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Storage effect created by cross laid weft yarns of runoff erosion control geomeshes has a significant influence on their performance. A theoretical model was proposed (prism model) in the recent past to evaluate the storage volume of the geomeshes (micro-barriers), but it has the limitation that is has not considered the warp and weft yarn interlacement. Therefore, a revised pyramid storage model is formulated in this paper by considering the yarn interlacement. To validate the proposed model, plain woven geomeshes are subjected to runoff erosion test at different slope angles (soil slope) in a bench-scale setup. Variation between experimental culmination and calculated culmination due to storage effect is compared by its percentage difference. It is observed that percentage difference between experimental culmination and calculated culmination is lower for proposed pyramid model at all slope angle and mass. It is also observed that at increased slope angle, percentage difference between calculated storage volume and experimental result increases for both pyramid and prism storage model, due to the reduced storage volume. In addition, pyramid storage model has been formulated for different open weave geomeshes by considering the weft yarn interlacement and float length. Theoretically, it is observed that initial increase in float length shows a significant increase in storage volume, but further increase in float length results in a limited increase in storage volume. The results correlate with the past studies on different woven geomeshes. Hence, the proposed storage model with consideration of yarn interlacement and weave can be used for optimising the performance of geomesh at different soil slope angles.

Theoretical model to estimate the storage volume of rolled erosion control products/geomeshes