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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