SCIENTIFIC INVESTIGATIONS MAP 2009-3076 U.S. DEPARTMENT OF THE INTERIOR Prepared in cooperation with U.S. GEOLOGICAL SURVEY Bathymetry of Lake William C. Bowen and Municipal Reservoir #1, Spartanburg, , 2008 (ver. 1.1, March 2015) SPARTANBURG WATER SYSTEM, SPARTANBURG, SOUTH CAROLINA Nagle, D.D., Campbell, B.G., and Lowery, M.A., Bathymetry in Spartanburg County, 2008

Abstract Data-Collection Methodology Two historical maps of the lake and reservoir area that were constructed 82°8' 82°6' 82°4' 82°2' 82°0' 81°58' The increasing use and importance of lakes for water supply to communities Bathymetric data were collected by interfacing a 12-channel GPS receiver prior to impoundment were obtained from the National Archives and Records enhance the need for an accurate methodology to determine lake bathymetry and and data logger (Trimble™ Pro XL with TDC1 data logger running Asset Sur- Administration. However, both maps, dated 1907 and 1934, respectively, were storage capacity. A global positioning receiver and a fathometer were used to veyor™ firmware) to a dual-frequency fathometer. The fathometer was set to the at a scale of 1:125,000 and a contour interval of 100 ft and were not detailed

collect position data and water depth in February 2008 at Lake William C. Bowen 200-kilohertz (kHz) frequency because this signal produces greater detail and enough to be useable. Therefore, no comparisons were made to document areas 9 LAKE BOWEN VOLUME CURVE

and Municipal Reservoir #1, Spartanburg County, South Carolina. All collected resolution relative to the lower frequency of 50 kHz, which produces a wider of sediment deposition or estimate rates of sediment deposition. 816 Table 1. Measurement dates, water-surface elevations, and number of data points collected in Lake William C. Bowen and Municipal Reservoir #1, Spartanburg County, South Carolina. data were imported into a geographic information system database. A bathymetric signal and generally is used to transverse depths greater than 400 ft. The horizon- 35°8' Fingerville 814 812 [SC, South Carolina; ft, feet; elevations are relative to National Geodetic Vertical Datum of 1929; –, data not collected] surface model, contour map, and stage-area and -volume relations were created tal coordinates and times in which the signals were received were recorded by the N o Summary r 810 th Range of water-surface Number of bathymetric Range of water-surface Number of bathymetric from the geographic information database. data logger. The depth soundings from the fathometer also were time-tagged and 11 Pa 808 Date elevations for Lake points collected in Lake elevations for Municipal points collected in col et recorded to the data logger. These data were processed by using GPS mapping A bathymetric survey was conducted on Lake William C. Bowen and Munici- 02154500 River 806 Bowen, SC (ft) Bowen, SC Reservoir #1 (ft) Municipal Reservoir #1 02154950 Campobello B Dam 804 02-06-2008 815.16 – 815.17 3,287 – – software (Trimble™ Pathfinder Office 3.00). The horizontal coordinate infor- ow pal Reservoir #1, Spartanburg County, South Carolina, in February 2008. The . e Dam C n Introduction 802 02-07-2008 815.15 3,060 – – mation was differentially corrected from a dataset from another GPS receiver m survey was performed by using a dual-frequency fathometer to collect water ia 02155500 L ll Elevation, in feet above NGVD 29 02154790 ake Wi Municipal 800 02-08-2008 815.14 – 815.13 2,196 – – known as a base station. In this investigation, the closest base station used was a Pacolet depths and a mapping-grade GPS receiver mounted above the fathometer to Reservoir #1 798 Bathymetric surveys can be used to create maps of the lakebed and to com- 35°6' River 02-13-2008 815.17 – 815.18 2,754 – – continuously operating reference station (CORS) operated and maintained by the 200 400 600 800 1,000 1,200 pute water-level (stage) area and volume tables so that water-supply managers collect horizontal-position data. The accuracy of the vertical measurement National Geodetic Survey (NGS). Data processed this way, by using a GPS, can Volume, in million cubic feet 02-14-2008 815.14 821 – – can regulate the use of these valuable resources more reliably. Knowledge of obtained by echo sounding usually is rated by manufacturers at +/- 0.1 ft plus 02-14-2008 – – 777.88 2,282 be expected to achieve accuracies in the horizontal of 1 meter (m) (multiply by Figure 4. Stage-volume curve for Lake William C. Bowen, Spartanburg reservoir volume is particularly important for the management of water-supply 0.1 to 0.5 percent of the depth. The horizontal coordinates had an accuracy 02-15-2008 – – 777.94 1,698 3.281 to convert to feet) or less. Any horizontal coordinates that were found to County, South Carolina, February 2008. reservoirs during periods of drought or high-water use in the area supplied by of 1 m (multiply by 3.281 to convert to feet) or less. The results of the survey 02-28-2008 – – 777.56 782 be out of this tolerance were deleted from the dataset. The depth soundings were 26 the lake. These data also can be used to document areas of sediment deposition included area and volume curves and a bathymetric-contour map. assigned a horizontal coordinate by interpolating the time reading from both sets and changes in storage volume, and when compared to historical surveys, to of measurements. 35°4' estimate sediment-deposition rates. As part of an investigation to assess water- References Cited LAKE BOWEN STAGE-AREA CURVE quality conditions affecting taste and odor compounds in Lake William C. Bowen The travel time of the sound pulse from a fathometer is measured either elec- 816 814 and Municipal Reservoir #1 (fig. 1), the U.S. Geological Survey (USGS), in tronically in a depth digitizing device or mechanically (graphically) on an ana- EXPLANATION Environmental Modeling Systems, Inc., accessed on December 12, 2008, at Municipal Reservoir # 1 812 Table 2. Stage-area and stage-volume relations for selected log recording-type instrument. The accuracy of the absolute time measurement Inman watershed boundary cooperation with the Spartanburg Water System (SWS), collected bathymetric 810 elevations of Lake William C. Bowen, Spartanburg County, South http://www.aquaveo.com/gms USGS gaging station Boiling Springs generally varies with depth because of signal attenuation, noise, and the ability Carolina, February 2008. and shoreline data from these two reservoirs. 02154790 location and number 808 0 1 2 MILES of the measurement circuitry to correlate the outgoing and incoming pulses. In National Records and Archives Association, Quadrangle RG 57: Scale 125,000, 806 Elevation (feet, Volume (cubic 0 1 2 KILOMETERS Surface area (acres) 6 804 NGVD 29) feet x 10 ) Purpose and Scope addition, the acoustic reflectivity characteristics of the target (size, shape, ori- NC-Saluda (1907), and Quadrangle RG 57: Scale 125,000 NC-Saluda (1934). Base from U.S. Geological Survey 802 815.12 1,440 1,040 1:24,000-scale digital line graphs

entation, material, and so on) can significantly affect the returning pulse. Varia- Elevation, in feet above NGVD 29 Sibson, R., 1981, A brief description of natural neighbor interpolation, in Bar - Universal Transverse Mercator projection 800 814 1,400 970 The purpose of this report is to provide the SWS personnel with bathymet- tions in return-signal strength and sharpness will affect the depth measurement Zone 17 nett, V., ed., Interpreting multivariate data: New York, John Wiley & Sons, North American Datum of 1983 798 812 1,300 852 ric, stage-area, and stage-volume data that can be used to more effectively plan 600 700 800 900 1,000 1,100 1,200 1,300 1,400 1,500 accuracy. The irregularity of the reflected pulse causes uncertainty in the overall p. 21–36. 810 1,180 742 Figure 1. Lake William C. Bowen and Municipal Reservoir #1 in Spartanburg County, Spartanburg, South Carolina. Surface area, in acres and manage the water resources available for Spartanburg County. The USGS time-measurement process. There is no practical calibration process for mini- 808 1,100 643 Trimble Pathfinder Office™ mapping software accessed December 19, 2008, at conducted a bathymetric survey of Lake William C. Bowen and Municipal mizing this error. The accuracy of echo-sounding time measurement usually is Figure 5. Stage-area curve for Lake William C. Bowen, Spartanburg 806 979 551 http://trl.trimble.com/docushare/dsweb/Get/Document145149/13269O_ County, South Carolina, February 2008. Reservoir #1 during February 2008. The survey was conducted using a global rated by manufacturers at plus or minus (+/–) 0.1 ft plus 0.1 to 0.5 percent of 804 897 469 GPS%20Pathfinder%20Office_DS_1208_LR.pdf positioning system (GPS) receiver and data logger interfaced to a fathometer. the depth (U.S. Army Corps of Engineers, 2002). Depth readings were verified 802 768 394 The field data were differentially corrected and then transferred to groundwater periodically by using a steel tape measured to tenths of a foot. Trimble Pathfinder Pro-XL™ and TDC1 Data logger, accessed December 19, 800 698 391 modeling system (GMS) software and a geographic information system (GIS), 82°6' 82°4' 82°2' 82°0' Data were collected during February 2008. Transects were selected by plot- 2008, at http://weather.nmsu.edu/Teaching_Material/SOIL698/dinus/gps/ MUNICIPAL RESERVOIR #1 VOLUME CURVE which were used to map contour lines and determine stage-area and stage-volume ting them on a 1:24,000-scale USGS topographic map and using visual recogni- sld001.htm 778 curves. Since no previous bathymetric surveys exist for the study area, the results tion and line-of-sight landmarks (fig. 2). In this figure, while the transects are 776 U.S. Army Corps of Engineers, 2002, Engineering and design, hydrographic 774 9 of this investigation will be a valuable tool by which to compare future surveys shown as lines they are actually comprised as data points. 772 surveying, Manual No. 1110-2-1003, chapter 9, 46 p.; accessed on December 22, 770 to predict sedimentation rates, sediment distribution, and the longevity of the Turkey Creek Shoreline data were digitized from March 4, 2006, aerial photography, and 2008, at http://www.usace.army.mil/publications/eng-manuals/em1110-2- 768 two reservoirs. water-surface elevation data were monitored from USGS streamgaging station 1003/c-9.pdf 766 35°8' 764 Fingerville Table 3. Stage-area and stage-volume relations for selected Alexander Creek 02154950 in Lake William C. Bowen and from a staff gage in Municipal Res- 762 26

Elevation, in feet above NGVD 29 elevations of Municipal Reservoir #1, Spartanburg County, South Description of Study Area U.S. Geological Survey, 2008, Water-resources data for the United States, 760 ervoir #1 that was manually read in the morning and in the afternoon. Table 1 Carolina, February 2008. water year 2007: U.S. Geological Survey Water-Data Report WDR-US-2007, 10 20 30 40 50 60 70 80 90 100 110 120 summarizes the data-collection dates, range of surface-water elevations, and 11 Volume, in million cubic feet Elevation (feet, Volume (cubic Lake William C. Bowen is a manmade lake created in 1960 by the impound- Surface area (acres) accessed December 23, 2008, at http://wdr.water.usgs.gov/wy2007/search.jsp NGVD 29) feet x 106) number of data points collected in Lake William C. Bowen and Municipal Figure 6. Stage-volume curve for Municipal Reservoir #1, Spartanburg ment of the South Pacolet River (fig. 1). At full pool elevation of 815 feet (ft) 776.09 276 109 relative to National Geodetic Vertical Datum of 1929 (NGVD 29), Lake Reservoir #1. County, South Carolina, February 2008. Dam Dam 776 271 108 William C. Bowen is an impoundment of 1,530 acres with 33.0 miles (mi) of Any use of trade, product, or firm names is for descriptive purposes only and does not imply 774 228 85.5 endorsement by the U.S. Government. shoreline (J. Cann, Spartanburg Water System, oral commun., June 2007). 772 180 67.3 Data Analysis Municipal Reservoir #1 770 131 53.1 Water flows from Lake William C. Bowen downstream into a second Lake William 35°6' MUNICIPAL RESERVOIR #1 STAGE-AREA CURVE C. Bowen 768 104 42.7 impoundment, Municipal Reservoir #1, which was created in 1926 (fig. 1). At The differentially corrected data were exported to a spreadsheet. The lake 778 766 86 34.3 full pool elevation of 777 ft (NGVD 29), the lake surface of Municipal and reservoir levels that coincide with the date and time that the bathymetry data 776 764 72 27.4 Reservoir #1 covers 272 acres with 13.1 mi of shoreline (J. Cann, Spartan- were collected also were exported into the spreadsheet. The depths were then 774 772 762 62 21.5 burg Water System, oral commun., June 2007). Recreational activities are subtracted from the recorded water level so that all depths for the data-collection 770 allowed on Lake William C. Bowen but are restricted on Municipal Reservoir #1. period were based on a common datum. For the purposes of this report, all verti- 768 Outflow from Municipal Reservoir #1 is about 2,600 ft upstream from the conflu- cal data were referenced to NGVD 29. 766 ence of the South and North Pacolet Rivers. 764 A 2-ft contour interval map was produced for Lake William C. Bowen and Elevation, in feet above NGVD 29 762 The South Pacolet River watershed, which encompasses these lakes, drains Municipal Reservoir #1 using three-dimensional surface-mapping software 760 91.4 square miles (mi2) and is located in Spartanburg and eastern Greenville (Environmental Modeling Systems, Inc.; fig. 3). The point data collected in 35°4' EXPLANATION 50 100 150 200 250 300 Bathymetric data-collection Surface Area in acres Counties, South Carolina (SC; fig. 1). The entire watershed for Lake William C. the bathymetric surveys were interpolated using a geostatistical technique called 0 1 2 MILES point 0 1 2 KILOMETERS Figure 7. Stage-area curve for Municipal Reservoir #1, Spartanburg Bowen and Municipal Reservoir #1 lies within the Piedmont Physiographic natural neighbor interpolation (Sibson, 1981). Natural neighbor interpolation is County, South Carolina, February 2008.

Province. Flow in the South Pacolet River is measured at USGS gaging station based on the Thiessen polygon network of the scatter point set. Stage-volume Base from U.S. Geological Survey 1:24,000-scale digital line graphs 02154790 (South Pacolet River near Campobello, SC). This gaging station is and stage-area curves also were generated from this software (figs. 4–7; Universal Transverse Mercator projection Zone 17 located 1.1 mi upstream from Lake William C. Bowen and monitors a drainage tables 2, 3). The upper-most water-surface elevations of 815.12 ft and 776.09 ft, North American Datum of 1983 area of 55.4 mi 2. The average annual flow measured at station 02154790 for Lake Bowen and Municipal Reservoir #1, respectively, were the stages when Figure 2. Bathymetric data-collection points used to generate contours for Lake William C. Bowen and Municipal Reservoir #1 in Spartanburg 3 was 96.6 cubic feet per second (ft /s) for the period 1989–2007 (U.S. Geological the aerial photography was taken on March 6, 2006. County, Spartanburg, South Carolina. Survey, 2008).

82°7' 82°6' 82°5' 82°4' 82°3' 82°2' 82°1' 82°0' 81°59' 81°58'

AREA B l u e R i d g e SHOWN Spartanburg

SPARTANBURG GREENVILLE COUNTY COUNTY SOUTH CAROLINA P i e dm o n t

Coastal Plain GEORGIA 35°7' USGS gaging station 02154950 SC-9 Atlantic Ocean 800 SR-42-849 790

SR-42-37

800 760 760 750

780 770 26 Dam

800 750 740 760 760

SR-42-213 Extent of data collection and survey 750 800 n owe Dam B 780 . C

m ia ill W 790 810 e ak L

780

810 770 EXPLANATION

770 INDEX CONTOUR—Interval 10 feet. Datum NGVD 29

INTERMEDIATE CONTOUR—Interval 2 feet

SR-42-74 ROAD CROSSING LAKE AND ROAD NUMBER

02154950 35°6' USGS GAGING STATION AND NUMBER

Mud Creek Hydrography from 1:24,000-scale National Hydrography Dataset except 0 1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 FEET Lake Bowen and Municipal Reservoir shorelines which were digitized SR-42-212 from digital orthophotos captured on March 4, 2006

0 500 1,000 1,500 2,000 METERS Universal Transverse Mercator projection, Zone 17 North American Datum of 1983

SR-42-74

Figure 3. Bathymetry of Lake William C. Bowen and South Pacolet River Municipal Reservoir No. 1, Spartanburg County, South Carolina, February 2008.

Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government For sale by U.S. Geological Survey, Information Services, Box 25286, Federal Center, Denver, CO 80225, 1–888–ASK–USGS Digital files available at http://pubs.usgs.gov/sim/3076/. Bathymetry of Lake William C. Bowen and Municipal Reservoir #1, Spartanburg County, South Carolina, 2008 Suggested citation: Nagle, D.D., Campbell, B.G, and Lowery, M.A., 2009, Bathymetry of Lake William C. Bowen and Municipal Reservoir #1, Spartanburg County, South Carolina, 2008 (ver. 1.1, March 2015): U.S. Geological Survey Scientific Investigations Map 3076, 1 sheet, http://dx.doi.org/10.3133/sim3076. By D.D. Nagle, B.G. Campbell, and M.A. Lowery 2009