RAPPAHANNOCK RIVER BASIN 01666500 ROBINSON RIVER NEAR LOCUST DALE, VA LOCATION.--Lat 38 degrees 19'30", long 78 degrees 05'45", Madison County, Hydrologic Unit 02080103, on right bank 100 ft upstream from bridge on State Highway 614, 1.1 mi upstream from Great Run, 1.7 mi upstream from mouth, 2.0 mi southeast of Locust Dale, and 3.4 mi downstream from Crooked Run. DRAINAGE AREA.--179 mi2. PERIOD OF RECORD.--July 1943 to current year. Prior to October 1965, published as Robertson River near Locust Dale. REVISED RECORDS.--WSP 1171: 1948(M). WSP 2103: Drainage area. GAGE.--Water-stage recorder. Datum of gage is 283.70 ft above sea level. REMARKS.--Records good except those for periods with ice effect, Dec. 29-31, Jan. 6-17, and Feb. 4-9, 14-19, period of no gage-height record, May 5 to June 14, and period with backwater from debris, Sept. 9, which are fair. Maximum discharge, 25,400 ft3/s, from rating curve extended above 9,100 ft3/s on basis of contracted- opening measurement at gage height 20.17 ft. Several measurements of water temperature were made during the year. Water-quality records for some prior periods have been collected at this location. COOPERATION.--Records were provided by the Virginia Department of Environmental Quality - Water Division. EXTREMES OUTSIDE PERIOD OF RECORD.--Flood of Oct. 15, 1942, reached a stage of 23.9 ft, from floodmarks, discharge, about 44,000 ft3/s. EXTREMES FOR CURRENT YEAR.--Peak discharges equal to or greater than base discharge of 1,700 ft3/s and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft3/s) (ft) Date Time (ft3/s) (ft) Oct. 21 0730 4,880 13.57 June 11 Unknown 3,000 a10.74 Nov. 12 0300 2,230 8.89 Aug. 13 0430 2,200 8.83 Jan. 19 1530 10,800 17.44 Sep. 4 1630 5,390 14.00 Jan. 27 1300 3,470 11.77 Sep. 6 1830 *22,100 *b23.92 a From high-water mark in well. b Backwater from debris. Minimum discharge, 48 ft3/s, Oct. 3, 4. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1995 TO SEPTEMBER 1996 DAILY MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 54 183 303 159 427 280 698 253 e235 131 244 104 2 52 185 282 266 398 276 1080 218 e210 123 169 97 3 49 180 262 525 380 262 689 209 e195 131 181 95 4 49 171 249 301 e315 239 560 208 e188 120 158 2190 5 85 158 231 248 e250 243 473 e320 e184 115 143 1550 6 354 154 223 e205 e225 249 414 e365 e180 109 164 11400 7 141 163 219 e150 e245 276 377 e315 e172 104 144 7240 8 101 184 208 e170 e290 304 342 e350 e168 101 120 1780 9 82 159 219 e185 e350 258 320 e335 e200 126 124 e1050 10 74 151 221 e215 381 243 297 e320 e740 99 196 e710 11 70 206 193 e195 415 239 279 e315 e920 89 138 e980 12 67 1250 185 e220 383 237 266 e370 e1200 88 191 e610 13 63 578 149 e205 314 232 255 e285 e610 163 1170 e520 14 146 665 150 e190 e285 228 244 e250 e455 119 456 e470 15 192 738 152 e250 e260 226 242 e215 379 110 329 e370 16 105 448 256 e365 e240 224 396 e380 300 116 274 e335 17 85 369 255 e315 e230 219 294 e425 261 100 333 e540 18 78 324 217 341 e220 213 260 e370 284 95 225 378 19 75 297 499 6450 e215 327 253 e315 330 193 192 324 20 77 273 524 2110 319 683 243 e285 252 171 170 292 21 2340 262 318 891 549 471 236 e245 217 116 157 270 22 651 246 261 655 404 396 233 e230 194 195 149 316 23 401 234 228 545 384 352 218 e215 175 204 138 264 24 312 246 209 599 357 317 216 e195 170 138 150 239 25 258 232 195 583 322 296 204 e200 290 122 155 231 26 223 222 184 455 308 280 201 e210 174 116 125 215 27 208 216 172 1870 313 257 199 e230 154 99 164 214 28 292 213 174 998 340 475 186 e270 144 199 195 214 29 223 434 e155 699 300 609 184 e245 137 431 134 327 30 194 353 e145 580 --- 438 214 e260 138 763 123 241 31 180 --- e138 502 --- 398 --- e215 --- 256 111 --- TOTAL 7281 9494 7176 21442 9419 9747 10073 8618 9256 5042 6722 33566 MEAN 235 316 231 692 325 314 336 278 309 163 217 1119 MAX 2340 1250 524 6450 549 683 1080 425 1200 763 1170 11400 MIN 49 151 138 150 215 213 184 195 137 88 111 95 CFSM 1.31 1.77 1.29 3.86 1.81 1.76 1.88 1.55 1.72 .91 1.21 6.25 IN. 1.51 1.97 1.49 4.46 1.96 2.03 2.09 1.79 1.92 1.05 1.40 6.98 e Estimated. RAPPAHANNOCK RIVER BASIN 01666500 ROBINSON RIVER NEAR LOCUST DALE, VA--Continued STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1944 - 1996, BY WATER YEAR (WY) OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP MEAN 172 215 230 268 293 344 311 249 216 131 143 162 MAX 783 1350 624 752 704 980 989 625 1154 522 1063 1119 (WY) 1991 1986 1973 1978 1979 1993 1983 1989 1995 1949 1955 1996 MIN 18.5 35.1 32.0 47.5 105 105 89.3 70.9 35.7 21.3 12.2 8.05 (WY) 1964 1966 1966 1966 1977 1981 1981 1977 1977 1944 1963 1954 SUMMARY STATISTICS FOR 1995 CALENDAR YEAR FOR 1996 WATER YEAR WATER YEARS 1944 - 1996 ANNUAL TOTAL 104078 137836 ANNUAL MEAN 285 377 227 HIGHEST ANNUAL MEAN 445 1973 LOWEST ANNUAL MEAN 95.6 1981 HIGHEST DAILY MEAN 13200 Jun 27 11400 Sep 6 14700 Jun 22 1972 LOWEST DAILY MEAN 30 Sep 16 49 cOct 3 1.8 dSep 13 1954 ANNUAL SEVEN-DAY MINIMUM 35 Sep 10 85 Oct 7 3.0 Sep 7 1966 INSTANTANEOUS PEAK FLOW 22100 Sep 6 25400 Jun 27 1995 INSTANTANEOUS PEAK STAGE f23.92 Sep 6 f23.92 Sep 6 1996 INSTANTANEOUS LOW FLOW 48 cOct 3 1.2 gSep 7 1954 ANNUAL RUNOFF (CFSM) 1.59 2.10 1.27 ANNUAL RUNOFF (INCHES) 21.63 28.65 17.25 10 PERCENT EXCEEDS 384 565 427 50 PERCENT EXCEEDS 149 239 149 90 PERCENT EXCEEDS 59 120 41 c Also Oct. 4, 1995. d Also Sept. 27, 1954. f Backwater from debris. g Also Sept. 13, 1954.