Al Samer and Umm Al Khair Flood Control Measures Project

Project Information

Client: HRH Prince Khaled Al Faisal bin Abdulaziz, Governor of Makkah Province
Location: Jeddah
Starting Date: May - 2011
Completion Date: November - 2011
Contract Value: SAR 420,184,832
Contract Value: USD 112,049,288
Scope of work: Civil
Project Manger: Ali Haider

Project Brief

The purpose of this project is to protect the areas of Umm Al Khair and Al Samer from rain floods. It is a part of the main project of controlling floods in all Jeddah city.

Following a series of inspection visits to Al Samer and Um Al Khair districts, and based on thorough analyses of the existing Dams’ condition, Almabani’s team underlined several recommendations approved by the Client to be executed on both sites. These steps comprise the following.

Al Samer Dam
The scope of works includes:

  • Installation of a 200 m sheet piles cut-off with concrete cap to stop seepage when the reservoir is impounding and to assist with the long-term stability of the Dam. The installation will take place at a depth of 20 m, with an area of 4000 sq. m.
  • Construction of a concrete lined 2800 m long double trapezoidal channel to be connected from Al Samer Dam to the existing Northern channel. The top channel’s depth and width are 3 m and 26 m/20 m respectively while those pertaining to the base channel are 1 m and 9 m/7 m respectively. The new channel is to be reconnected to the existing box culvert.
  • Construction of a trapezoidal channel to be connected from Emergency Dam to Al Samer Dam.
  • Construction of a box culvert under crossing.
  • Installation of a control outlet pipe with a 1500 mm diameter through the Dam,allowing lower return period rainfall event to pass to a downstream channel without the requirement for impoundment or pumping.
  • Construction of an overflow spillway.
  • Decommissioning of the pumping station and rising main.
  • Demolition of numerous existing buildings to facilitate the construction of the Channel


Umm Al Khair Dam
The scope of works includes:

  • Construction of a new 1000 m long and 7 m high Dam.
  • Bulk excavation beyond the new Dam to increase the Dam’s capacity.
  • Construction of a 60 m long triple cell box culvert, 2.3 m x 2.3 m each.
  • Replacement of the existing circular culvert with a concrete lined 780 m long trapezoidal channel extending from the existing Northern channel towards the Dam. The depth and width of the channel are 2.5 m and 17.5 m/ 7.5 m respectively. The new channel is to be reconnected to the existing box culvert.
  • Installation of a 1000 m long sheet pile cut-off at a depth of 15 m and with an area of 15,000 sq. m.
  • Construction of an overflow spillway.
  • Installation of new attenuation storage.
  • Installation of a new culvert crossing.
  • Demolition of existing Dam.
  • Demolition of several existing industrial buildings to facilitate the construction of the channel.