Journal de génie civil et environnemental

One of the most important components of watershed monitoring is stream discharge. Currently small watershed monitoring is mostly limited to water quality sampling. Adding discharge measurements to current programs allows for the estimation of critical pollutant loading to the receiving stream. Additionally, discharge measurements can be used to establish a watershed water budget that in turn evaluates the status of groundwater storage in the watershed area. Flint Creek is a 59 square mile sub-watershed to the Fox River watershed in north eastern Illinois about 40 miles northwest of Chicago. Stream gages were constructed at five locations in the watershed. Once installed, the USGS conducted discharge measurements during various flow conditions to collect data to be used in stage-discharge relationship development. The resulting relationships were used to convert stage data recorded by the gages to discharge. At this point, stage-discharge data was used to estimate critical pollutant loading to the Fox River and the components of a water budget.

The increasing demand for sustainable practices in civil engineering has highlighted the potential of using recycled materials as a viable alternative to conventional construction resources. This paper explores the application of recycled materials in civil engineering, focusing on their benefits, challenges and overall impact on the construction industry. Recycled materials such as crushed concrete, Reclaimed Asphalt Pavement (RAP) and recycled glass are examined for their performance characteristics, economic feasibility and environmental benefits. The study reveals that integrating recycled materials into civil engineering projects not only reduces waste and conserves natural resources but also contributes to lower construction costs and improved structural performance. The findings suggest that while there are challenges associated with the use of recycled materials, including variability in material properties and regulatory hurdles, the advancements in technology and increased awareness among stakeholders are paving the way for more widespread adoption. The paper concludes with recommendations for future research and practical implementation strategies to enhance the effectiveness of recycled materials in civil engineering applications.

The development of portable multispectral colorimeters represents a significant advancement in analytical instrumentation, particularly for the detection and classification of metallic ions in various environmental, industrial and biomedical samples. This paper presents the design, development and application of a novel multispectral colorimeter optimized for real-time, on-site analysis. The device integrates advanced optical sensing technologies with computational algorithms to enhance sensitivity, specificity and operational flexibility. Applications span diverse sectors, including environmental monitoring, industrial quality control and health diagnostics, highlighting its potential to improve decisionmaking processes and regulatory compliance. The findings underscore the efficacy of the multispectral colorimeter in enhancing analytical capabilities and advancing scientific understanding across multiple disciplines.

The coupled shear wall system is one of the effective potential options in midrise and high rise reinforced concrete buildings design. In seismic design consideration it is very important to ensure that the flexural displacement capacity which is known as ductility should be greater than flexural displacement demand. Non-linear dynamic analyses are performed on 12 storey slender coupled shear wall buildings in 14 different models as per Canadian Code CSA-A23.3 14, except the coupling beams are modelled with conventional reinforcements. Inelastic rotational and curvature demand of 06 coupling beams on each building at different level which are modelled with conventional reinforcements are investigated and the results are compared with US building codes, ACI-318-19, ATC 40 and FEMA-273-356. Investigation shows that coupling beams modelled with conventional reinforcements the inelastic rotational and curvature demand are within the capacities. It has been observed also the overall flexural displacement capacity of the seismic force resisting system of 12 story coupled shear wall buildings in 14 different models in ductility approach. Curvature ductility demands are calculated from those models which are the function of displacement ductility demand and also the plastic hinge length. In ductility approach calculations it was observed that the maximum flexural compression zone length limitation without confinement reinforcement as per (CSA A23.3 1994) is not working with slender coupled shear wall (tension or compression wall), while considering the plastic hinge length as per CSA- A23.3 04 or CSA-A23.3 14; Separate formula has been proposed for maximum compression zone length limitation for coupled shear wall design in ductility approach.