Lecture #7 Eutrophication, limiting nutrients and the Mill River - PowerPoint PPT Presentation

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Updated: 28 September 2017 Print version Lecture #7 Eutrophication, limiting nutrients and the Mill River David A. Reckhow CEE 577 #7 1 Cultural Eutrophication Many correlated WQ problems Floating mats of algae Low DO High P?

Updated: 28 September 2017 Print version Lecture #7 Eutrophication, limiting nutrients and the Mill River David A. Reckhow CEE 577 #7 1
Cultural Eutrophication  Many correlated WQ problems  Floating mats of algae  Low DO  High P? David A. Reckhow CEE 577 #6 2
Mill River  With Lake Warner Field site David A. Reckhow CEE 577 #6 3
USGS sites 8 7 6 5 2 4 3 1 David A. Reckhow CEE 577 #6 4
USGS site data # Description USGS DA Latitude Longitu Information Number (mi 2 ) de 1a Mill River at N. Hadley 01170722 42°23'07" 72°34'54" 4 flows (1987) 1b Mill River at N. Hadley 01170720 42°23'08" 72°34'53" 1 WQ sample (1973) 2 Mill River site 3 near 01170718 42°23'27" 72°33'46" No data Amherst 3 Mill River site 2 near 01170717 42°23'10" 72°33'03" 2 flows, 1 WQ sample (1987) Amherst (@Mill site road) 01170715 5 flows (1987) 4 Mill River site 1 near 42°23'18" 72°32'24" Amherst (near WWPP) 5 Mill River injection site 01170714 42°23'49" 72°32'22" No data near Amherst 6 Cushman Brook at N. 01170710 15.4 42°24'57" 72°30'57" 2 flows (1938, 1965) Amherst 7 Atkins Reservoir 422532072291501 42°25'32" 72°29'15" No data 8 Roaring Brook at E. 01170700 7.28 42°26'18" 72°28'59" 7 flows and 3 WQ samples (1971-1973) Leverett David A. Reckhow CEE 577 #6 5
Lake Nutrient Classification Phosphorus Trophic State Lake Use Conc. (mg/L) Suitable for water-based recreation and propagation <0.010 Oligotrophic of cold water fisheries, such as trout. Very high clarity and aesthetically pleasing. Excellent as a drinking water source. 0.010 - 0.020 Mesotrophic Suitable for water-based recreation but often not for cold water fisheries. Clarity less than oligotrophic lake. Reduction in aesthetic properties diminishes overall 0.020 - 0.050 Eutrophic enjoyment from body contact recreation. Generally very productive for warm water fisheries. High TOC and algal tastes & odors make these waters less desirable as a water supply. A typical "old-aged" lake in advanced succession. > 0.050 Hyper- Some fisheries, but high levels of sedimentation and eutrophic algae or macrophyte growth may be diminishing open water surface area. Generally, unsuitable for drinking water supply. David A. Reckhow CEE 577 #6 6
 To next lecture David A. Reckhow CEE 577 #7 7

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