URI Watershed Watch: 25 Years of Documenting RI s Waters
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1 URI Watershed Watch: 25 Years of Documenting RI s Waters Elizabeth Herron Linda Green Arthur Gold University of Rhode Island - Natural Resources Science URI Cooperative Extension
2 Annual Monitoring Data ppb CHLOROPHYLL LEVELS Elevated algae levels - Eutrophic Moderate algae levels - Mesotrophic Low algae levels - Oligotrophic 27-Apr 11-May 25-May 8-Jun 22-Jun 6-Jul 20-Jul 3-Aug 17-Aug 31-Aug 14-Sep 28-Sep 12-Oct 26-Oct 27-Apr 11-May 25-May 8-Jun 22-Jun 6-Jul 20-Jul 3-Aug 17-Aug 31-Aug 14-Sep 28-Sep 12-Oct 26-Oct Low water clarity - Eutrophic Secchi Depth Bottom Depth Moderate water clarity - Mesotrophic Excellent water clarity - Oligotrophic Depth (m) WATER CLARITY (Secchi Depth Transparency) 12 mg/l DISSOLVED OXYGEN / TEMPERATURE Degrees C m 6.5m Surface Temp 1m 6.5m Apr 11-May 25-May 8-Jun 22-Jun 6-Jul 20-Jul 3-Aug 17-Aug 31-Aug 14-Sep 28-Sep 12-Oct 26-Oct
3 Multi-Year Trophic State Annual Median (Middle) Secchi Depth Transparency Depth (m) Low water clarity - Eutrophic Moderate water clarity - Mesotrophic Excellent water clarity - Oligotrophic Annual Median (Middle) Chlorophyll Level Elevated algae level - Eutrophic Moderate algae level - Mesotrophic Low algae level - Oligotrophic ppb Annual Mean (Average) Total Phosphorus Level Elevated nutrient level - Eutrophic Moderate nutrient level - Mesotrophic Low nutrient level - Oligotrophic Annual Mean (Average) Total Nitrogen Level Elevated nutrient level - Eutrophic Moderate nutrient level - Mesotrophic Low nutrient level - Oligotrophic ppb ppb
4 Weather
5 Multi-year
6 Other Long Term Data
7 Local Water Quality Trends URIWW Locations with 3 or more years of data only
8 Chlorophyll - Algae
9 Total Phosphorus
10 Total Nitrogen
11 Trophic State Comparison URIWW Locations with 3 or more years of data
12 Overall WQ Trends URIWW Locations with 3 or more years of data
13 Lakes by Overall TSI URIWW Locations with 3 or more years of data only
14 Other findings..
15 Bacteria Swimming areas generally good Rainfall increases bacteria levels beyond acceptable ranges Rural and urban watersheds Watershe d code MONITORING LOCATION MAY JUNE JULY AUG. SEPT. OCT. GEOMEAN Most Probable Number of Enterococci per 100 ml A Annaquatucket - RR Xing NA Buckeye Brook Novelty Rd NA Buckeye Brook Lockwood Brk NA Buckeye Brook Warner Brook NA Buckeye Brook Mill Cove WD Falls River D - Step Stone WD Falls River C - Austin Farm WD Falls River B - Sand Banks WD Falls River A - Twin Bridges GB GB #2 - Burger King 31 > >795 GB GB #3 - Rte > >253 GB GB #4 - Mill Creek 52 > >320 GB GB #5 - Hardig Upstream GB GB #6 - Tuscatucket Br < GB GB #7 - Southern Creek A Himes River H HW #1A- Scrabbletown Falls H HW #1B - Rte 4 Bridge H HW #5 - Sandhill Brook (Saw Mill Inlet) H HW #6 - Hunt Forge Rd TH Moosup Upstream >24196 >608 TH Moosup A - Fairbanks Bridge TH Moosup C - Deerfield Drive WD Pawcatuck Bradford PA Pawtuxet River - near Rhodes WD Queen Locke Brk WD Queen Sherman Brk < WD Shickasheen Rte DRY DRY WD Miskiania Road WD Barber Pond Outlet <2 6.3 WD Shickasheen Rte WD Shickasheen Liberty Lane WD White Horn Bike Trail WD White Horn Ministerial Rd WO Woonasquatucket Greystone Pnd WO Woonasquatucket Donigian >9678 >404 WO Woonasquatucket Waterplace GB GrBay #6 - Ponaug Marina GB GrBay #13 - EG Town Dock 42 < WD Pawcatuck River - North of WWTP <10 - <10 23 WD Pawcatuck River - South of WWTP < WD Pawcatuck River - At the Mouth 64 <10 <10 < <10 SK Sapowet Marsh #1 > >208 SK Sapowet Marsh #2 > < >39 SK Sapowet Tributary # SK Sapowet Tributary # NA Wickford Cove - West of Loop Dr < Lab error NA Wickford Cove - East of Loop Dr < Lab error
16 Chlorides
17 How Does URIWW Data Compare?? National Lakes Assessment Statistical approach, assesses randomly selected locations Nationally consistent methods 5 year rotating cycle 2007, 2012 Other water systems similar approach
18 2007 NLA compared 1972 NES National Eutrophication Survey Information of nutrient sources, concentrations, and impacts to lakes
19 How Does URIWW Data Compare?
20 Chlorophyll TSI Comparison
21 URIWW Parameters Field Secchi Depth Water Temperature Dissolved Oxygen Chl. - a Processing Laboratory ph Alkalinity Total & Dissolved Phosphorus Total, nitrate and ammonium nitrogen Chlorophyll - a Chlorides Bacteria Way too much information and too complex to summarize easily
22 Take Home Messages Bacteria levels after rainfall are high EVERYWHERE (urban drainages worse, but ) Algal blooms and water temperatures are increasing In general many of our waterways have been resilient so far It s much more difficult to RESTORE than to PROTECT We ALL need to do our part
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