Amanda Hope Dr. Bill McDowell, Dr. Wil Wollheim For this study, - PowerPoint PPT Presentation

Amanda Hope Dr. Bill McDowell, Dr. Wil Wollheim

 For this study, culver erts and longer ger : • Run underg underground (under parking lots, roads, buildings, etc.) • Full ully enc enclo losed within a pipe pipe (6’) • No lig light ht source Intr ntrod oducti tion on

PIPED S ED STREA REAM Streams th Stre that f t flow low in in concre rete te/ a / asphalt lt ditc ditches bu but t are re expo posed to to ligh light a t and d th the s surro rroundin ing lan andscape ar e are e cal called ed “dit “ditches” in in th this is stu tudy dy DITCH TCH Intr ntrod oducti tion on

>17,0 ,000 ro road d cro rossin ings in in New H Hamps pshire Map p do doesn’t ’t in inclu lude piped s pipe d stre reams u unde der driveways, pa driv park rkin ing lo lots, , buildin bu ildings, o , or r other surf rfaces Lemay 2008 (personal comm.) Intr ntrod oducti tion on

 Prevalence may increase with urbanization  Little empirical evidence regarding biogeochemical processes in piped streams  Restoration/management efforts Elmore and Kaushal 2008, Walsh et al. 2005

 Characterize ecosystem processes in a piped stream ◦ Measure NH4 + and PO4 3- Uptake ◦ Measure Ecosystem Metabolism ◦ Other characteristics  Compare results from piped reaches to non-piped reaches Intr ntrod oducti tion on

Open ( n (Refe ferenc nce) Reach ach Pipe ipe 1 1 (Conc oncrete) Dow owns nstream m 1 Dit Ditch (Ston tone) Pipe ipe 2 2 (Metal al) Dow owns nstream m 2 250 m Metho thods

 Combin bined N d NH 4 + /P /PO 4  Upstream eam-Dow Downstre tream m 3- solu olute additi ddition u usin ing B Br - O 2 ch chan ange w w/reaera rati tion on an and Rhodamin mine as as t tracer acers dete de termined u d usin ing SF SF 6 Hauer & Lamberti 2007, LINX Protocol (Potter, pers. comm.) Metho thods

NH4 PO4 • NH4-N: 20-75 ug/L • PO4-P : 3-12 ug/L • NO3-N: 70-600 ug/L NO3 • Cl: 25-270 mg/L Cl

NH NH 4 Upt Uptak ake Ve Velocity a a b b 0 Resul ults ts

b PO PO 4 Upta Uptake ke Vel Velocity a a 0 Resul ults ts

ND ND Resul ults ts

2 ) Peak Light (lum/ft Reach Peak H 2 O Temp. (C) k O 2 (1/min ) Q (L/s) Velocity (m/min) 3000 17 0 5 1.06 Open (Reference) 0 22 0.015 5.2 5.91 Pipe 1 (Concrete) 17000 22 0.015 5.2 3.53 Downstream 1 (Open) 11000 22 0.015 27.4 7.5 Ditch (Stone, Open) 0 22 0.012 27.4 6.14 Pipe 2 (Metal) Resu sults/ s/ Discussio Dis ion

 NH4 + and PO4 3- V f values within range found in literature, although on low end (Hall et al . 2002, Ensign & Doyle 2006)  Uptake was measured in piped stream reaches  In some cases, uptake velocities in piped stream reaches were significantly higher than nearby open reaches  Related to Energy Limitation? Sediments? Pools? Other characteristics??? Dis Discussio ion

 Ecosystem metabolism results similar to Mulholland et al. 2001  Most reaches were heterotrophic  Related to Light? Temp? Nutrients? Other?  First look at biogeochemical processes in piped stream reaches  Additional study needed Dis Discussio ion

3- uptake velocities  What are NH 4 + and PO 4 during Open Canopy?  Is there NO 3 uptake at summer baseflow?  Is there DOC uptake at summer baseflow?  Will my Ecosystem Metabolism results be supported by additional measurements?  What are FBOM, Chl. a, and TSS/sediment amounts? Dis Discussio ion

 Thank you! to my committee: Dr. Bill McDowell, Dr. Wil Wollheim, and Dr. Gretchen Gettel  Jody Potter, Jeff Merriam, Adam Baumann, Michelle Daley, and Jeff Schloss for field/lab assistance, advice, and materials  NH Water Resources Research Center for funding aman andaj ajhope@gm gmail.com