Table 2. Selected streamflow characteristics of principal river basins in Maryland and the District of Columbia

Streamflow characteristics: The 7-day, 10-year low flow is a discharge statistic; the lowest mean discharge during 7 consecutive days of a year will be equal to or less than this value, on the average, once every 10 years. The average discharge is the arithmetic average of annual average discharges during the period of analysis. The 100-year flood is that flow that has a 1-percent chance of being equaled or exceeded in a given year. Abbreviations: Do. =ditt0; m2= square miles; ft3/s= cubic feet per second; .. .. = insufficient data or not applicable. Sources: Reports of the U.S. Geological Survey and Maryland State agencies]

Site
no.
(see
fig. 2)		 Gaging station
-----------------------------------------------------------		 Streamflow Characteristics
-----------------------------------------
Name and
USGS no.		 Drainage
area
(mi2)		 Period
of
analysis		 7-day,
10-year
low flow
(ft3/s)		 Average
discharge
(ft3/s)		 100-year
flood
(ft3/s)		 Degree
of
regulation		 Remarks
MID-ATLANTIC REGION
POTOMAC SUBREGION
1. Conococheague Creek at Pairview 1016145001. 494 1928-83 53 590 26,800 Negligible Major water use is irrigation.
2. Antietam Creek near Sharpsburg (01619500). 281 1899-1983 66 275 14,400 ... do... Adjusted for inflow since Jan. 1930. Major water use is irrigation.
3. Monocacy River at Jug Bridge near Frederick (016430001). 817 1929-83 50 926 65,900 ...do... Major water use includes irrigation and Municipal supply
UPPER CHESAPEAKE SUBREGION
4. Pocomoke River near Willards (01485000). 60.5 1949-83 3.4 71 1,830 Negligible Major water use is for recreation
5. Choptank River near Greensboro (01491000). 113 1948-83 5.4 132 9,360 ...do... Diversions for irrigation above station. Major water use is for recreation.
6. Patuxent River near Unity (01591000). 34.8 1944-83 2.8 39 26,900 ...do... Major water uses include municipal and industrial supplies and recreation.
SUSQUEHANNA SUBREGION
7. Susquehanna River at Conowingo (01578310). 27,100 1968-83 ... 42.180 ... Appreciable Regulated since Oct. 1928. Major water uses include hydroelectric and recreation.
OHIO REGION
MONONGAHELA SUBREGION
8. Youghiogheny River near Oakland (03075500). 134 1941-83 5.9 297 12,800 Negligible Major water use is for recreation.