UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL SURVEY

Transcription

1 c UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL SURVEY t EFFECTS OF URBANIZATION ON THE MAGNITUDE AND FREQUENCY OF FLOODS ON SMALL STREAMS IN TENNESSEE - BASIC DATA REPORT NO. 2 Open-File Report Prepared in cooperation with the TENNESSEE DEPARTMENT OF TRANSPORTATION and THE U.S. DEPARTMENT OF TRANSPORTATION, FEDERAL HIGHWAY ADMINISTRATION

2 Report Documentation Page Form Approved OMB No Public reporting burden for the collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington VA Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to a penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. 1. REPORT DATE REPORT TYPE N/A 3. DATES COVERED - 4. TITLE AND SUBTITLE Effects of Urbanization of the Magnitude and Frequency of Floods on Small Streams in Tennessee - Basic Data Report NO. 2 5a. CONTRACT NUMBER 5b. GRANT NUMBER 5c. PROGRAM ELEMENT NUMBER 6. AUTHOR(S) 5d. PROJECT NUMBER 5e. TASK NUMBER 5f. WORK UNIT NUMBER 7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) U.S. Department of the Interior 1849 C Street, NW Washington, DC PERFORMING ORGANIZATION REPORT NUMBER 9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSOR/MONITOR S ACRONYM(S) 12. DISTRIBUTION/AVAILABILITY STATEMENT Approved for public release, distribution unlimited 13. SUPPLEMENTARY NOTES 14. ABSTRACT 15. SUBJECT TERMS 11. SPONSOR/MONITOR S REPORT NUMBER(S) 16. SECURITY CLASSIFICATION OF: 17. LIMITATION OF ABSTRACT SAR a. REPORT unclassified b. ABSTRACT unclassified c. THIS PAGE unclassified 18. NUMBER OF PAGES 27 19a. NAME OF RESPONSIBLE PERSON Standard Form 298 (Rev. 8-98) Prescribed by ANSI Std Z39-18

3 CONTENTS Page Introduction Explanation of data... Hydrologic data Illustrations 1. Map of Tennessee showing location of gaging stations iii

4 EFFECTS OF URBANIZATION ON THE MAGNITUDE AND FREQUENCY OF FLOODS ON SMALL STREAMS IN TENNESSEE - BASIC DATA REPORT NO. 2 by Clarence H. Robbins INTRODUCTION Engineers involved in bridge, culvert and highway design often find it necessary to know the magnitude and frequency of discharge from small streams where the drainage basin is urbanized. In order to develop an adequate method for determining the frequency of floods on small streams in Tennessee,where urbanization is a factor, a considerable amount of runoff data are needed. At present there is a scarcity of runoff data from urban areas in Tennessee except in large metropolitan areas. With this in mind the U.S. Geological Survey and the Tennessee Department of Transportation entered into a cooperative agreement in July 1977 to collect data on streams draining less than about 25 mi2 in municipalities with populations ranging between 5,000 and 100,000. The data collected under this project, in combination with urban runoff data collected in Memphis, Nashville and Knoxville, will give a full spectrum of runoff conditions likely to be experienced in Tennessee. A total of 22 sites have been instrumented across the State as shown in figure 1. Each of the four hydrologic areas as defined in the report i "Technique for Estimating Magnitude and Frequency of Floods in Tennessee," 1976, by Randolph and Gamble is represented. This report summarizes data collected at these 22 sites during the period July 1977, to June 1982, and is the second basic data report to be released during the term of this project. The data presented in this report supersedes data in Basic Data Report No. 1. 1

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6 After sufficient data have been collected and analyzed, the Geological Survey Rainfall- model will be calibrated using these data. Urban runoff data from similar studies in Memphis, Nashville, and Knoxville will be incorporated into the data base of this study for the flood frequency analysis. Regional flood-frequency equations for the 2-year through the loo-year recurrence interval floods for small streams in urbanized areas will be developed using the expanded data base. EXPLANATION OF DATA The data, tabulated for each site, are composed of pertinent basin characteristics and major flood above a predetermined discharge rate. Basin characteristics: The basin drainage area (D.A.) is shown in square miles. The principle stream length CL), in miles, is from the drainage divide to the gage and was measured from 7 i/2-minute topographic maps. The main channel slope (S), in feet per mile, is the difference in elevation at points 10 percent and 85 percent of the main channel length measured upstream from the gage and divided by 75 percent of the stream length. Pervious, impervious, non-effective impervious, and noncontributing area (in percent of total area> are measured from aerial photographs of each site. These four characteristics have not been determined for some of the sites presented in this report. : Column headings are self-explanatory. Rainfall data are not available for some flood. because of equipment malfunctions. In addition, rainfall distribution over the basin for some was such that no rainfall was recorded at the gage. The rainfall listed under the column heading Total accumulated rainfall is the total amount of rainfall associated with each runoff event. Only those with complete rainfall and discharge data will be used in the model calibrations. Data tabulated in this report are the best available at this time but should be considered provisional and subject to change, especially discharge values which are dependent on rating curve definition. 3

7 CUMBEKLAND RIVER BASIN Town Creek above Gallatin, TN Location. --Lat 36"24'17", long 86"25'36", Sumner County, 200 feet above culvert on U.S. Highway 3lE, 1.3 miles northeast of intersection of highway 109 and 31E in. Gallatin. Gage and history.-- Dual digital recorders with 5-minute punch intervals, housed in = separate shelters. Station established May 8, Basin characteristics.--d. A. = 2.25 mi2; L = 2.52 mi; S = 68.8 f t/mi; percent pervious = 97.66; percent impervious = 2.28; percent noneffective impervious = 0; percent noncontributing D. A. = 0. Remarks.--All peaks are listed. Stage-discharge relation is not defined at this time. (in> (in> (ft) (ft3/s> (in) (in> (ft> (ft3/s> 5/18/81 1 5/19/ / l/ / /10/ /16/ /15/ /21/ l/ 2/ l/ l/20/ l/23/ / / :

8 CUMBERLAND RIVER BASIN Town Creek at Gallatin, TN Location. --Lat 36"22'50", long 86"27'15", Sumner County, at bridge on Maple Street, 1.6 miles upstream from mouth. Gage and history.-- Dual digital recorders with 5minute punch intervals, housed in separate shelters. Station established October 28, Basin characteristics.--d. A. = 4.90 mi2; L = 5 mi; S =: 37.6 ft/mi; percent pervious = 90.36; percent impervious = 5.55; percent noneffective impervious = 3.79; percent noncontributing D. A. = Remarks.-- Peaks above 5.0 feet are listed. (in> (in) (ft> (ft3/s> (in) (in> (ft> (ft3/s) 12/ 5/ l/25/ /25/78 2 8/11/ g/11/ / 3/ / / 8/ l/ l/ l/20/ /12/ / /13/ / /17/ /20/ /28/ /18/ / l/ / 6/ /10/ , ,530 8/15/ l/ l/ 2/ , , , ,

9 CUMBERLAND RIVER BASIN McCrory Creek at Ironwood Drive, at Donelson, TN Location. --Lat 36"09'07", long 86"39'02", Davidson County, at bridge on Ironwood Drive, 1.3 miles southeast of intersection of U.S. Highway 70 (Lebanon Road) and Donelson Pike in Donelson. Gage and history.-- Dual digital recorders with 5-minute punch intervals, housed in separate shelters. Station established November 17, Basin characteristics.--d. A. = 7.31 mi2; L = 4.48 mi; S = 26.8 ft/mi; percent pervious = 92.93; percent impervious = 5.74; percent noneffective impervious = 0.30; percent noncontributing D. A. = 1. Remarks.-- Peaks above 3.0 feet are listed. (in) (in> (ft> (ft3/s) (in> (in> (ft) (ft3/s> g/27/76 10/30/76 3/ / / l/ /77 4/23/ /21/ / 5/77 l/ 8/78 l/25/78 3/14/ /21/ / 8/78 l/ l/79 1/ 7/79 l/20/79 l/21/ , , , , , / l/ / /12/ / / 4/ /25/ g/13/ g/21/ /28/ ll/ l/ /25/ /20/ /28/ /17/ /19/ /19/ / 6/ / 7/81 0 l/22/ / /17/ /18/ : , , , , , , i

10 CUMBERLAND RIVER BASIN Mill Creek tributary at Glenrose Avenue, at Woodbine, TN Location. --Lat 36"07'02", long 86"43'37", Davidson County, at culvert under Glenrose Avenue, 1.1 miles northeast of intersection of Nolensville Road and Thompson Lane in Woodbine, TN. Gage and history.--dual digital recorders with 5-minute punch intervals, housed in separate shelters. Station established February 9, Basin characteristics.--d. A. = 1.17 mi2; L = 1.61 mi; S = 78.5 ft/mi; percent pervious = 76.09; percent impervious = 22.81; percent noneffective impervious = 1.10; percent noncontributing D. A. = 0. Remarks.-- Peaks above 3.0 feet are listed. (in> (in> (ft) (ft3/s1 (in> (in) (ft> (ft3/s>. 9/27/ lo/ 6/ /24/ /25/ / / /13/ / / 8/ /25/ /13/ / / l/ /12/ / / 4/ /21/ l/ /26/ g/13/ : " a /28/ /25/79 1 3/20/ / /13/ /17/80 5 6/29/ /22/ /19/ /10/ /18/ / 4/ / 6/ /12/ /25/ / 6/ /17/ /27/ /17/ lO lO * Stage exceeds upper end of rating curve. 7

11 CUMBERLAND RIVER BASIN Pages Branch at Avondale, TN Location. --Lat , long , Davidson County, at culvert under Trinity Lane, 900 feet east of intersection of Interstate 65 and Trinity Lane at Avondale. Gage and history.-- Dual digital recorders with 5-minute punch intervals, housed in separate shelters. Station established February 11, Basin characteristics.--d. A. = 2.01 mi2; L = 2.27 mi; S =97.1 ft/mi; percent pervious = 84; percent impervious = 14.97; percent noneffective impervious = 0.96; percent noncontributing D. A. = 0. Remarks. --Peaks above 3.0 feet are listed. (in> (in) (ft> (ft3/s> (in> (in> (ft) (ft3/s> 10/30/ ll/ l/ /23/ /25/ /12/ /12/ /13/ /16/ :: /23/ lo/ 8/ Ol /20/ /29/ /24/ Ol / 4/ Ol / /13/80 0.Ol /17/ /19/ /17/ /22/ / ,200 3/30/ , / /19/ / ,160 6/ 6/ /10/ /31/ /12/ l/ l/ / / /30/ l/20/ l/ l/ /10/ l/16/ /12/ l/19/ / 3/ /15/ /17/ lO / /26/ g/13/ / g/21/ r k i 8

12 CUMBERLAND RIVER BASIN Cummings Branch at Lickton, TN Location. --Lat 36'18'25", long 86'48'00", Davidson County, on right downstream wingwall of bridge, on Shaw Road, 900 feet above confluence with Shaw Branch, 0.8 miles northeast of Lickton..> Gage and history.--dual digital recorders with S-minute punch intervals, housed in separate shelters. Station established December 1, Basin characteristics.--d. A. = 2.40 mi2; L = 2.71 mi; S = 71.4 ft/mi; percent pervious = 98.16; percent impervious = 1.84; percent noneffective impervious = 0; percent noncontributing D. A. = 0. Remarks.--Peaks above 2.6 feet are listed. Total Maxi- Total' Maxiaccumu- Date fall inten- Stage charge Date fall inten-' Stage charge (in> (in> (ft> (ft%> (in> (in> (ft> (ft3/s> 2/23/ /12/ /13/ / / 8/78 4 1J l/ J 2J /12/ J 3J /13/ lJ l/ /13/ /17/ ' l/al l/ 2/ l/ 3/ /16/ /17/ /26/ :os :

13 CUMBERLAND RIVER BASIN Richland Creek at Charlotte Avenue, at Nashville, TN Location. --Lat , long , Davidson County, at bridge on Charlotte Avenue, 0.8 miles south of McCann School, and 4.0 miles southwest of the State Capitol in Nashville. Gage and history.-- Dual digital recorders with S-minute punch intervals, housed in separate shelters. Station established July 27, Basin characteristics.--d. A. = 24.3 mi2 ; L = 7.90 mi; S = 33.0 f t/mi; percent pervious 68.89; percent impervious = 26.11; percent noneffective impervious = 4.76; percent noncontributing D. A. = Remarks.--Peaks above 4.0 feet are listed. Date rain- minute Di s- rain- minute Di s- fall inten- Stage charge Date fall inten- Stage charge (in> (in) (ft) (ft3/s> (in) (in) (ft> (ft3/s> 9/ 3/ /23/ /12/ /21/ l/29/ / 4/ / l/ 25/ / / l/20/ /23/ / l/ / /21/ l/23/ ll/ 25/ lO lO ,010 12/12/ , ,990 3/17/ ,580 3/20/ ,000 3/24/ /14/ ,200 5/17/ ,730 5/19/ ,220 5 /23/ ,420 6/29/ ,100 3/30/ ,790 5/19/ ,590 6/ 6/ ,370 6 /22/ / ,220 7/17/ , l/ ,150 I/ 3/ ,590 l/10/ , , /26/ / 7/ :32-20.Ol , , , , , , , , , , , , , , ,

14 CUMBERLAND RIVER BASIN Harpeth River tributary at Franklin, TN Location. --Lat 35"55'24", long 86"52'46", Williamson County, upstream from culvert on 11th Avenue and 0.7 mile above mouth. Gage and history.--dual digital recorders, with 5minute punch intervals, housed in separate shelters. Station established November 4, Basin characteristics.--d. A. = 1.81 mi2; L = 2.49 mi; S = 74.9 ft/mi; percent pervious = 88.2; percent impervious = 4.68; percent noneffective impervious = 6.96; percent noncontributing D. A. = Remarks.--Peaks above 3.5 feet listed. (in> (in> (ft> (ftvs> (in> (in> (ft> (ft3/s> 11/ 5/ /13/ / / 3/ / l/ l/ /25/ / l/ / /23/ /13/ /21/ /12/ /20/ /28/ /14/ /17/ /19/ /22/ / /30/81 2 l/ 2/ : l/23/ / /17/

15 CUMBERLAND RIVER BASIN Jones Creek tributary at Dickson, TN Location.--Lat 36"05'08", long 87"22'39", Dickson County, upstream from culvert at private drive, 0.3 mile northeast of intersection of U.S. Highway 70 bypass and State Highway 48. Gage and history.--dual digital recorders with 5minute punch intervals, housed in separate shelters. Station established April 7, Basin characteristics.--d. A. = 2.29 mi2; L = 1.98 mi; S = 68.9 ft/mi. Remarks.--Peaks above 4.0 feet listed. (in> \ (in> (ft> (ft3/s) (in> (in> (ft> (ft3/s> /13/ J 3J / / 7/ / l/ l/ l/ /12/ / / g/21/ l/ /13/ /13/ /20/ /17/ /29/ /12/ : lO /17/ /18/ /19/ / l/ / /10/ /17/ /25/ /27/ /30/81 0 l/23/ / /15/ Ol Ol. 18.Ol.Ol Ol i 12

16 TENNESSEE RIVER BASIN Richland Creek at Greeneville, TN Location. --Lat 36"08'33", long 82"49'27", Greene County, at sewage plant, 0.2 mile upstream from bridge on Old Asheville Highway, and at mile 6.3. Gage and history.-- Dual digital recorders with 5minute punch intervals, housed in separate shelters. Station established November 4, Basin characteristics.--d. A. = 3.48 mi2; L = 3.09 mi; S = 76.3 ft/mi; percent pervious = 78.44; percent impervious = 18.41; percent noneffective impervious = 3.13; percent noncontributing D. A. =.016. Remarks.--Peaks above 3.0 feet listed. (in> (in> (ft) (ft3/s) (in> (in> (ft> (ft3/s> ll/ 6/ L2/25/ / /14/ / 2/ g/22/ J 4J Ol /19/ J /19/ , /21/ g/30/ lO /21/ /23/ /16/ J 3/ /20/ /22/ /10/ g/24/ /18/ /20/ /28/81 1 6J 6/ J /81 1 8/16/ J g/15/ /27/ l/ 3/ l/ 4/ l/21/ /26/

17 TENNESSEE RIVER BASIN Turkey Creek at Morristown, TN Location.--Lat 36"14'09", long 83"17'51", Hamblen County, 300 feet downstream from South Outer St., and 1.1 mile upstream from mouth. Gage and history.--dual digital recorders with 5-minute punch intervals, housed in separate shelters. Station established December 9, Basin characteristics.--d. A. = 5.09 mi2; L = 4.16 mi; S = 53.8 ft/mi; percent pervious = 86.61; percent impervious = 7.09; percent noneffective impervious = 5.98; percent noncontributing D. A. = Remarks. --Peaks above 3.0 feet listed.. (in> (in> (ft> (ft3/s> (in> (in> (ft> (ft3/s> 12/ / 8/78 7/27/78 8/11/78 9/10/78 12/ / / l/ / / 8/80 3/21/ /80 7/ 4/80 7/21/ / l/ /11/80 8/19/80 8/20/ Ol /10/ /17/ /18/80 1 2/ l/ l/81 1 6/ 4/ /30/ l/ l/ 4/ oa la

18 TENNESSEE RIVER BASIN Pistol Creek at Alcoa, TN Location. --Lat 35"46'08", long 83'58'58", Blount County, about 150 feet upstream from Calderwood Ave., 7.6 miles upstream from mouth. Gage and history.-- Dual digital recorders with 5-minute punch intervals, housed in separate shelters. Station established January 4, Basin characteristics.--d. A. = 15.7 mi2; L = 8.27 mi; S = 25.8 ft/mi; percent pervious = 88.40; percent impervious = 6.51; percent noneffective impervious = 5.09; percent noncontributing D. A. = 0. Remarks.-- Peaks above 4.0 feet listed. (in) (in) (ft) (ft3/s) (in) (in> (ft> (ft3/s) 11 8/78 1 l/25/ l/26/78 0 5/ /12/ /16/ / 9/ l/20/ /15/ /20/ /21/ /29/ ll/ l/ l/ 8/80 0 l/22/ / 8/ Ol :29.39.Ol.09.lO /21/ /13/ /80 2 7/27/ g/17/ g/24/ / 2/ / / /23/ / / /27/ /28/ : , ,

19 TENNESSEE RIVER BASIN South Mouse Creek at Cleveland, TN Locat ion. --Lat , long , Bradley County, at bridge on 20th Street, 16.2 miles upstream from mouth. Gage and history.-- Dual digital recorders with 5-minute punch intervals, housed in separate shelters. Station established November 17, Basin characteristics.--d. A. = 7.31 mi2; L = 4 mi; S = 24.3 ft/mi. Remarks. --Peaks above 3.0 feet listed. rain- minute Di s- rain- minute Dis- (in> (in) (ft> (ft 3/s) (in> (in> (ft> (ft3/s> l/ 8/ l/25/ / 4/ l/ l/ l! 7/ l/20/79 1 2/ / 4/ / /12/ /26/ /21/ /23/ /13/ /21/ /28/ / / /21/ , g/28/ / /17/ /20/ /23/ /l l/ /lo/81 2 3/30/ /23/ /27/ / 7/ /16/ /20/ l/19/ /27/ / l/ / / /15/

20 TENNESSEE RIVER BASIN Tanyard Branch at Fayetteville, TN Location.--Lat 35"09'02", long 86"34'22", Lincoln County, upstream from West Cambell Street. Gage and history.--dual digital recorders with 5minute punch intervals, housed in separate shelters. Station established November 1, Basin characteristics.--d. A. = 0.47 mi2; L = 0.65 mi; S = 184 ft/mi. Remarks. --Peaks above 3.0 listed. Stage-discharge relation is not defined at this time. (in> (in> (ft> (ft3/s) (in> (in> (ft> (ft3/s> ll/ 5/ /14/ / /14/78 1 l/ l/ / /20/ /20/ /24/ /31/ l/21/ l/23/ /15/ /21/ : :

21 TENNESSEE RIVER BASIN Pleasant Run Creek at Pulaski, TN Location.-- Lat 35"11'47", long 87"01'52", Giles County, upstream from culvert under U.S. Highway 64 and 0.6 mile above mouth. Gage and history.--dual digital recorders with 5-minute punch intervals, housed in separate shelters. From November 11, 1977 to March 3, 1980, recorders were located on the left downstream wingwall. On March 3, 1980, recorders were relocated upstream from culvert. Basin characteristics.--d. A. = 1.29 mi2; L = 2.34 mi; S = 74.3 ft/mi. Remarks. --Peaks above 4.5 feet listed. Stage-discharge relation is not defined at this time. (in> (in> (ft> (ft3/s) (in) (in> (ft> (ft3/s> 11/29/ al /13/ /13/78 lo/ /14/ /10/ / l/79 9/21/79 ll/ l/ /17/80 3/20/80 3/24/ / 8/80 5/16/ " /29/80 1 7/ /27/ /11/ /18/ /27/ / l/81 2 3/ l/21/ l/23/ / /15/ /21/ : *Starting , peak given is for continuous recorder. given is from CSG. 18 Prior to 3/16/80, peak

22 TENNESSEE RIVER BASIN Grindstone Hollow Creek at Manchester, TN Location. --Lat 35"28'56", long 86"05'33", Coffee County, upstream from culvert at Oakdale Street and at river mile 0.6. Gage and history.-- Dual digital recorders with 5-minute punch interval, housed in separate shelter. Station established October 27, Basin characteristics.--d. A. = 2.11 mi2; L = 2.60 mi; S = 28.2 ft/mi. Remarks. --Peaks above 3.0 feet listed. lated 5- lated 5.- (in> (in) (ft) (ft3/s> (in> (in> (ft) (ft3/s> 11/21/ / /12/ l/ l/ l/ 7/ l/20/ l/21/ /25/ / / /12/ /25/ /23/ / 7/ / 8/ /17/ /20/ /28/ oa a/ 4/ l/ 3/ l/21/ lO l/23/

23 TENNESSEE RIVER BASIN Bailey Fork Creek tributary at Paris, TN Location. --Lat 36"18'17", long 88"17'39", Henry County, downstream from bridge on Wilson Street. Cage and history.--dual digital recorders with 5-minute punch intervals, housed in separate shelters. Station established February 17, Basin characteristics.--d. A. - 1 mi2; L = 2.34 mi; S = 57.1 ft/mi. Remarks.-- Peaks above 2.5 feet listed. (in> (in> (ft) (ft3/s) (in> (in> (ft> (ft3/s) / / l/ /11/ / / g/21/ ll/ 9/ /23/ l/11/ /13/ /16/ / /29/ :12.Ol " e5 184 * 'c * >k e * x" n 'k /27/80 11/17/80 2/ l/81 3/ 4/81 3/29/81 5/18/ /17/ *Prior to July 19, 1979, gage located 10 feet upstream from present site. 20

24 OBION RIVER BASIN South Pork Forked Deer River tributary at Jackson, TN Location. --Lat , long , Madison County, upstream from culvert at Farrar Street at Jackson and 20 feet east of intersection of Union Street., Gage and history.-- Dual digital recorders with 5-minute punch interval, housed in separate shelters. Station established December 2, Basin characteristics.--d. A. = 0.98 mi2; L = 1.64 mi; S = 54.9 ft/mi. Remarks. --Peaks above 6.5 feet listed. (in) (in> (ft) (ft3/s) (in> (in> (ft) (f&s> 3/13/ /24/ l/ /18/ /17/ / 3/ / / l/ /11/ / 3/ / /79 2 6/20/ /79 3 7/12/ g/13/ g/21/ ll! 9/ /20/ / 8/ /19/ /23/ I /22/ g/24/ /17/ /24/ /30/ / 6/ / 6/ /18/ a/28/ /17/ l/22/ l/31/

25 OBION RIVER BASIN Middle Fork Forked Deer River tributary at Humboldt, TN Locat ion. --Lat , long , Gibson County, upstream from culvert at Sixth Street. Gage and history.--dual digital recorders with 5-minute punch intervals, housed in separate shelters. Station established January 6, Basin characteristics.--d. A. = 2.12 mi2; L = 2.64 mi; S = 26.3 ft/mi. Remarks. --Peaks above 3.5 feet listed. (in) (in) (ft> (ft s/s> (in) (in) (ft> (ft3/s> l/ /13/78 51 l/ / /12/78 5/28/78 6/ 21/ 78 11/17/78 12/ 3/ /78 12/ /23/79 2/25/ 79 3/23/79 41 l/79 4/l l/79 7/ 8/79 7/12/79 10/31/79 12/13/79 12/23/79 3/20/ /19/ : /23/ / 3/80 11/17/80 5/30/81 61 h/81 6/l l/ /17/81 l/ 2/82 l/ 3182 l/20/82 2/ 8/ :

26 . HATCHIE RIVER BASIN Town Creek tributary at Covington, TN Location. --Lat , long , Tipton County, on left bank 550 feet downstream of Liberty Ave., and 125 feet west of U.S. Highway 51. Gape and history.-- Dual digital recorders with 5-minute punch intervals, housed in separate recorder shelters; Station established December 1, Basin characteristics.--d. A mi2; L = 1.70 mi; S = 42.7 ft mi. Remarks. --Peaks above 5.5 feet listed. Total Maxi- Total Maxi-., accumu- (in> (in) (ft> (ft3/s> (in) (in> (it> (ft3/s> 12/ 4/ l/ l/ /20/ /11/ / /17/ / 7/ / /31/ /24/ / l/79 5 4/11/ /21/ /25/ /12/ , /23/80 6/24/80 11/17/80 12/ 8/ /26/81 5/30/ / /20/ l/ 3/82 l/20/82 l/31/ : i , 23

27 MISSISSIPPI RIVER BASIN Cypress Creek at Memphis, TN Location. --Lat , long , Shelby County, at bridge on Broad Street. Gage and history.-- Dual digital recorders with 5-minute punch intervals, housed in separate shelters. Station established November 3, Basin characteristics.--d. A. = 4.97 mi2; L = 4.66 mi; S = 19.1 ft/mi. Remarks. --Peaks above 4.0 feet listed. Stage-discharge relation is not defined at this time.. Lated 5- lated 5- rain- minute Di s- rain- minute Dis- (in> (in> (ft> (ft3/s> (in> (in> (ft> (ft3/s) / /19/78 6/ /14/78 8/ 8/78 8/l O/78 8/29/ 78 12/31/ l/79 8/22/ l/ 6/80 l! 7/78 l/24/78 l! 25/ / /23/ /23/ /21/79 11/22/79 12/12/79 3/16/80 3/17/80 3/23/ lO :29.21.Ol 10 : lO /l l/ /17/80 9/23/80 10/17/80 10/27/80 1 l/17/80 3/29/ / 9/81 5/31/ /81 7/ /21/ /17/81 l/ 2182 l/20/82 l/ l/31/82 2/ 9/ /20/82 3/21/82 4/l

28 TENNESSEE RIVER BASIN South Fork Dobbs Branch at Chattanooga, TN Location. --Lat 35"00'36", long 85"17'34", Hamilton County, upstream from culvert at Clio Street at Chattanooga and 0.6 mile upstream from mouth. * t Gage and history.--dual digital recorders with 5-minute punch intervals, housed in separate shelters. Station established December 4, Basin characteristics.--d. A. = 1.12 mi2; L = 1.41 mi; S = ft/mi. Remarks.--Peaks above feet listed that are not affected by backwater from Chattanooga Creek. rain- minute Dis- rain- minute.dis- Date fall 'inten- Stage charge Date fall inten- Stage charge (in> (in> (ft> (ft3/s) (in> (in> (ft> (ft3/s> /17/80 3/21/80 4/13/ /23/80 2/10/ /23/81 5/10/81 5/19/ /31/ /16/81 7/24/ Ol l/21/ l/23/