Plum Island Ecosystems LTER Database

Acceptance and utilization of LTER data requires that:

(1) The Principal Investigator be sent a notice stating reasons for acquiring any data and a description of the publication intentions.
(2) The Principal Investigator of the data set be sent a copy of the report or manuscript prior to submission and be adequately cited in any resultant publications.
(3) A copy of any resultant publications should be sent to:

Principal Investigator
Ecosystems Center
Marine Biological Laboratory
7 MBL St.
Woods Hole, MA 02543

Dataset URLs:METADATA: HTML, Rich Text, XML(EML compliant)
DATA: Comma Delimited, Excel file with Metadata and data
Dataset ID:WAT-YSI-Forest_2007.5
Dataset Title:Year 2007, 10 minute measurements of stage, water temperature in a small headwater stream draining draining a mainly forested catchment (55% forest + 19% wetland), Cart Creek, Newbury, MA.
Investigator 1: 
First Name:Wilfred
Last Name:Wollheim
Address line 1:Morse Hall
Address line 2:UNH
Address line 3:
Zip Code:03824
Associate Investigators:
Keywords:PIE LTER, disturbance, Parker River watershed, Cart Creek, forest, discharge, water temperature, water stage
Abstract:Year 2007, continuous measurements, every 10 minutes, were made of stage, water temperature in Cart Creek, Newbury, MA, a small headwater stream draining a mainly forested catchment (55% forest + 19% wetland) in the Parker River watershed. Discharge is determined from stage using discharge vs stage regressions.
Contact: Plum Island Ecosystems LTER Information Manager
The Ecosystems Center
Marine Biological Lab
7 MBL St
Woods Hole, MA 02543
Phone (508) 289 7485
Online URL:
Data File URL
Data File Name WAT-YSI-Forest-2007
Beginning Date 1/1/2007
End Date 12/31/2007
Number of Data Records 41757
Other Files to Reference All in the YSI series.
Availability Status Type 1
Quality Control Information
Maintenance Description Ongoing/Periodic with improvement of rating curve, particularly as more high discharge events are incorporated.
Log of Changes: This file was initially posted in September 2007.
Version 01, 30 Oct 2007 updated metadata to EML level 3+
Version 02, 22Jan2010 keyword update. This file was updated for the remainder of 2007. In addition, data from 1/1 to 7/4 was replaced with the correct data. The earlier version had data from the wrong site. It is now correct.
Version 03, 31Mar2010 metadata updates
Version 04, 22Mar2011 data and metadata updates. Discharge estimates were updated in November 2011. Used MarcrosExportEML_HTML (working)pie_excel2007.xlsm 2/28/2012 8:18 PM for QA/QC to EML 2.1.0
Version 05, 14May2013, metadata and data updated to comply with importation to Drupal and LTER PASTA. Used MarcrosExportEML_HTML (working)pie_excel2007.xlsm 3/14/13 12:02 PM for QA/QC to EML 2.1.0
Geographic Description Watershed water collection and stream characterization site for Cart Creek (forest landuse), Newbury, MA  
Location Bounding Box    
West Bounding Coordinate    
East Bounding Coordinate    
North Bounding Coordinate    
South Bounding Coordinate    
OR if single point location    
Latitude 42.7692  
Longitude -70.9165  
Taxonomic Protocols
Organisms studied
Methods:Depth and water temperature were measured using a HOBO data logger deployed in a stilling well.

Depths are corrected for barometric pressure changes using readings in an additional HOBO datalogger deployed at Marshview Farm. The HOBO is deployed in a a PVC tube, which was attached to ree-bar driven into the stream bed. The PVC tube has holes drilled to allow adequate water circulation.

ADDITIONAL RESEARCH LOCATION COORDINATES: In addition to the decimal degree coordinates given above, locations are also given here in Massachusetts State Plane coordinates. The stream is called Cart Creek and is located in Newbury MA. Some residential area is present. (~ 10% of the basin). In addition, I-95 passes through the center of the catchment, resulting in roughly 8% impervious surface area




Velocity measurements were made using a Marsh McBirney current meter. Discharge estimates in Cart Creek based on a power rating curve that contains measurements up to a depth of 0.8 meters, which is above bankfull stage.

The rating curve has an R2 of 0.96 using 32 measurements between 2001 and 2007. Rating curve has been standardized to HOBO_Depth to allow application of a single rating curve across years. All files in this series (2001-2006) are currently standardized to HOBO_depth.

The column Depth_Device is included when combining files from several years, over which several different devices were used to calculate depth. HOBO_Depth is the depth that is standardized across all measurement devices so that a single rating curve can be applied.

Discharge rating curve is based on rating curve developed in previous years (discharge measurements from prior to Summer 2007):
Discharge (l/s) = 731.91 (depth) ^ 5.5172
where depth is HOBO_Depth

The discharge rating curve used in this data set is subject to revision in the future as additional measurements are obtained.

The rating curve appears to have changed during the summer of 2007. The discharge estimates were updated in November 2011 using the new rating curve.

Prior to July 2009, velocity measurements were made using a Marsh McBirney current meter. After that, a Sontek Flowtracker was used. Discharge estimates in Cart Creek are based on a power rating curve that contains measurements up to a depth of 0.834 meters, which is above bankfull stage.

The new rating curve has an R2 of 0.95 using 32 measurements between Summer2007 and Fall 2011.

Discharge (l/s) = 1074.5*Depth^7.6501
where Depth is HOBO_Depth


1 -- Original discharge calculations. No changes to discharge estimates.
2 -- Updated discharge estimates using the newer rating curve.

Data Table

Variable Name Variable Description Units Measurement Scale Code Information Number Type DateTime Format Missing Value Code Missing Value Code Explanation
Date date (yyyy-mm-dd)   datetime     yyyy-mm-dd NA NA = not available
Time time (hh:mm) 24 hour   datetime     hh:mm NA NA = not available
Temp water temperature (oC) celsius interval   real   NA NA = not available
HOBO_Depth stage height standardized to HOBO depth (m) meter ratio   real   NA NA = not available
Depth_Device depth measurement device used to determine discharge   nominal YSI = YSI depth sonde | SIGMA = Sigma autosampler depth sonde | TEMP_HOBO = HOBO depth sonde deployed in temporary stilling well | HOBO = HOBO depth sonde deployed in permanent stilling well     NA NA = not available
Discharge discharge literPerSecond ratio   real   NA NA = not available
Flag Code referring to comment about the data (explanation in methods)   nominal 1 = original discharge calculation | 2 = updated discharge/newer discharge curve     NA NA = not available