The HDC Team

John specializes in the development of discharge ratings and computation of streamflow at gaging stations using USGS methods. He has conducted streamflow measurements under extreme hydrologic conditions for use in several USGS urban hydrology reports. While Chief, Hydrologic Data Section with the Tampa USGS, he supervised the maintenance, collection and computation of data from over 95 streamflow stations, 200 wells and numerous meteorological and water quality stations.

John specializes in the computation of complex streamflow records using established hydraulic and hydrologic procedures such as development of stage-discharge, fall-ratio/discharge-ratio, stage-area and mean velocity/Index velocity rating curves, and rating of gated control structures based on current meter and Acoustic Doppler Current Profiler discharge measurements. John develops head-gate opening-discharge ratings for gated control structures and head-discharge ratings for culvert sites. He determines and applies datum and shifting-control corrections. He estimates daily discharges during times of missing gage-height record by hydrographic comparisons with meteorological data and records from nearby stations with similar runoff characteristics. Writes periodic and end of water year Station Analyses, which explains and documents methods used in the computation of discharge records. This is complex, technical work reviewing and correcting sampling methods and procedures or reviewing and correcting raw hydrologic and meteorological data to ensure reliability and validity of the data or; developing and instructing hydrologic staff in sample collection techniques to ensure the reliability of the data collected.

In addition to the standard activities of collecting and computing water resources data Denis participated in other activities with the USGS. These included survey party chief for many indirect measurements of peak flows that included culverts, bridge contractions, and slope-area methods. He constructed weirs across streams in order to establish fixed controls. He served as the public relations officer as well as liaison with USGS Headquarters in Reston, Virginia, providing monthly Water Resources Review Information. While in Towson, Maryland he was responsible for computation and review of streamflow data. Mr. Gillen worked on several District projects that included time of travel studies, tidal measurements on the Potomac River, updating Maryland streamflow characteristics, acid rain studies, and nutrient flux programs in the Chesapeake Bay basin. He also served as an instructor for the Northeastern Region in the streamflow records computation program. He later served as an instructor in the same course in the Southeastern Region. He was a member of the Office of Surface Water review team. While in the Tampa Florida Sub-District, responsible for a data section unit and supervising technicians in their data collection and computation activities and advising on stream flow computations, rating analysis, station analysis, real-time data collection, and the collection of water quality data. He was a member of the Office of Surface Water review team and as such reviewed records for: Nebraska District, Michigan District, Oregon District, Iowa District, and the Wyoming District of the U.S. Geological Survey. He also served as a member of the Surface Water Instrument Advisory Committee studying the feasibility of electronic processing of discharge measurements. He conducted a final review on records worked prior to publication in the annual USGS water data reports. He also served in the Environmental Studies Section as project chief for the study of Manning's coefficients for West Central Florida streams and the Horse Creek basin characteristics study. After retiring from the US Geological Survey, Water Resources Division in 1996, he was primarily involved in the collection, processing and computation of stream flow and stage data for 25-30 sites throughout the Suwannee River Basin. In 1999, he led a team sent to measure discharge on the Agno River at the San Rogue Dam Project in the Philippines. Since joining Hydrologic Data Collection, Inc. he has primarily been involved in the computation of continuous records of streamflow for sites located throughout south Georgia and north Florida.

Raymond has conducted streamflow measurements and collected water quality samples under extreme hydrologic conditions for use in several USGS hydrologic investigations. He is very familiar with the wide variety of data loggers, pressure transducers, and water quality instrumentation used in the collection of hydrologic, water quality and meteorological data. Equipment familiarity includes graphic recorders, digital recorders, bubble gages, water-quality mini-monitors, Hydro-Lab and YSI multi sonde's, Sutron data loggers, CR- 10's, AVM's, DCP's, a variety of pressure transducers, ADCP's and acoustic velocity and discharge sensors. Conducts discharge measurements using Price AA current meters, the SonTek Flow Tracker and River Cat. He is responsible for the collection of stage, temperature, conductance and salinity data at two sites on the Little Manatee River as well as four sites where pH, dissolved oxygen, dissolved oxygen saturation, turbidity, temperature and conductance are monitored on a real time basis. Conducts discharge measurements, process and compute unit values of stage to discharge using developed stage-discharge ratings and stage shift diagrams. He reviews stage-discharge records computed and station analysis written by other members of the HDC staff. Measure 150 ground water wells in Starkey and Morris Bridge well fields. He has constructed many gauging stations under a variety of conditions. Assigned to the Tampa USGS Hydro-Geologic Studies Section, Ray was the Project Chief for the potentiometric surface of the Upper Floridan aquifer, and the potentiometric surfaces of the intermediate aquifer system, west-central Florida projects. The maps were produced semi-annually on a GIS base and published as an open-file report. He was also responsible for maintaining a network of about 600 wells consisting of private domestic and irrigation wells and state and federal monitor wells. Ray was project chief for the Hydrology of Four Reclaimed Clay-Settling Area Basins, Central Florida. Each clay-settling network required ground water and surface water data to be collected as well as climatologic data. Each network was established as required by the cooperator. He also was the project chief of the Hydrologic Investigation of the Phosphate-Mined Upper Saddle Creek Watershed, Central Florida. The network consisted of seven daily discharge sites, three miscellaneous discharge sites, and two continuous surficial groundwater monitor wells.

Among Larry's responsibilities during his years at the USGS, he planned and coordinated the operational activities of the Aiken, South Carolina, and field office. This field office was responsible for the collection and monthly reporting of data from 60 stations. He worked with representatives and contractors of the principal co- operator, the Department of Energy (DOE), to meet their needs in complying with EPA discharge and water quality permits on the Savannah River Site in Aiken, SC. The base line data was collected by a satellite telemetry system that enabled DOE to have real-time data to meet their needs. Monthly and annual reports were prepared from the records for the surface-water, quality-water and ground water stations. Larry has both knowledge and experience in the operation of gauging stations; making discharge measurements by weir wading, cable (bridge, cableway, boat using Price Meters or Acoustic Doppler). He has run levels to establish and check datum of stations and flood elevations; collected water-quality samples at surface-water and ground- water, including sediment, chemical, biological and bed material; collected data pertaining to quantity, quality and movement of ground water including the collection of well logs, seepage runs, pump tests and water level measurements. Larry is very capable in the preparation of reports and the review of data as compiled by others. His experience in the preparation of surface-water and ground water data for monthly and annual reporting is extensive. He is also experienced at giving demonstrations, training and lectures on the use, testing, and calibration of flow measuring equipment and water quality instrumentation.

After retiring from the Water Resources Division of the USGS in 1996, he was primarily involved in the collection of streamflow and stage data for 25-30 sites located throughout the Suwannee River Basin. In 1999, he was part of a team sent to measure discharge on the Agno River at the San Rogue Dam Project in the Philippines. Throughout his career as a Hydrologic Technician with the USGS, serviced and maintained all types of instrumentation including Handar real-time data collection units, Sutron and Cambell EDL's. He has installed and instrumented gauging stations at remote locations. Collected and analyzed water quality and ground water data as part of routine and project networks. Provided training to lower grade and inexperienced hydrologic technicians on proper USGS protocols for hydrologic data collection, processing of electronic and real-time data in USGS databases, and computation of surface water, groundwater, meteorological, and water quality records. He has made general technical data studies relating to analysis of surface, ground, and well water samples, interpreted the data collected as well as transferred the data to maps and computer storage for use in publications. Throughout his career as a Hydrologic Technician he has serviced and maintained all types of instrumentation including Handar real-time data collection units, Sutron and Cambell EDL's. Installed and instrumented gauging stations at remote locations. Collected and analyzed water quality and ground water data as part of routine and project networks. Provided training to lower grade and inexperienced hydrologic technicians on proper USGS protocols for hydrologic data collection, processing of electronic and real-time data in NWIS databases, and computation of surface water, ground water, meteorological, and water quality records.

Buddy has conducted streamflow measurements and collected water quality samples under routine and extreme hydrologic conditions. He conducts discharge measurements at weirs, by wading, from bridges or by boat. Buddy is very familiar with the wide variety of data loggers, pressure transducers, and water quality instrumentation used in the collection of hydrologic, water quality and meteorological data. He has constructed many gauging stations under a variety of conditions.

Dann has investigated and published reports on a wide variety of hydrologic topics including: (1) streamflow in hydrologic basins altered by phosphate mining; (2) statistically evaluating daily discharge from tidal and nontidal springs (3) mapping the regional and local potentiometric surfaces of the aquifers in Florida; (4) determining the seasonal and diurnal movement of the saltwater front in coastal rivers to detect changes in the salinity affecting the productivity of estuaries; (5) evaluating the water quantity and quality of first-order magnitude springs in Florida; (6) numerically simulating the effects of ground-water development in close proximity to the springs; (7) statistically evaluating water-quality trends in the major wellfield areas of Tampa Bay, and (8) numerically simulating optimal pumping from the major wellfields to preserve the ecosystems and supply the growing population of Florida. He employed the first electromagnetic velocity meter used in the USGS Tampa Sub-district Office to calculate discharge and developed statistics-based streamflow ratings to calculate daily discharge from springs. Dann served as ground-water specialist for the Florida District and participated in decisions affecting the ground-water program, office policy, plans, and operations. Responsibilities included proposing, recommending, and developing multi-disciplinary water resources investigations that describe, interpret, stimulate, or predict responses of the hydrologic systems of multi-county areas, regions, or of the State under natural, current, and man-induced conditions. Dann also completed 12 research projects during the 28 years with the USGS using state-of-the-art hydrologic tools and instruments, including: the use of PC's; ADCP instruments and computer software, the ground-water models MODFLOW, VISUAL MODFLOW, MODPORT, MODPATH, and ARGUS; the solute-transport models, HST3D and SUTRA; the rainfall runoff models HSPF and PMRS; the water-quality models, PHREEQE and WATEQ; the aquifer-test programs AQTESOLV and MODOPTIM; the statistical programs SAS, PSTAT, and STATMOST; the graphic and presentation programs COREL,ARCVIEW, ARCMAP, and FRAMEMAKER; the word processing and spreadsheet applications EXCEL, MSWORD, and FRAMEMAKER.

Kenny specializes in the development of discharge ratings and computation of stream flow at non-tidal and tidal gaging stations using USGS methods and standards. He worked for the USGS Water Resources Division (WRD) in Tampa and Tallahassee, FL. Kenny also worked for the USGS National Water Quality Assessment (NAWQA) program in Dover, DE. He has conducted stream flow measurements and collected water quality samples under routine and extreme hydrologic conditions. He conducts discharge measurements at weirs, by wading, from bridges or by boat. Kenny is very familiar with the wide variety of data loggers, pressure transducers, and water quality instrumentation used in the collection of hydrologic, water quality and meteorological data. He has constructed many gauging stations under a variety of conditions.