Water Resources Review – July 2001

Updated: July 31, 2001

See definitions.

Maryland And Delaware. -- Streamflow decreased throughout the entire bi-state area. In Western Maryland and on the upper Potomac River, streamflow decreased, and remained in the normal range. In Central Maryland, flows decreased, and moved from the above-normal into the normal range. Flows on the lower Potomac River decreased, and remain in the normal range. In northeast Maryland, flows decreased, and remain in the below-normal range for the third month straight. On the Eastern Shore, streamflow decreased from the previous month’s record high, although remaining in the above-normal range.

Contents of the Baltimore reservoir system decreased, and near month's end were 82 percent of capacity. End of month contents = 62,100 million gallons.

Ground-water levels decreased throughout most of the bi-state area. In western Maryland, ground-water levels fell, and remained in the above-normal range. In west-central Maryland, ground-water levels decreased, and remained in the below-normal range. In central Maryland, water levels decreased, and remained in the below-normal range. On the Eastern Shore, water levels fell, and remained in the above-normal range.

---

Surface Water Data -- July 2001

[% = percent; ft³/s = cubic feet per second; in. = inches; Date = day of month;
¹ = Includes diversions for water supply; * = Above normal range; # = Below normal range]

Station name	Discharge		Runoff (in.)	Cumulative runoff			Maximum (ft^3/s) --- (Date)	Minimum (ft^3/s) --- (Date)
	Mean (ft^3/s)	Percent of normal		Total (in.)	Percent of normal	Departure (in.)
Potomac R at Paw Paw, W.Va.	1760	133	0.64	10.50	68	-4.90	8500 (30)	832 (26)
Seneca C at Dawsonville, Md.	67.1	91	0.76	11.99	75	-3.91	212 (9)	36 (26)
Potomac R near Washington, D.C. ^1	4000	80	0.40	8.91	63	-5.29	7940 (5)	2330 (28)
Deer C near  Rocks, Md.	#48.9	52	0.60	11.50	66	-6.00	81 (11)	37  (26,28)
Choptank R near Greensboro, Md.	*103	224	1.05	19.37	121	+3.37	372 (6)	42 (25)

Normal is defined as the median (50^th percentile) of long-term monthly-mean discharge or monthly total runoff. The normal range is defined as discharge or runoff falling between the 75^th and 25^th percentiles of long-term records. 

---

Ground Water Data – July 2001

Well number	Well name	Previous month		Reporting month
		Date measured	Level (feet below land surface)	Date measured	Level (feet below land surface)
GA-Bc 1	Accident	06-28	13.88	07-30	14.16
WA-Be 2	Fort Frederick	06-28	31.61	07-30	33.07
MO-Eh 20	Fairland	06-28	12.73	07-30	13.77
Jd 42-03	Camden	06-28	4.84	07-26	5.59

Name	Date measured	Water level (feet below land surface)	Departure from average (feet)	Change since previous month (feet)	Change since previous year (feet)	Last reversal
						Change (feet)	Date (month, year)
Accident	07-30	14.16	+0.78	-0.28	+1.19	-1.59	June 2001
Fort Frederick	07-30	33.07	-1.23	-1.46	-1.27	-7.31	Apr 2001
Fairland	07-30	13.77	-0.42	-1.04	-0.60	-1.69	June 2001
Camden	07-26	5.59	+0.95	-0.75	+0.94	-0.75	July 2001

---

Potomac River near Washington, D.C.  -  July 2001

Last day: 5610 cubic feet per second (estimated).
Reference period: 1971 to 2000.

Chesapeake Bay – July 2001

Total flow into the Chesapeake Bay was about 15.3 billion gallons per day, (BGD) 67 percent of average. July average: 23.0 BGD.

The three largest rivers flowing into the Chesapeake Bay contributed about 80 percent of total inflow in July, with individual contributions of:

River	Percentage of total inflow to Chesapeake Bay
Susquehanna River	46
Potomac River	24
James River	10
Total	80
Other rivers	20

Period of record: 1937 to Present. 

---

Related Information

Reports for previous months

Monthly Water Conditions in the Chesapeake Bay Region

National Water Conditions

Definitions of terms

Northeast Regional Climate Center (from Cornell University)

Monthly Climate Summary

---

For additional information, contact:

info@md.water.usgs.gov or call 410-238-4200.