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Show barrage on currents and on slltlng-up slltlng-up have been studied on the model. The model Is so accurate that, when a current of muddy water was run through it, the mud particle were deposited so as to reproduce with extraordinary fidelity the Sana banks and shoals that exist In the real river. The results seem conclusive con-clusive that a liarra.ee could have no serious effects on shipping. British Engineers Plan Way to Harness Tides In Britain, the Severn estuary has big tides, and there Is a scheme for making a barrage across this. A detailed de-tailed official report was recently made on the project, writes a correspondent corre-spondent in the London Spectator. It would cost about 50,000,000 pounds and by itself could not compete com-pete with electrical power generated by burning coal. But with the aid of water power from the dams In the AVye valley nearby, It Is estimated estimat-ed that It could supply all the southwest south-west of England and Wales with power at two-thirds of the present cost. Schemes like this have to be careful care-ful not to upset existing arrangements, arrange-ments, and Bristol Is naturally very anxious lest a huge barrage should Interfere with navigation. In order to settle this question, wonderfully accurate models of the river bed have been made, and the effects of a |