Table 1. Surface-water facts for Maryland and the District of Columbia
[Data may not add to totals because of independent rounding. Mgal/d == million gallons per day; gal/d = gallons per day; < = less than. Source: Maryland- Herring (1983), Sotley, Chase, and Mann, (1983); District of Columbia-Solley, Chase, and Mann (1983)] ---------------------------------------------------------------------------- POPULATION SERVED BY SURFACE WATER, 1980 Md D.C. Number (thousands)........................................... 3,040 638 Percentage of total population............................... 72 100 From public water-supply systems: Number (thousands)......................................... 3,040 638 Percentage of total population............................. 72 100 From rural self-supplied systems: Number (thousands)......................................... 0 0 Percentage of total population............................. 0 0 ---------------------------------------------------------------------------- OFFSTREAM USE, 1980 FRESHWATER WITHDRAWALS Surface water and ground water, total (Mgal/d)............... 1,400 340 Surface water only (Mgal/d).................................. 970 340 Percentage of total........................................ 70 100 Percentage of total excluding withdrawals for thermoelectric power.............................. 58 100 Category of use Public-supply withdrawals: Surface water (Mgal/d)..................................... 440 210 Percentage of total surface water.......................... 45 62 Percentage of total public supply.......................... 90 100 Per capita (gal/d)........................................... 145 329 Rural-supply withdrawals: Domestic: Surface water (Mgal/d)................................... 0 0 Percentage of total surface water........................ 0 0 Percentage of total rural domestic....................... 0 0 Per capita (gal/d)....................................... 0 0 Livestock: Surface water (Mgal/d)................................... 0.5 0 Percentage of total surface water........................ <0.1 0 Percentage of total livestock............................ 5 0 Industrial self-supplied withdrawals: Surface water (Mgal/d)................................... 520 130 Percentage of total surface water........................ 53 38 Percentage of total industrial self-supplied: Including withdrawals for thermoelectric power........... 93 100 Excluding withdrawals for thermoelectric power........... 80 43 Irrigation withdrawals: Surface water (Mgal/d)................................... 9.4 0 Percentage of total surface water........................ 1 0 Percentage of total irrigation........................... 47 0 ---------------------------------------------------------------------------- INSTREAM USE, 1980 Hydroelectric power (Mgal/d)................................. 15,000 8.0 ---------------------------------------------------------------------------- |