11180825 SAN LORENZO CREEK ABOVE DON CASTRO RESERVOIR, NEAR CASTRO VALLEY, CA
LOCATION.-Lat 37°41'43", long 122°02'38", in San Lorenzo Grant, Alameda County, Hydrologic Unit 18050004, on right bank at Interstate Highway 580, 0.3
mi southeast of Independent School and 2.2 mi east of Castro Valley.
DRAINAGE AREA.-18.0 mi2.
PERIOD OF RECORD.-October 1980 to September 1994, October 1997 to September 1998.
GAGE.-Water-stage recorder. Elevation of gage is 260 ft above sea level, from topographic map. October 1980 to September 1994 at site 250 ft downstream at same
datum.
REMARKS.-Records good except for estimated daily discharges, which are fair. Some regulation of low flow by ponds upstream from station.
EXTREMES FOR PERIOD OF RECORD.-Maximum discharge, 3,890 ft3/s, Feb. 3, 1998, gage height, 15.48 ft; no flow for many days in some years.
EXTREMES FOR CURRENT YEAR.-Peak discharges greater than base discharge of 275 ft3/s, or maximum:
Discharge Gage height Discharge Gage height
Date Time (ft3/s) (ft) Date Time (ft3/s) (ft)
Jan. 12 1445 1,170 8.59 Feb. 3 0130 3,890 15.48
Jan. 15 1345 972 7.89 Feb. 14 0600 408 5.63
Jan. 18 1515 1,340 9.15 Feb. 21 1300 1,120 8.43
Jan. 29 0315 282 5.00 Mar. 13 0730 453 5.84
DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1997 TO SEPTEMBER 1998
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
1 e.15 .22 e4.4 1.3 37 30 22 6.2 6.5 2.6 1.1 .53
2 e.46 .19 e3.1 9.5 418 24 21 7.4 6.4 2.6 1.1 .54
3 e.18 .16 e2.6 5.2 1270 22 43 7.4 6.2 2.5 .97 .53
4 e.16 .16 e2.4 31 261 18 50 7.4 6.0 2.6 1.0 .55
5 e.14 .18 e2.9 8.6 144 21 25 11 6.0 2.5 .90 .54
6 e.17 .23 e2.7 e7.0 425 17 21 9.7 5.8 2.3 .88 .51
7 e.27 .24 e61 e6.6 438 16 19 9.0 6.2 2.2 .86 .49
8 e.50 .26 e18 e6.2 302 13 16 9.8 6.1 2.2 .89 .48
9 e1.9 .29 e5.5 e6.0 155 11 15 8.9 5.5 2.2 .85 .52
10 e.60 6.9 e3.6 e18 103 9.8 14 8.5 5.5 2.2 .84 .53
11 e.35 1.1 e2.5 75 69 8.8 13 8.3 5.3 2.2 .78 .50
12 e.25 .31 2.1 401 70 8.6 13 12 5.2 2.1 .75 .45
13 e.25 .48 1.9 79 48 99 42 8.7 4.9 1.7 .72 .45
14 e.20 .87 11 29 192 29 24 7.6 4.7 1.6 .75 .45
15 e.18 6.3 3.0 298 84 25 13 7.4 4.6 1.8 .79 .49
16 e.17 1.2 2.3 112 76 26 11 7.3 4.3 1.6 .80 .53
17 e.20 .34 2.1 45 60 23 11 7.2 4.1 1.6 .84 .46
18 e.20 .89 2.0 326 42 21 10 7.1 3.9 1.6 .89 .44
19 e.22 2.2 1.7 154 148 19 9.7 7.0 3.7 1.5 .85 .46
20 e.23 .40 1.7 60 65 18 9.3 6.9 3.7 1.3 .80 .45
21 .21 e.46 1.7 35 294 17 8.8 6.8 3.5 e1.5 .70 .45
22 .21 e.37 1.6 24 167 16 8.4 6.8 3.4 e1.6 .70 .45
23 .19 e.48 1.4 18 216 e46 8.3 6.8 2.9 e1.6 .62 .43
24 .17 e2.2 1.4 14 112 e75 8.0 7.0 2.9 e1.5 .60 .45
25 .15 e.62 1.4 12 81 e45 7.4 7.3 2.9 e1.4 .60 .46
26 .16 e26 1.3 11 61 e29 7.1 6.8 2.7 e1.2 .60 .52
27 .20 e1.8 1.3 13 47 30 6.3 9.9 2.7 e1.0 .61 .56
28 .21 e1.5 1.3 8.4 38 26 6.3 24 2.6 e1.1 .59 .57
29 .19 e.90 1.3 113 --- 22 6.1 8.8 2.5 e1.3 .59 .87
30 .22 e10 1.4 28 --- 21 5.7 6.8 2.5 1.3 .63 1.0
31 .22 --- 1.3 32 --- 31 --- 6.8 --- 1.2 .60 ---
TOTAL 8.91 67.25 151.9 1986.8 5423 817.2 474.4 262.6 133.2 55.6 24.20 15.66
MEAN .29 2.24 4.90 64.1 194 26.4 15.8 8.47 4.44 1.79 .78 .52
MAX 1.9 26 61 401 1270 99 50 24 6.5 2.6 1.1 1.0
MIN .14 .16 1.3 1.3 37 8.6 5.7 6.2 2.5 1.0 .59 .43
AC-FT 18 133 301 3940 10760 1620 941 521 264 110 48 31
e Estimated.
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1981 - 1998, BY WATER YEAR (WY)
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
MEAN .88 3.33 6.61 18.1 33.0 18.0 7.45 2.96 1.36 .51 .22 .21
MAX 2.20 16.6 30.1 79.3 194 90.7 42.3 13.0 4.44 2.05 .78 .53
(WY) 1992 1984 1984 1993 1998 1983 1982 1983 1998 1983 1998 1986
MIN .072 .12 .65 .16 .65 .47 .70 .19 .14 .023 .001 .000
(WY) 1989 1993 1990 1991 1989 1990 1990 1991 1990 1989 1988 1988
SUMMARY STATISTICS FOR 1998 WATER YEAR WATER YEARS 1981 - 1998
ANNUAL TOTAL 9420.72
ANNUAL MEAN 25.8 7.58
HIGHEST ANNUAL MEAN 25.8 1998
LOWEST ANNUAL MEAN .70 1989
HIGHEST DAILY MEAN 1270 Feb 3 1270 Feb 3 1998
LOWEST DAILY MEAN .14 Oct 5 .00 Aug 28 1981
ANNUAL SEVEN-DAY MINIMUM .18 Oct 23 .00 Sep 6 1981
INSTANTANEOUS PEAK FLOW 3890 Feb 3 3890 Feb 3 1998
INSTANTANEOUS PEAK STAGE 15.48 Feb 3 15.48 Feb 3 1998
ANNUAL RUNOFF (AC-FT) 18690 5490
10 PERCENT EXCEEDS 49 13
50 PERCENT EXCEEDS 3.1 .71
90 PERCENT EXCEEDS .33 .04
11180825 SAN LORENZO CREEK ABOVE DON CASTRO RESERVOIR, NEAR CASTRO VALLEY, CA-Continued
WATER-QUALITY RECORDS
PERIOD OF RECORD.-December 1980 to September 1994, October 1997 to September 1998, (storm season only).
WATER TEMPERATURE: December 1980 to September 1994, October 1997 to September 1998.
SEDIMENT DATA: December 1980 to September 1994, October 1997 to September 1998.
PERIOD OF DAILY RECORD.-
WATER TEMPERATURE: December 1980 to September 1994, October 1997 to September 1998.
SUSPENDED-SEDIMENT DISCHARGE: December 1980 to September 1994, October 1997 to September 1998.
REMARKS.-Sediment samples were collected on most days where water temperature is published. Zero-bedload discharge observed for flows less than 29.0
ft3/s.
EXTREMES FOR PERIOD OF RECORD.-
SEDIMENT CONCENTRATION (storm season only): Maximum daily mean, 15,300 mg/L, Feb. 3, 1998; minimum daily mean, 0 mg/L, Feb. 26, 1989.
SEDIMENT LOAD (storm season only): Miximum daily, 80,900 tons, Feb. 3, 1998; minimum daily, 0 ton several days in most years.
EXTREMES FOR CURRENT YEAR.-
SEDIMENT CONCENTRATION (storm season only): Maximum daily mean, 15,300 mg/L, Feb. 3; minimum daily mean, 23 mg/L, Oct. 5.
SEDIMENT LOAD (storm season only): Maximum daily, 80,900 tons, Feb. 3; minimum daily, 0.01 tons several days.
PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT, WATER YEAR OCTOBER 1997 TO SEPTEMBER 1998
DIS- SEDI- SED. SED. SED.
CHARGE, MENT, SUSP. SUSP. SUSP.
INST. SEDI- DIS- FALL FALL FALL
CUBIC TEMPER- MENT, CHARGE, DIAM. DIAM. DIAM.
FEET ATURE SUS- SUS- % FINER % FINER % FINER
DATE TIME PER WATER PENDED PENDED THAN THAN THAN
SECOND (DEG C) (MG/L) (T/DAY) .002 MM .004 MM .008 MM
(00061) (00010) (80154) (80155) (70337) (70338) (70339)
NOV
22... 1345 .37 10.5 27 .03 -- -- --
26... 2350 23 12.0 351 22 -- -- --
DEC
07... 1525 58 13.0 6560 1030 60 70 83
10... 1510 2.8 9.0 68 .51 -- -- --
15... 0035 4.0 10.5 120 1.3 -- -- --
JAN
02... 1055 5.7 10.5 237 3.6 -- -- --
10... 1250 19 10.0 214 11 -- -- --
15... 1610 597 -- 8690 14000 29 33 40
18... 1530 1330 12.0 19000 68300 -- -- --
FEB
02... 1545 1250 12.0 20600 69500 -- -- --
05... 1735 117 12.0 1820 575 30 31 39
08... 1355 501 10.5 7630 10300 -- -- --
MAR
13... 1855 41 13.0 866 96 -- -- --
26... 1545 29 13.0 272 22 -- -- --
APR
30... 2350 5.5 15.0 93 1.4 -- -- --
MAY
02... 1025 8.1 13.0 60 1.3 -- -- --
PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT, WATER YEAR OCTOBER 1997 TO SEPTEMBER 1998
SED. SED. SED. SED. SED. SED. SED.
SUSP. SUSP. SUSP. SUSP. SUSP. SUSP. SUSP.
FALL FALL SIEVE SIEVE SIEVE SIEVE SIEVE
DIAM. DIAM. DIAM. DIAM. DIAM. DIAM. DIAM.
% FINER % FINER % FINER % FINER % FINER % FINER % FINER
DATE THAN THAN THAN THAN THAN THAN THAN
.016 MM .031 MM .062 MM .125 MM .250 MM .500 MM 1.00 MM
(70340) (70341) (70331) (70332) (70333) (70334) (70335)
NOV
22... -- -- 36 -- -- -- --
26... -- -- 97 99 100 -- --
DEC
07... 92 95 97 99 100 -- --
10... -- -- 74 -- -- -- --
15... -- -- 98 99 100 -- --
JAN
02... -- -- 99 100 -- -- --
10... -- -- 91 -- -- -- --
15... 52 62 71 84 94 99 100
18... -- -- -- -- -- -- --
FEB
02... -- -- -- -- -- -- --
05... 53 64 75 81 92 99 100
08... -- -- -- -- -- -- --
MAR
13... -- -- 81 88 95 99 100
26... -- -- 95 98 99 100 --
APR
30... -- -- 66 -- -- -- --
MAY
02... -- -- 66 -- -- -- --
PARTICLE-SIZE DISTRIBUTION OF SURFACE BED MATERIAL, WATER YEAR OCTOBER 1997 TO SEPTEMBER 1998
DIS- BED BED BED
NUMBER CHARGE, MAT. MAT. MAT.
OF INST. SIEVE SIEVE SIEVE
SAM- CUBIC TEMPER- DIAM. DIAM. DIAM.
PLING FEET ATURE % FINER % FINER % FINER
DATE TIME POINTS PER WATER THAN THAN THAN
(COUNT) SECOND (DEG C) .062 MM .125 MM .250 MM
(00063) (00061) (00010) (80164) (80165) (80166)
DEC
10... 1515 1 2.3 9.0 21 41 56
10... 1520 1 2.3 9.0 19 37 55
10... 1525 1 2.3 9.0 1 2 8
10... 1530 1 2.3 9.0 1 4 17
10... 1535 1 2.3 9.0 19 48 76
MAY
02... 1045 1 8.1 13.0 11 20 30
02... 1050 1 8.1 13.0 26 40 51
02... 1055 1 7.9 13.0 1 3 6
02... 1100 1 7.8 13.0 14 36 71
02... 1105 1 7.8 13.0 20 52 80
02... 1115 1 7.8 13.0 6 34 83
02... 1120 1 7.8 13.0 13 23 34
PARTICLE-SIZE DISTRIBUTION OF SURFACE BED MATERIAL, WATER YEAR OCTOBER 1997 TO SEPTEMBER 1998
BED BED BED BED BED BED BED
MAT. MAT. MAT. MAT. MAT. MAT. MAT.
SIEVE SIEVE SIEVE SIEVE SIEVE SIEVE SIEVE
DIAM. DIAM. DIAM. DIAM. DIAM. DIAM. DIAM.
% FINER % FINER % FINER % FINER % FINER % FINER % FINER
DATE THAN THAN THAN THAN THAN THAN THAN
.500 MM 1.00 MM 2.00 MM 4.00 MM 8.00 MM 16.0 MM 32.0 MM
(80167) (80168) (80169) (80170) (80171) (80172) (80173)
DEC
10... 65 76 86 97 100 -- --
10... 64 71 82 95 100 -- --
10... 16 23 32 42 52 67 100
10... 36 47 57 66 78 92 100
10... 88 93 96 100 -- -- --
MAY
02... 39 48 56 67 80 89 100
02... 62 70 79 87 93 97 100
02... 9 10 15 25 40 59 100
02... 84 88 92 98 100 -- --
02... 92 98 100 -- -- -- --
02... 92 96 98 100 -- -- --
02... 99 100 -- -- -- -- --
02... 45 57 71 90 100 -- --
PARTICLE-SIZE DISTRIBUTION OF BEDLOAD, WATER YEAR OCTOBER 1997 TO SEPTEMBER 1998
TIME HORI-
BAG TETHER ON BED ZONTAL
MESH LINE START- END- FOR WIDTH
SAM- SIZE USED IN ING ING BED OF
PLING SAMPLER BEDLOAD SAMPLNG TIME TIME LOAD VER-
DATE TIME METHOD, TYPE SAMPLER (YES=1) (2400 (2400 SAMPLE TICAL
CODES (CODE) (MM) (CODE) HOURS) HOURS (SEC) (FEET)
(82398) (84164) (30333) (04117) (82073) (82074) (04120) (04121)
JAN
15... 1720 1000 1100 .25 0 1710 1730 10 2
FEB
05... 1745 1000 1120 .25 0 1740 1750 10 1
COMPSTD VER- SAMPLE DIS- DISCH, SEDI-
SAMPLES TICALS NUMBER LOC- CHARGE, BEDLOAD MENT
IN IN OF ATION, INST. AV UNIT DIS-
X-SEC COM- SAM- CROSS CUBIC TEMPER- FOR COM CHARGE,
BEDLOAD POSITE PLING SECTION FEET ATURE POSITE BEDLOAD
DATE MEASMNT SAMPLE POINTS (FT FM PER WATER SAMPLE (TONS/
(NUM) (NUM) (COUNT) L BANK) SECOND (DEG C) T/D/FT DAY)
(04118) (04119) (00063) (00009) (00061) (00010) (04122) (80225)
JAN
15... 1 13 13 2 493 -- .18 5.2
FEB
05... 1 21 21 1 118 12.0 .92 21
SED. SED. SED. SED. SED. SED. SED. SED.
BEDLOAD BEDLOAD BEDLOAD BEDLOAD BEDLOAD BEDLOAD BEDLOAD BEDLOAD
SIEVE SIEVE SIEVE SIEVE SIEVE SIEVE SIEVE SIEVE
DIAM. DIAM. DIAM. DIAM. DIAM. DIAM. DIAM. DIAM.
% FINER % FINER % FINER % FINER % FINER % FINER % FINER % FINER
DATE THAN THAN THAN THAN THAN THAN THAN THAN
.062 MM .125 MM .250 MM .500 MM 1.00 MM 2.00 MM 4.00 MM 8.00 MM
(80226) (80227) (80228) (80229) (80230) (80231) (80232) (80233)
JAN
15... -- 3 34 80 92 96 97 100
FEB
05... 1 2 26 95 98 99 100 --
TEMPERATURE, WATER (DEG. C), WATER YEAR OCTOBER 1997 TO SEPTEMBER 1998
DAILY INSTANTANEOUS VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
1 --- --- --- --- --- --- --- --- --- --- --- ---
2 --- --- --- 10.5 12.0 --- --- 13.0 --- --- --- ---
3 --- 13.0 11.5 --- 12.0 --- --- --- --- --- --- ---
4 --- --- --- --- --- --- --- --- --- --- --- ---
5 --- 13.0 --- --- 12.0 --- --- --- --- --- --- ---
6 --- --- --- 7.5 11.5 --- 12.5 --- --- --- --- ---
7 --- --- 13.0 --- 12.0 --- --- --- --- --- --- ---
8 --- --- --- 9.0 10.5 --- --- --- --- --- --- ---
9 --- --- --- --- --- --- --- --- --- --- --- ---
10 --- --- 9.0 10.0 --- --- --- --- --- --- --- ---
11 --- --- --- --- 13.0 --- --- --- --- --- --- ---
12 --- --- --- 11.0 --- --- --- --- --- --- --- ---
13 --- --- --- 10.5 13.0 13.0 --- --- --- --- --- ---
14 --- --- --- 11.0 11.0 --- --- --- --- --- --- ---
15 --- --- 10.5 --- --- --- 12.5 --- --- --- --- ---
16 --- --- --- --- --- --- --- --- --- --- --- 17.0
17 --- --- 12.0 13.0 --- --- --- --- --- --- --- ---
18 --- --- --- 12.0 --- --- --- --- --- --- --- ---
19 --- --- --- --- --- --- --- --- --- --- --- ---
20 12.5 --- --- 10.5 --- --- --- --- --- --- --- ---
21 --- --- --- --- --- 14.5 --- --- --- --- --- ---
22 --- 10.5 --- --- --- --- --- --- --- --- --- ---
23 --- --- --- 11.5 --- --- 14.5 --- --- --- --- ---
24 --- --- --- --- --- 15.5 --- --- --- --- --- ---
25 --- --- --- --- --- --- --- --- --- --- --- ---
26 --- 12.0 --- --- --- 13.0 --- --- 17.5 --- --- ---
27 --- 13.0 --- --- --- --- --- --- --- --- --- ---
28 --- --- --- --- --- --- --- --- --- --- --- ---
29 --- 12.5 --- 11.0 --- 9.5 --- --- --- --- --- ---
30 --- 12.5 --- --- --- --- 15.0 --- --- --- --- ---
31 --- --- 9.0 12.5 --- --- --- --- --- --- --- ---
SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1997 TO SEPTEMBER 1998
MEAN MEAN MEAN
MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT
DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE
DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY)
OCTOBER NOVEMBER DECEMBER
1 e.15 24 .01 .22 36 .02 e4.4 170 2.02
2 e.46 67 .08 .19 35 .02 e3.1 150 1.26
3 e.18 28 .01 .16 33 .01 e2.6 56 .39
4 e.16 26 .01 .16 32 .01 e2.4 52 .34
5 e.14 23 .01 .18 34 .02 e2.9 60 .47
6 e.17 27 .01 .23 37 .02 e2.7 57 .42
7 e.27 41 .03 .24 39 .03 e61 1430 236
8 e.50 70 .09 .26 42 .03 e18 460 22.4
9 e1.9 205 1.05 .29 42 .03 e5.5 150 2.23
10 e.60 82 .13 6.9 207 4.7 e3.6 88 .86
11 e.35 56 .05 1.1 84 .39 e2.5 63 .42
12 e.25 39 .03 .31 27 .02 2.1 54 .31
13 e.25 38 .02 .48 42 .06 1.9 48 .24
14 e.20 33 .02 .87 74 .27 11 254 9.6
15 e.18 30 .01 6.3 289 19 3.0 93 .76
16 e.17 28 .01 1.2 69 .37 2.3 83 .52
17 e.20 33 .02 .34 32 .03 2.1 76 .43
18 e.20 33 .02 .89 58 .40 2.0 70 .38
19 e.22 35 .02 2.2 118 1.1 1.7 66 .31
20 e.23 36 .02 .40 31 .03 1.7 63 .29
21 .21 33 .02 e.46 31 .04 1.7 59 .27
22 .21 32 .02 e.37 27 .03 1.6 56 .24
23 .19 28 .01 e.48 32 .04 1.4 53 .20
24 .17 26 .01 e2.2 120 .71 1.4 50 .19
25 .15 24 .01 e.62 40 .07 1.4 48 .18
26 .16 26 .01 e26 846 59.4 1.3 45 .16
27 .20 34 .02 e1.8 170 .83 1.3 43 .15
28 .21 46 .03 e1.5 155 .63 1.3 40 .14
29 .19 38 .02 e.90 66 .16 1.3 37 .13
30 .22 37 .02 e10 354 9.56 1.4 33 .12
31 .22 36 .02 --- --- --- 1.3 31 .11
TOTAL 8.91 --- 1.84 67.25 --- 98.03 151.9 --- 281.54
e Estimated.
SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1997 TO SEPTEMBER 1998
MEAN MEAN MEAN
MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT
DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE
DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY)
JANUARY FEBRUARY MARCH
1 1.3 32 .11 37 457 51 30 751 60
2 9.5 308 12 418 5150 13800 24 646 42
3 5.2 227 5.8 1270 15300 80900 22 573 34
4 31 386 70 261 3500 2710 18 474 23
5 8.6 31 .73 144 2160 874 21 563 34
6 e7.0 24 .45 425 5230 7500 17 458 22
7 e6.6 27 .48 438 5450 6980 16 399 17
8 e6.2 30 .50 302 4350 3800 13 340 12
9 e6.0 28 .45 155 2050 882 11 291 8.6
10 e18 200 9.72 103 1220 347 9.8 270 7.2
11 75 744 302 69 757 143 8.8 239 5.7
12 401 5020 7510 70 1060 215 8.6 232 5.4
13 79 1570 395 48 950 123 99 1750 870
14 29 614 50 192 4190 2570 29 558 43
15 298 3980 5840 84 3070 698 25 509 35
16 112 979 340 76 2780 577 26 538 38
17 45 323 42 60 1690 279 23 447 28
18 326 3620 8540 42 1010 117 21 371 21
19 154 1510 704 148 3540 2700 19 308 16
20 60 442 75 65 1740 310 18 256 13
21 35 204 20 294 5440 7730 17 213 9.9
22 24 165 11 167 3680 1680 16 183 7.8
23 18 158 7.7 216 4120 3300 e46 300 37.3
24 14 137 5.2 112 2360 718 e75 555 112
25 12 110 3.4 81 1770 387 e45 401 48.7
26 11 103 3.3 61 1330 219 e29 270 21.1
27 13 150 5.8 47 1060 134 30 274 24
28 8.4 75 1.7 38 893 92 26 256 18
29 113 1430 630 --- --- --- 22 191 11
30 28 350 26 --- --- --- 21 148 8.5
31 32 397 36 --- --- --- 31 274 25
TOTAL 1986.8 --- 24648.34 5423 --- 139836 817.2 --- 1658.2
e Estimated.
SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1997 TO SEPTEMBER 1998
MEAN
MEAN CONCEN- SEDIMENT
DISCHARGE TRATION DISCHARGE
DAY (CFS) (MG/L) (TONS/DAY)
APRIL
1 22 210 13
2 21 177 10
3 43 394 68
4 50 582 110
5 25 309 21
6 21 243 14
7 19 214 11
8 16 192 8.4
9 15 178 7.1
10 14 165 6.0
11 13 153 5.3
12 13 158 6.2
13 42 699 106
14 24 577 48
15 13 343 12
16 11 272 8.2
17 11 231 6.6
18 10 196 5.4
19 9.7 167 4.4
20 9.3 141 3.6
21 8.8 120 2.9
22 8.4 102 2.3
23 8.3 87 1.9
24 8.0 76 1.6
25 7.4 67 1.4
26 7.1 60 1.2
27 6.3 57 .97
28 6.3 69 1.2
29 6.1 56 .92
30 5.7 45 .69
31 --- --- ---
TOTAL 474.4 --- 489.28
PERIOD 8929.46 167013.23
SUMMARY OF WATER AND SEDIMENT DISCHARGE, WATER YEAR OCTOBER 1997 TO SEPTEMBER 1998
WATER SUSPENDED BEDLOAD TOTAL
MONTH DISCHARGE SEDIMENT DISCHARGE SEDIMENT
DISCHARGE DISCHARGE
CFS-DAYS TONS TONS TONS
OCTOBER 1997 8.91 1.84 0 2
NOVEMBER .... 67.25 98.03 27 125
DECEMBER .... 151.90 281.54 52 334
JANUARY 1998 1986.80 24648.34 75 24700
FEBRUARY .... 5423.00 139836.00 707 141000
MARCH ....... 817.20 1658.20 22 1680
APRIL ....... 474.40 489.28 9 498
PERIOD ...... 8929.46 167013.23 892 168339