MD DNR Water Quality Mapping Project 2003

Metadata:

Identification_Information:      top
Citation:
Citation_Information:
Originator:
Maryland Department of Natural Resources, Resource Assessment Service (MD DNR RAS)
Publication_Date: 20040101
Title: MD DNR Water Quality Mapping Project 2003
Geospatial_Data_Presentation_Form: Spatial dataset
Description:
Abstract:
This record describes one year of an on-going water quality monitoring project. A total of seventy-six mapping cruises were conducted on Maryland waterbodies. The Bush, Chester, Chicamacomico, Gunpowder, Magothy, Middle, Patuxent and Severn Rivers, and coastal bays were mapped at least monthly between May and October 2003. The Chester and Patuxent Rivers and Coastal Bays, due to their large size, were were sampled over a two-day period.

Water quality mapping was conducted using DATAFLOW, a compact, self-contained surface water quality mapping system deployed in a small boat operating at planing speeds of 46 km/hr (25 kts) or less. Measurements were made approximately every four seconds or 30 meters (100 feet). Seven water quality parameters were measured: water temperature, salinity, conductivity, dissolved oxygen, turbidity, fluorescence and pH as well as water depth. The DATAFLOW system sampled water at approximately 0.5-m depths below the surface.

Additional water-quality measurements were made at ninety-six calibration stations. During each mapping cruise, "grab" samples were collected at between six and nine stations per water-body segment. Calibration samples were collected, after stopping the boat, at 0.5-m depth and filtered on site. Secchi depth and photosynthetic active radiation measurements were taken at the same time.

Laboratory analyses were performed on calibration samples. Chlorophyll a, total dissolved nitrogen, particulate nitrogen, nitrite, nitrite + nitrate, ammonium, total dissolved phosphorus, particulate phosphorus, orthophosphate, dissolved organic carbon, particulate carbon, silicic acid, total suspended solids, volatile suspended solids, and turbidity values were determined.

Purpose:
The Maryland Department of Natural Resources Shallow Water Monitoring program is part of a cooperative effort between the Federal government and State and local governments in the Chesapeake Bay watershed to assess the ambient water quality criteria for dissolved oxygen, chlorophyll and water clarity in shallow water habitats.

Water quality mapping provides data on variability and patchiness that is valuable in establishing water quality criteria, and in determining attainment of those criteria. For example, spatial information on turbidity can be correlated to the spatial coverage of living resources such as bay grasses -Submerged Aquatic Vegetation (SAV). This information can be used to determine and assess water clarity criteria necessary to support SAV growth, address the progress of meeting SAV restoration goals, and target specific locations for SAV restoration.

Spatially intensive data can also help pinpoint localized areas of water quality concern, such as areas of low dissolved oxygen that can cause fish kills, and their possible links to nearby land uses or point sources.

Water quality maps can capture localized areas of algae blooms, high turbidity, or low dissolved oxygen that may adversely affect living resources in shallow water habitats and spawning areas.

Spatial data can also be aggregated across watershed units to aid in the evaluation of entire systems. Water quality mapping data are integrated with data from other Bay water quality stations and living resources monitoring projects and used to understand linkages, temporal variation and long-term trends.

Water quality data are used to refine, calibrate and validate Chesapeake Bay ecological models. The models are used to develop and assess water quality criteria with the goal of removing the Chesapeake Bay and its tidal rivers from the list of impaired waters.

Supplemental_Information:
The target audiences for this information include Resource Managers, Technical/Scientific Users, Government, Educators, Students and General Public.

Data users who desire very detailed information about Water Quality Monitoring data-definition, sampling-procedures and data-processing are encouraged to refer to the two documents listed below. The documents may be obtained from The Chesapeake Bay Program Office.

Water Quality Database - Database Design and Data Dictionary Prepared For: U.S. Environmental Protection Agency, Region III, Chesapeake Bay Program Office, January 2004.[<http://www.chesapeakebay.net/pubs/cbwqdb2004_RB.PDF>]

Quality Assurance Project Plan for the Maryland Department of Natural Resources Chesapeake Bay Shallow Water Monitoring Program for the period April 1, 2003 - June 30, 2004.

Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20030423
Ending_Date: 20031030
Currentness_Reference: Ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -79.4938
East_Bounding_Coordinate: -75.0405
North_Bounding_Coordinate: 39.7425
South_Bounding_Coordinate: 37.8713
Keywords:
Theme:
Theme_Keyword_Thesaurus:
Olsen, L.M., G. Major, S. Leicester, K. Shein, J. Scialdone, H. Weir, S. Ritz, C. Solomon, M. Holland, R. Bilodeau, T. Northcutt, R. Vogel. 2004. NASA/Global Change Master Directory (GCMD) Earth Science Keywords. Version 4.2.2 [online: <http://gcmd.nasa.gov/Resources/valids/keyword_list.html>]
Theme_Keyword:
EARTH SCIENCE > Biosphere > Aquatic Habitat > Estuarine Habitat
Theme_Keyword:
EARTH SCIENCE > Biosphere > Aquatic Habitat > Rivers/Stream Habitat
Theme_Keyword:
EARTH SCIENCE > Biosphere > Ecological Dynamics > Nutrient Cycling
Theme_Keyword:
EARTH SCIENCE > Biosphere > Ecological Dynamics > Primary Production
Theme_Keyword: EARTH SCIENCE > Hydrosphere > Surface Water > Rivers/Streams
Theme_Keyword:
EARTH SCIENCE > Hydrosphere > Water Quality/Water Chemistry > Chlorophyll
Theme_Keyword:
EARTH SCIENCE > Hydrosphere > Water Quality/Water Chemistry > Conductivity
Theme_Keyword:
EARTH SCIENCE > Hydrosphere > Water Quality/Water Chemistry > Nitrogen Compounds
Theme_Keyword:
EARTH SCIENCE > Hydrosphere > Water Quality/Water Chemistry > Nutrients
Theme_Keyword:
EARTH SCIENCE > Hydrosphere > Water Quality/Water Chemistry > Oxygen
Theme_Keyword:
EARTH SCIENCE > Hydrosphere > Water Quality/Water Chemistry > pH
Theme_Keyword:
EARTH SCIENCE > Hydrosphere > Water Quality/Water Chemistry > Phosphorous Compounds
Theme_Keyword:
EARTH SCIENCE > Hydrosphere > Water Quality/Water Chemistry > Suspended Solids
Theme_Keyword:
EARTH SCIENCE > Hydrosphere > Water Quality/Water Chemistry > Turbidity
Theme_Keyword:
EARTH SCIENCE > Hydrosphere > Water Quality/Water Chemistry > Water Temperature
Place:
Place_Keyword_Thesaurus: Producer Defined
Place_Keyword: United States
Place_Keyword: Maryland
Place_Keyword: Chesapeake Bay Watershed
Place_Keyword: Anne Arundel County
Place_Keyword: Baltimore County
Place_Keyword: Calvert County
Place_Keyword: Dorchester County
Place_Keyword: Harford County
Place_Keyword: Kent County
Place_Keyword: Queen Annes County
Place_Keyword: Worcester County
Place_Keyword: Bush River
Place_Keyword: Chester River
Place_Keyword: Chicomacomico River
Place_Keyword: Fishing Bay
Place_Keyword: Gunpowder River
Place_Keyword: Magothy River
Place_Keyword: Middle River
Place_Keyword: Patuxent River
Place_Keyword: Severn River
Place_Keyword: Transquaking River
Access_Constraints: None
Use_Constraints: None
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Mark Trice
Contact_Position: Chief, Tidal Water Quality Assessment
Contact_Address:
Address_Type: Mailing Address
Address: Tawes State Office Building, 580 Taylor Avenue, D2
City: Annapolis
State_or_Province: MD
Postal_Code: 21401
Contact_Voice_Telephone: 410 260-8630
Contact_Electronic_Mail_Address:
MTRICE_nospam_@dnr.state.md.us[Remove _nospam_ for valid email address]
Browse_Graphic:
Browse_Graphic_File_Name: MDDNRDataflow03Stns.jpg
Browse_Graphic_File_Description:
Overview map of 80 DATAFLOW calibration station sites located on Maryland Chesapeake Bay tributaries.[<http://www.chesapeakebay.net/comet_uploads/7424/MDDNRDataflow03Stns.jpg>]
Browse_Graphic_File_Type: JPEG
Data_Set_Credit:
Maryland Department of Natural Resources (MDDNR) Resource Assessment Service (RAS) staff collected the samples and processed the data. The Maryland Department of Mental Health and Mental Hygiene (DHMH) analyzed pigments and turbidity samples. The Nutrient Analytical Services Laboratory (NASL) at the Chesapeake Biological Laboratory (University of Maryland) analyzed nutrient and suspended solids samples.

The project was made possible with funding provided by The State of Maryland, the United States Environmental Protection Agency Chesapeake Bay Program, the National Atmospheric and Oceanic Administration Chesapeake Bay Program Office, the National Atmospheric and Oceanic Administration National Estuarine Research Reserve System program and Harford County Maryland.

Data_Quality_Information:      top
Attribute_Accuracy:
Attribute_Accuracy_Report:
Quality Assurance/Quality Control. MD DNR followed specific procedures to ensure that the DATAFLOW component of the Shallow Water Quality Monitoring Program project design was properly implemented and managed with sufficient accuracy, precision and detection limits. Accuracy (closeness to the true value) of collected data was controlled and assured by the proper use, calibration and maintenance of both field and laboratory equipment for the measurement of physical and chemical parameters.

The YSI 6600 sondes were configured with the following probes: 6560, 6562, 6025, and 6136. Resolution, range and accuracy specifications for the sonde and probes may be obtained from the manufacturer. <http://www.ysi.com/environmental-monitoring/data-acquisition.htm>

The procedures to control and assure the accuracy of field measurements involved the calibration of field instruments, the verification of calibrations, equipment maintenance, and collection of filter blanks. Most of the details of how data acquired with YSI sondes were quality assured and quality controlled are described in the process description elements in the Lineage portion of this metadata record. The results of the water quality attributes analyzed in the laboratories were also used to calibrate and crosscheck the sonde data for accuracy.

PAR sensors were returned to LICOR, Inc. prior to the field season for factory calibration.

Daily quality control checks (including the running of blanks and standards) were used to control and assure laboratory accuracy.

Accuracy of laboratory results was also assessed through DNR's participation in the Chesapeake Bay Coordinated Split Sample Program (CSSP), a split sampling program in which five laboratories involved in Chesapeake Bay monitoring analyze the coordinated split samples. CSSP was established in June 1989 to establish a measure of comparability between sampling and analytical operations for water quality monitoring throughout the Chesapeake Bay and its tributaries. DNR followed the protocols in the Chesapeake Bay Coordinated Split Sample Program Implementation Guidelines (EPA 1991) and its revisions. Split samples were collected quarterly. Results were analyzed by appropriate statistical methods to determine if results differed significantly among labs. If a difference occurred, discussions began regarding techniques and potential methods changes to resolve discrepancies.

Additionally, CBL and DHMH participated two times per year in the United States Geologic Survey (USGS) reference sample program.

Finally, BOAT_SPEED and TOTAL_DEPTH values listed in the DFLOW_DATA table are not considered reliable and should be used only with great caution.

Logical_Consistency_Report:
Two of the attributes in the water quality data set are PARAMETER and VALUE. In cases where PARAMETER value is "SIGMA_T" and the VALUE measurement in the record is as negative number, the number should be considered unreliable. TOTAL_DEPTH measurements acquired by the DataFlow instrumentation are inherently inaccurate due to a variety of issues associated with using depth sounders while moving at high speeds. The data should be used with caution and validated with additional data sources. Depth values greater than 100 m. are masked within the data set.
Completeness_Report:
The 2003 DATAFLOW project dataset includes mapping and calibration data acquired during one sampling run each month, between May and October 2003, at the following locations: Bush River, Chester River, Chicamacomico River/Fishing Bay, Gunpowder River, Magothy River, Middle River, Patuxent River and Severn River, and Maryland coastal bays.

Sampling-event and water-quality-calibration pigment, nutrient and suspended solid data from 96 stations are included in the dataset. Samples were collected at eight sites on each of the Bush, Magothy, Middle and Severn Rivers, nine Fishing Bay/Chicamacomico River sites, nine Gunpowder River sites, sixteen sites on the Chester River, fourteen sites on the Patuxent River and sixteen sites in Maryland's coastal bays,

Contour maps based on 2003 Dissolved Oxygen, Salinity, Turbidity, Temperature and Chlorophyll data acquired during DATAFLOW monthly mapping cruises are available on-line.[<http://mddnr.chesapeakebay.net/sim/dataflow_data.cfm>]

The user may discover a few interruptions in sonde datasets. These interruptions were related to short-term problems with sonde operation.

All other missing attribute values were masked because the data were determined to be unreliable during the quality control process.

Lineage:
Process_Step:
Process_Description:
SONDE CALIBRATION and POST-CALIBRATION:

The Yellow Springs Instrument (YSI) 6600 data sondes equipped with 6562 DO probe, a 6560 conductivity/temperature probe, a 6136 turbidity probe, and a 6025 chlorophyll probe were maintained and calibrated before and after each deployment in accordance with YSI recommendations. <http://www.ysi.com/environmental-monitoring/data-acquisition.htm>

CONTINUOUS SURFACE WATER QUALITY MAPPING:

DATAFLOW Mapping System DATAFLOW is a compact, self-contained surface water quality mapping system, suitable for use in a small boat operating at planing speeds of about 25 KT. The system collects water through a pipe ("ram") deployed on the transom of the vessel, pumps it through an array of water quality sensors, then discharges the water overboard. A bubble-trapping device ensures that no air bubbles are conveyed to the sensors, preventing errors that might be caused by such bubbles.

Water quality instrumentation consisted of a YSI 6600 Sonde equipped with a flow-through chamber. Sensors included a Clark-type YSI 6562 DO probe, a YSI 6560 conductivity/temperature probe, a 6136 turbidity probe, and a 6025 chlorophyll probe. The sonde transmitted data collected from the sensors to a YSI 650 data logger.

Positioning and depth instrumentation consisted of a Garmin GPS/MAP 168 Sounder. The data logger matched the position data with water-quality sensor data for each observation. The Garmin 168 GPS transmitted NMEA data to a small form factor computer. A DATAFLOW/Labview program was used to merge position and depth data with data collected by the logger and create an output file.

The system was equipped with an inline flow meter. Although the flow rate did not affect sensor readings, decreased flow was an indication of either a partial blockage or an interruption of water flow to the instrument. Flow data was used in the field as a diagnostic tool to ensure that the system was working properly and later, as a quality assurance tool, to verify that water flow was uninterrupted. A boat horn was wired to the flow meter. If the flow-rate fell below 3.0 l s-1, the horn sounded and warned operators that a problem needed to be corrected.

Cruise tracks varied depending on the water body being mapped. In general, a square-wave pattern was followed by alternately sampling shallow shoreline areas, and open, deeper waters while traveling up and downriver. Alternative cruise paths were followed if tributary size, shape impediments, or obstructions dictated otherwise. Cruise patterns were selected to obtain representative coverage of shallow water habitats and open waters so that segment-wide criteria could be assessed as accurately as possible. Navigational issues and placement of representative calibration sites also determined ultimate cruise tracks.

WATER QUALITY CALIBRATION SAMPLES:

At each Calibration station, "Grab" water quality samples were collected from the outflow of the DATAFLOW unit.

The samples were collected at the same time the HydroLab surface sample was recorded. Numbered two quart bottles were triple-rinsed and filled with water for "whole" and "filtered" nutrient and chlorophyll samples. A labeled sixteen-ounce bottle was triple-rinsed and filled with water for turbidity analysis.

Nutrient, pigment and suspended-solid water-samples were filtered on station or shortly thereafter. Sample waters and filters were placed on ice immediately after filtration.

Particulate samples included: Chlorophyll, Particulate Carbon, Particulate Nitrogen, Particulate Phosphorus (PP), Particulate Inorganic Phosphorous (PIP), Total Suspended Solids (TSS) and Volatile Suspended Solids (VSS).

Filtrate collected from TSS/VSS or PP/PIP filtrations was used for dissolved nutrient samples. Total Dissolved Nitrogen and Total Dissolved Phosphorus, Nitrate, Nitrite, Ammonia, Orthophosphate, Silicate and Dissolved Organic Carbon samples were collected.

HYDROLAB PROFILE:

The first reading of the HydroLab water-column profile at each Calibration station was recorded at the same time the water quality "grab" sample was collected. The first HydroLab record logged was for the 0.5-meter depth. The sonde was then lowered to the bottom. A reading was taken at 0.3-meters above the bottom. The sonde was raised and measurements were recorded at 0.5-meter or 1.0-meter increments until it reached the surface. (In cases where station depth was greater then 3-meters, the sonde was raised in 1-meter increments).

SECCHI DEPTH:

Secchi Disk Depth was measured at each Calibration station. Readings with the secchi disk were made in-situ without the aid of sunglasses. The secchi disk was lowered into the water and the depth at which it is no longer visible is recorded. The secchi depth reading was taken near the stern of the vessel and the time at which the reading is taken is noted (to the second) from the Global Positioning System. This facilitated later matching of secchi depth readings with transmissometer and turbidity data.

PAR MEASUREMENT:

Underwater Photosynthetically Active Radiation (PAR, 400-700nm)

At each calibration station, down-welling light penetrating the water column (PAR) was measured underwater at several depths to calculate the light attenuation coefficient, Kd. Simultaneous deck and submersed PAR intensity measurements were taken to account for variability in incident surface irradiance due to changes in cloud cover. Data collected from this procedure was used to estimate the depth of the photic zone.

The equipment used was manufactured by LI-COR, Inc. and consisted of a LI-192SA, flat cosine Underwater Quantum Sensor, a LI-190SA air (deck) reference sensor and a Data Logger (LI-1000 or LI-1400).

Deck and underwater readings were recorded simultaneously. Readings were allowed to stabilize before being recorded. If the station depth was less than 3 meters, readings were taken at 0.1 meter and at 0.25-meter intervals until 10% for the 0.1-meter reading was reached. If the station depth was greater than 3 meters, a reading was taken at 0.1-meter and at 0.5-meter intervals until 10% of the 0.1-meter reading was reached.

DATAFLOW FILE POST-PROCESSING:

Each raw .txt file, created by DATAFLOW/LabView during a mapping cruise, was post-processed. The file was opened in Excel and renamed. Rows of data acquired before and after mapping were deleted. Records (if any) were also deleted if they not have associated GPS values. A macro was executed that rearranged columns and inserted error-tracking columns and headings. Next, a macro was run that flagged negative values, missing values and highlighted values outside each parameter's normal range. The macro also returned a report summarizing exceedances. Mapping cruise event and instrument information was appended to each record.

Flagged values were evaluated. Common anomalies included spikes in fluorescence and turbidity, dips in specific conductance, extremely high dissolved oxygen readings. Instrument post-calibration results, in situ comparisons with HydroLab, LI-COR readings, historical data from near-by locations and, survey-crew remarks were used to determine whether sensor values were acceptable.

In cases where data were determined to be unreliable, the reason(s) values were determined to be "bad" were documented with error codes and comments. Unreliable data were masked. No data were discarded. All DATAFLOW data for each mapping cruise; both good and "bad", were retained in an archival file. Only data considered reliable were published in reports.

VERIFICATION AND DATA MANAGEMENT:

At the end of the monitoring season, DNR Tawes Office and Field Office personnel conducted additional data QA/QC procedures. All of the water quality calibration "grab" sample data were plotted. Outliers and anomalous values were thoroughly researched. Staff compared unusual values to historic values from the site and values from nearby sites in the Bay. Weather events were considered, event logs were reviewed and field staff were consulted regarding possible legitimate causes for the values. In cases where values were not legitimate, they were masked from the published dataset with the approval of the field staff and the Quality Assurance Officer.

Process_Date: Unknown
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Sally Bowen
Contact_Position: Project Chief, Monitoring Field Office, DNR
Contact_Address:
Address_Type: mailing and physical
Address: 1919 Lincoln Drive
City: Annapolis
State_or_Province: Maryland
Postal_Code: 21401
Country: USA
Contact_Voice_Telephone: 410 2630-3369
Contact_Electronic_Mail_Address:
SBOWEN_nospam_@dnr.state.md.us[Remove _nospam_ for valid email address]
Process_Step:
Process_Description:
Laboratory analysis -MD DHMH. Turbidity samples were analyzed by Maryland Department of Health and Mental Hygiene's (DHMH) Environmental Chemistry Division. Active chlorophyll a for all grab samples, except samples collected at four sites on the lower Patuxent River, was analyzed by DHMH.

Further information about laboratory analytical procedures may be obtained from the "Process_Contact".

Process_Date: Unknown
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Asoka Katumuluwa
Contact_Position:
Chief, Division of Environmental Chemistry, Laboratory Administration, Maryland Department of Health and Mental Hygiene
Contact_Address:
Address_Type: mailing and physical
Address:
Department of Health and Mental Hygiene, 201 West Preston Street
City: Baltimore
State_or_Province: Maryland
Postal_Code: 21201
Country: USA
Contact_Voice_Telephone: 410 767-5839
Contact_Electronic_Mail_Address:
KatumuluwaA_nospam_@dhmh.state.md.us[Remove _nospam_ for valid email address]
Process_Step:
Process_Description:
Laboratory analysis -CBL University of Maryland's Chesapeake Biological Laboratory (CBL), Nutrient Analytical Services Laboratory analyzed total dissolved nitrogen, particulate nitrogen, nitrite, nitrite + nitrate, ammonium, total dissolved phosphorus, particulate phosphorus, particulate inorganic phosphorus, orthophosphate, dissolved organic carbon, particulate carbon, silicic acid, total suspended solids, and volatile suspended solids. Chlorophyll a for the lower Patuxent River sites: Benedict, Chesapeake Biological Laboratory, Kings Landing, and Pin Oak were analyzed at CBL.

Further information about laboratory analytical procedures may be obtained from the "Process_Contact".

Process_Date: Unknown
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Carl Zimmerman
Contact_Address:
Address_Type: mailing and physical
Address:
Chesapeake Biological Laboratory, Center for Environmental and Estuarine Studies, The University of Maryland System, 1 Williams St; P.O. Box 38
City: Solomons
State_or_Province: Maryland
Postal_Code: 20688
Country: USA
Contact_Voice_Telephone: 410 326-7252
Contact_Electronic_Mail_Address:
carlz _nospam_@cbl.umces.edu[Remove _nospam_ for valid email address]
Spatial_Data_Organization_Information:      top
Indirect_Spatial_Reference:
Bush River, Chester River, Chicamacomico River/Fishing Bay, Gunpowder River, Magothy River, Middle River, Patuxent River, Severn River, Transquaking River, Coastal Bays, Maryland, USA
Direct_Spatial_Reference_Method: Point
Spatial_Reference_Information:      top
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 0.0001
Longitude_Resolution: 0.0001
Geographic_Coordinate_Units: Decimal degrees
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 298.257
Entity_and_Attribute_Information:      top
Overview_Description:
Entity_and_Attribute_Overview:
This metadata record is a description of a water-quality mapping project. Project data are an aggregation of 2003 data collected during seventy-six DATAFLOW mapping cruises conducted on Maryland Coastal Bays and the Bush, Chester, Gunpowder, Magothy, Middle, Patuxent and Severn Rivers.

The data are contained in four related entities (tables): Station_Information, Monitoring_Event_Data, Water_Quality_Data and DFLOW_DATA. Each table contains attributes (fields).

The entity Station_Information is comprised of the attributes: STATION, DESCRIPTION, WATER_BODY, CBP_BASIN, TS_BASIN, BASIN, CBSEG_1985, CBSEG_1998, CBSEG_1998_DESCRIPTION, HUC8, CATALOGING_UNIT_DESCRIPTION, HUC11, WATERSHED, FIPS, STATE, COUNTY/CITY, FALL_LINE, LATITUDE, LONGITUDE, LL_DATUM, UTM_X, and UTM_Y.

The entity Monitoring_Event_Data is comprised of the attributes: EVENT_ID, SOURCE, AGENCY, PROGRAM, PROJECT, STATION, EVENT_START_DATE, EVENT_START_TIME, CRUISE, TOTAL_DEPTH, UPPER_PYCNOCLINE, LOWER_PYCNOCLINE, AIR_TEMP, WIND_SPEED, WIND_DIRECTION, PRECIP_TYPE, TIDE_STAGE, WAVE_HEIGHT, CLOUD_COVER, GAGE_HEIGHT, PRESSURE, FLOW_STAGE, and DETAILS.

The entity Water_Quality_Data is comprised of the attributes: EVENT_ID, SOURCE, PROJECT, STATION, SAMPLE_DATE, SAMPLE_TIME, DEPTH, LAYER, SAMPLE_TYPE, SAMPLE_ID, PARAMETER, QUALIFIER, VALUE, UNIT, METHOD, LAB, PROBLEM, DETAILS, TOTAL_DEPTH, UPPER_PYCNOCLINE, LOWER_PYCNOCLINE, LAT, and LONG.

The entity DFLOW_DATA is comprised of the attributes: SAMPLE_DATE, SAMPLE_TIME, STATION, WATER_BODY, PRI-SEG, SONDE, LATITUDE, LONGITUDE, TOTAL_DEPTH, TOTAL_DEPTH_A, BOAT_SPEED, BOAT_SPEED_A, BATT, BATT_A , WTEMP, WTEMP_A, SPCOND, SPCOND_A, SALINITY, SALINITY_A, DO_SAT, DO_SAT_A, DO, DO_A, PH, PH_A, TURB_NTU, TURB_NTU_A, FLUOR, FLUOR_A, TCHL_PRE_CAL, TCHL_PRE_CAL_A, CHLA, CHLA_A and COMMENTS.

The DFLOW_DATA table contains 332,354 records.

Maps created by interpolating the Dissolved Oxygen, Turbidity, Chlorophyll a, Salinity and Temperature data acquired during mapping cruises may be downloaded from <http://mddnr.chesapeakebay.net/sim/dataflow_data.cfm>

Entity_and_Attribute_Detail_Citation:
Water Quality Database - Database Design and Data Dictionary Prepared For: U.S. Environmental Protection Agency, Region III, Chesapeake Bay Program Office, January 2004. <http://www.chesapeakebay.net/pubs/cbwqdb2004_RB.PDF>

Quality Assurance Project Plan for the Maryland Department of Natural Resources Chesapeake Bay Shallow Water Monitoring Program for the period April 1, 2003 - June 30, 2004.

Metadata_Reference_Information:      top
Metadata_Date: 20050718
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Ben Cole
Contact_Address:
Address_Type: Mailing and physical address
Address:
Maryland Department of Natural Resources, D-2 580 Taylor Avenue
City: Annapolis
State_or_Province: MD
Postal_Code: 21401
Contact_Voice_Telephone: (410) 260-8630
Contact_Electronic_Mail_Address:
bcole_nospam_@dnr.state.md.us[Remove _nospam_ for valid email address]
Metadata_Standard_Name: Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Generated by mp version 2.8.22 on Fri Jan 19 13:37:17 2007