• KIRIDI, EBIZIMOR ALEX
• David, Idibiye

This research examines the hydraulic roughness for Gabions filled with Rapana venosa shells for use as a sustainable alternative to the conventional rock-filled gabions in hydraulic engineering. Laboratory flume experiments were conducted to determine Manning's roughness coefficient (n) and the Darcy–Weisbach friction coefficient (f), under a controlled range of flow rates, from 0.01 m³/s to 0.05 m³/s. The n values for the Rapana venosa gabions ranged from 0.032 to 0.038, indicating that a greater hydraulic resistance was presented by these than rock gabions with n-values between 0.025 and 0.030. The shell-based gabions exhibited friction factor (f) values ranging from 0.048 to 0.056, which were higher than the friction factors for the conventional gabions, for which the values were between 0.036 and 0.042. These differences emphasize the influence of shell morphology and porosity on energy dissipation, flow resistance, and turbulence. According to the findings, Shell gabions are wonderful engineering works particularly to regulate drainage channel flows, erosion control measures, and eco-engineering of fragile ecosystems. Several disadvantages were identified, like uncertain long-term damages caused by natural hydraulic stresses and no field-scale validation available. This study establishes sustainable hydraulic engineering by demonstrating, both practically and environmentally, how invasive Rapana venosa shell-filled gabions can be used.

Darcy-Weisbach friction factor; Manning coefficient; Rapana venosa; hydraulic roughness; sustainable gabions

"Hydraulic Roughness of Rapana Venosa Gabions for Hydraulic Applications ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.12, Issue 11, page no.d775-d788, November-2025, Available :http://www.jetir.org/papers/JETIR2511386.pdf

"Hydraulic Roughness of Rapana Venosa Gabions for Hydraulic Applications ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.12, Issue 11, page no. ppd775-d788, November-2025, Available at : http://www.jetir.org/papers/JETIR2511386.pdf