is of paramount importance in Saudi Arabia where sudden flash floods can cause catastrophic failures with significant downstream consequences. This technical review of the Wadi Al-Laith dam hydrological study provided the Ministry with independent assurance that the dam design was based on a sound and adequate hydrological foundation.
