Most of the existing roughness estimation methods for water tunnels are related to either unlined or concrete/steel-lined tunnels. With the improvement in shotcrete technology. advancement in tunneling equipment and cost and time effectiveness. future water tunnels built for hydropower projects will consist of rock support with the extensive use of shotcrete lining in combination with... https://countryscenesaddleryandpetsuppliers.shop/product-category/work-and-harness-leather-headstalls/