U. S. Army Corps of Engineers Wilmington District Annual Report of Reservoir Regulation Activities For Fiscal Year 1999 Coastal, Hydrology and Hydraulics Section



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NOTE: Rainfall and runoff amounts are watershed averages. Inflow is adjusted for storage changes at Smith Mountain, Leesville and Philpott projects upstream.

TABLE 2

SUMMARY OF RESERVOIR CONDITIONS AND PERFORMANCE

FOR FISCAL YEAR 1999

WILMINGTON DISTRICT










OCT

NOV

DEC

JAN

FEB

MAR

APR

MAY

JUN

JUL

AUG

SEP

YEARLY

PHILPOTT LAKE
















ROANOKE RIVER BASIN (CONT.)



































































INFLOW (c.f.s.)











































Period of record avg.











































(Sep 1929 - Dec 1993)




240

242

265

302

346

405

407

312

262

227

211

221

286

Fiscal Year 1999




76

70

124

226

190

191

166

167

56

77

30

168

128

















































OUTFLOW (c.f.s.)











































Maximum daily




249

254

201

195

138

202

338

246

251

307

490

491

491

Minimum daily




33

33

29

29

29

25

28

30

30

29

30

32

25

















































RAINFALL (inches*)











































Period of record normal











































(Sep 1929 – Dec 1993)




4.13

3.48

3.61

3.68

3.51

4.61

4.12

4.68

4.67

5.22

4.68

4.74

51.13

Fiscal Year 1999




2.66

1.45

3.93

4.53

2.29

3.07

2.65

3.06

1.58

5.84

3.46

7.85

42.37

















































RUNOFF (inches*)











































Period of record normal











































(Sep 1929 – Dec 1993)




1.31

1.27

1.44

1.64

1.70

2.20

2.14

1.70

1.38

1.23

1.15

1.16

18.02

Fiscal Year 1999




0.41

0.37

0.67

1.23

0.93

1.04

0.87

0.91

0.29

0.42

0.16

0.88

8.18

















































RESERVOIR ELEVATIONS (feet, m.s.l.)








































End of month




966.11

964.26

963.53

966.31

968.06

969.77

970.00

971.06

968.18

964.86

957.68

957.41

--- ---

Guide curve at end of month

971.50

971.50

971.50

971.50

972.50

973.50

973.50

973.50

973.50

973.50

972.50

971.50

--- ---

Maximum elevation




967.72

966.14

964.27

966.31

968.06

969.81

970.32

971.28

971.07

968.21

964.87

957.68

971.28

Minimum elevation




966.08

964.22

963.50

963.41

966.28

967.99

969.77

969.99

968.18

964.83

957.68

955.68

955.68

















































GROSS GENERATION (MWH)








































Period of record avg.











































(Sep 1953 – Dec 1993)




1929.68

1728.36

1950.26

2238.81

1915.94

2631.91

3003.77

2615.28

2218.43

1970.67

2000.34

1979.72

26183.17

Fiscal Year 1999




1220.89

1214.82

1268.14

847.14

789.56

914.44

1249.11

1011.12

1559.27

1845.27

2575.74

1356.75

15852.24

Maximum daily




67.81

68.29

53.46

51.39

36.81

55.16

94.53

68.26

69.58

83.03

126.52

125.66

126.52

Maximum hour




15.39

15.68

15.41

15.38

15.20

16.32

16.17

15.75

15.81

15.95

15.27

15.07

16.32

















































FLOOD STORAGE UTILIZED (%)

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

















































FISCAL YEAR BENEFITS











































Flood Control

$0







Headwater

$18,750




































Water Supply

$0

























NOTE: Rainfall and runoff amounts are watershed averages

TABLE 3

SUMMARY OF RESERVOIR CONDITIONS AND PERFORMANCE

FOR FISCAL YEAR 1999

WILMINGTON DISTRICT










OCT

NOV

DEC

JAN

FEB

MAR

APR

MAY

JUN

JUL

AUG

SEP



































































ROANOKE RIVER BASIN (CONT.)





























































SMITH MOUNTAIN LAKE








































Reservoir elevation








































at end of month








































(feet,m.s.l.)







790.90

790.00

790.50

793.20

794.40

794.30

794.30

792.86

791.90

791.40

791.70

794.40














































LEESVILLE LAKE








































Reservoir elevation








































at end of month








































(feet,m.s.l.)







605.03

604.80

603.10

600.50

600.50

605.90

604.40

604.86

605.30

608.76

603.40

605.04














































GASTON LAKE








































Reservoir elevation








































at end of month








































(feet,m.s.l.)







199.60

199.62

199.70

198.88

199.60

199.90

199.39

199.28

199.44

199.64

199.50

199.12














































ROANOKE RAPIDS LAKE








































Reservoir elevation








































at end of month








































(feet,m.s.l.)







129.5

130.5

130.4

131.5

129.5

131.8

130.6

130.1

129.6

129.9

128.8

129.7


TABLE 4

SUMMARY OF RESERVOIR CONDITIONS AND PERFORMANCE

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