BIOL 4673 Lecture Notes - Lecture 5: Disinfectant, Hemoglobin, 24Hours

• School: Acadia University
• Department: Biology
• Course: BIOL 4673
• Professor: Alexandre G R O S J E A N

Document Summary

Lecture 3: waterborne hazards and the human health. World problems: quantity of water, quality of water. Stress o(cid:374) the (cid:449)orld"s (cid:373)ajor ri(cid:448)er basi(cid:374)s: water stress<1700 cubic meters/year/person, water scarcity<1000 cubic meters/year/person (north africa, southern u. s, uneven distribution of water across the earth, areas in extreme deficiency of available water. World problems: some areas have lots of water but the largest rivers are far from agricultural and population centers. Lots of people living in an area but resources are far, need to deliver water from place it is available to where it is need: lots of precipitation arrives during short period but cannot be collected and stored. Lake ontario regenerates quickly, balance between recharge and withdrawal: areas where too much water is withdrawn, they shrink in size, water that is (cid:449)ithd(cid:396)a(cid:449)(cid:374) does(cid:374)"t (cid:272)o(cid:373)e (cid:271)a(cid:272)k to sa(cid:373)e (cid:396)i(cid:448)e(cid:396), p(cid:396)e(cid:272)ipitatio(cid:374) (cid:449)ould(cid:374)"t (cid:271)e i(cid:374) sa(cid:373)e area. Water is returned back to reservoir but not in the same area.