Hundreds of infrastructure investment projects are inserted into the Iraqi government budget annually. Many of these projects suffer from suspension, delay in completion, corruption, or other negative issues known in Iraqi construction projects. This may harm the country's economic recovery due to allocating funds to useless projects from one or more feasibility studies' components. Therefore, the best solution is to pay attention to the feasibility study reports. This study highlights the importance of feasibility studies reports for investment projects and their effective role in evaluating project ideas to ensure an equitable distribution of a country's financial resources to the most feasible investment projects. This importance was highlighted through a practical case study for a solid waste treatment project. The results of the case study showed that feasibility studies provide very important information on which investors and governments can rely to make the appropriate decisions for investment projects. The study also addressed the risks that investors can be exposed to in Iraq and how to include them in the economic analysis of feasibility studies.

California Bearing Ratio (CBR) values are critical to the properties of granular subgrade materials and play a significant role in determining the design variables of several flexible pavement design methods. Concrete waste is considered an environmental problem in many regions of Iraq. Therefore, its removal is of significant environmental value when used to improve the properties of certain materials, such as the granular sub-base examined in this study. This research examined the impact of substituting particles measuring 19 mm to 12 mm in granular sub-base materials, class C and D, with crushed concrete waste at replacement rates of 25%, 50%, 75%, and 100% while preserving their gradation characteristics, on the CBR value. The CBR examination results showed that the most significant improvement in the CBR value was observed at a 100% replacement ratio, attaining 55.84% and 57.22% at a 1 mm penetration for the unsoaked C and D samples, respectively, and 63.32% and 48.11% for the soaked condition at a 1 mm penetration for the C and D samples, respectively. The increase in CBR was correlated with an increase in Optimum Moisture Content (OMC) and a decrease in maximum dry unit weight (γdry max), demonstrating that the percentage increase in CBR is non-linear. An increase in CBR may be helpful in the foundation base for many projects.