SECA were involved in the design, supervision, and/or management of several roads and bridges projects, valued for over xxx million SR .
- Al-Mezahmeyah Bridge. Riyadh, Saudi Arabia. .
- Al Jamsh Roads & High Way. Riyadh, Saudi Arabia. Completed 2011.
- Jeddah Road Project. Jeddah, Saudi Arabia. Completed 2007.

SECA were involved in the design, supervision, and/or management of several major waste water and water drainage projects, valued for over xxx million SR .
- East Jeddah Flood Control project
- Makkah Flood drainage project, Makkah Al- Mukarramah, Saudi Arabia.
- Zolfi and Ghaet Flood Control project
- Wadi Al-Asla Project, Supervision of the construction of Three transporting lines of sewage & treated water and Irrigation of 6 million square meter Land. Jeddah, saudi Arabia. Completed 2010
A -Al-Asla Sewage Plant
B - Al-Asla pipe Lines
C -Al-Asla Sewage Plant

SECA provides premume support for several municipal servises.
- Technical support for Al-Jemsh Town Municipality, Riyadh, Saudi Arabia.
