Show A dini dam A remarkable dam is about to bo be constructed ted by a water company at tho the sou san mateo canyon tour four miles from san mateo cal in order to form a reservoir the canyon is very ery narrow and steep and fifteen feet below the bottom is a solid rock on which the foundation of the dam I 1 will rest the structure will be feet high bight wide at the base 20 feet at the top and feet in length it will be the largest stone dam over ever known to have been built the dike will hay have e a curvature of 80 feet and the convex side will be up stream tho the material will bo be a new sort of concrete composed of stone the walls will be perfectly su smooth booth the reservoir that will be formed by it and the adjacent hills hill swill will be about eight miles in length and feet deep at the deepest places its capacity will be ba about gallons the water will bo be conveyed by tunnels to the city of san francisco chicago journal |