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

STATION STATE X STATE Y
WAT-PR-Newbury-YSI-CC 247680 946790

NOTES AND COMMENTS:

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.

CALCULATIONS:
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.

DISCHARGE UPDATE (11/2011):
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.

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

FLAG:

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