EESC 1158 Lecture : Water Notes Outline.docx
11 Mar 2014
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Early boston water supplies i: prior to 1795 there were local wills and springs (boston and back bay were nearly. Each house had its own water supply iii. entirely water) 1845 (cid:0) first westward expansion, sudbury river tributary dammed to create lake. Cochituate, aqueduct to brookline reservoir: when water from lake cochituate flowed into the frog pond on. E. g. , pre dam: 215 m^3/s, post dam: 87m^3/s. How much precipitation becomes runoff in the swift river watershed upstream of. Average annual precipitation = 44 in/yr = 112 cm/yr. Drainage area (a) = 86 mi2 = 482 km2. Discharge (q) =310 cfs= 8. 87 m3/s = 0. 280 km3/yr. This q is a pre-dam average from below the current quabbin reservoir. Start with basic equation for discharge: q = ra = runoff x area. Rearrange: r = q/a = (0. 280 km3/yr) / ( 482 km2) x (105 cm/1 km) = 58 cm/yr.
