Poor downstream passage at a dam creates an ecological trap for migratory fish

The Three Gorges Dam: an ecological perspective

development throughout the world for thousands of years, providing water, controlling floods, irrigating crops, facilitating navigation, creating recreational opportunities, and generating motive power and electricity. By the end of the 20th century, about 45 000 large dams (>15 m in height) and an estimated 800 000 small dams had been built worldwide (WCD 2000), obstructing over 65% of fresh w...

Fish passage issues at Lake Tuakitoto

Planning Guide for Fish Passage at Pittsburgh District Dams

Background. The US Army Engineer (USACE) District, Pittsburgh (LRP) is preparing the "Upper Ohio Navigation Study, Pennsylvania" Feasibility Study and Integrated Environmental Impact Statement (EIS). This study will examine alternatives for replacing aging navigation locks on the three uppermost navigation facilities on the Ohio River: Emsworth, Dashields, and Montgomery (EDM) Locks and Dams. S...

Blockage of migration routes by dam construction: can migratory fish find alternative routes?

The present study explored the interaction between the upriver migration of fish and the blockage of their migration routes by dam construction. Specifically, we studied (i) the capacity of migratory fish to locate alternative routes in the presence of an obstacle, and (ii) the behavior of the fish after they were artificially transferred to the reservoir. With the use of the markrecapture tech...

River Analysis System Model for Proposed Weirs at Downstream of Large Dam, Thailand

This research was conducted in the Lower Ping River Basin downstream of the Bhumibol Dam and the Lower Wang River Basin in Tak Province, Thailand. Most of the tributary streams of the Ping can be considered as ungauged catchments. There are 10pumping station installation at both river banks of the Ping in Tak Province. Recently, most of them could not fully operate due to the water amount in th...