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Afluencia. Aquella parte de1 rendimiento de1 agua que<br />

aparece en el cauda.<br />

Caudal. El flujo actual en las corrientes, estkn o no<br />

sujetas a regulation, o flujo subhlveo.<br />

Cada uno de estos terminos se puede reportar en<br />

volumen total o en unidades de tiempo.<br />

De&o - la toma de1 agua de un arroyo u otra fuente de<br />

agua en un canal: tier& u otro conducto.<br />

Curva de Doble Masa - un diagrama sobre papel cork<br />

sectional aritm&ico de 10s valores acumulados de una<br />

variante <strong>com</strong>parados con 10s valores acumulados de otra, o<br />

con 10s valores <strong>com</strong>putados de la misma variante por un<br />

pen’odo de tiempo concurrente.<br />

Area de Drenaje - el tiea de drenaje de una corriente<br />

ubicada en un lugar especifico es ese &rea, medido en un<br />

plano horizontal, el cual esti encerrado por una divisoria<br />

de drenaje.<br />

Cuenca de Drenaje - es una parte de la superficie de la<br />

tierra que est6 ocupada por un sistema de drenaje que<br />

COi&k en una corriente alperfkid o illl cuerpo de agua<br />

superficial represada junto con todas las corrientes<br />

tributarias superficiales y cuerpos de agua superficial<br />

represada.<br />

Sequia - es un pen’odo de precipitaci6n deficiente o de<br />

afluencia que se extiende por un ntimero indefinido de<br />

&as, pero sin un patr6n standard que ayude a determinax<br />

la cantidad de deficiencia necesaria para constituir una se<br />

against the cumulated values of another or against<br />

the <strong>com</strong>puted values of the same variable for a con-<br />

current period of time.<br />

Drainage Area - the drainage area of a stream at a<br />

specified location is that area, measured in a horizon-<br />

tal plane, which is enclosed by a drainage divide.<br />

Drainage Basin - a part of the surface of the earth<br />

that is occupied by a drainage system, which consists<br />

of a surface stream or a body of impounded surface<br />

water together with all tributary surface streams and<br />

bodies of impounded surface water.<br />

Drought - a period of deficient precipitation or runoff<br />

extending over an indefinite number of days, but with<br />

no set standard by which to determine the amount of<br />

deficiency needed to constitute a drought. Thus, there<br />

is no universally accepted quantitative detinition of<br />

drought; generally, each investigator<br />

own definition.<br />

establishes his<br />

The following paragraph discusses the problem of<br />

defining a drought:<br />

When in an area that is ordinarily classed as humid,<br />

natural vegetation be<strong>com</strong>es desiccated or defoliates<br />

unseasonably and crops fail to mature owing to lack<br />

of precipitation, or when precipitation is insufficient to<br />

meet the needs of established human activities,<br />

drought conditions may be said to prevail. Although<br />

water for irrigation or other uses in arid areas is<br />

always limited, special shortages in such areas are<br />

qtia. Asi, nv n =- --;stc! una definicidn cuantitativa aceptada also regarded as droughts. Unsatisfactory distribution<br />

universalmente para la seqtia; generalment,e, cada in- of precipitation throughout the year may be as effecvestigador<br />

establece su propia definicibn.<br />

tive a factor in causing a drought as a shortage in the<br />

El siguienk pkrafo cubre el problema cZe definir una se- total amount. Temperature and wind may also play an<br />

qtia:<br />

important part, especially in relation to the damage<br />

Cuando en un 5rea que es normalmente clasificad <strong>com</strong>a done.<br />

htimed, la vegetacidn natural se deseca o ocurre<br />

defoliacibn fuera de su estacidn y las cosechas no maduran<br />

par falta de lluvias, o cu&ndo las lluvias no son suficientes<br />

<strong>com</strong>a paxa satisfacer las necesidades de las actividades<br />

humanas establecidas, se puede decir que prevalecen condiciones<br />

de seqtia. Aunque el agua para irrigacidn y otros<br />

fines en tireas kidas siempre es limitada, 10s cases<br />

especiales de escazks en tales 5rea.s son clasificados tambi6n<br />

<strong>com</strong>a seqtia. Una distribuci6n insatisfactoria de las<br />

precipetaciones durante el tie puede ser un factor tan<br />

efectivo en causar una sequia <strong>com</strong>a la falta en la cantidad<br />

total. La temperatura y el viento tambibn juegan un papel<br />

muy importante, especialmente en re!acibn al dtio<br />

Effective Precipitation (rainfall) - 1. That part of the<br />

precipitation that produces runoff. 2. A weighted<br />

average of current and antecedent precipitation that is<br />

“‘effective” in correlating with runoff. 3. That part of<br />

the precipitation fa!ling on an irrigated area that is effective<br />

in meeting the consumptive use requirements.<br />

Energy - the capacity for performing work. The electrical<br />

energy term generally used is kilowatt-hours and<br />

represents power (kilowatts) operating for some time<br />

period (hours).<br />

Energy Value - that part of the market value of electric<br />

power which is assigned to energy generated.<br />

causado.<br />

Evaporation - the process by which water is changed<br />

Precipitacibn Efectiva (lluvias) - 1. Aquella parte de la<br />

precipitaci6n que produce afluencia. 2. Un promedio<br />

sopesado de precipitacibn corriente y antecedente que es<br />

from the liquid or the solid state into the vapor state.<br />

In hydrology, evaporation is vaporization that takes<br />

place at a temperature below the boiling point.<br />

“efectivo” en establecer una correlaci6n con la afluencia. Evaporation Pan - an open tank used to contain<br />

3. Aquella parte dr la precipitaci6n que cae sobre una Brea water for measuring the amount of evaporation. The<br />

irrigada, que es efectiva para satisfacer 10s requisitos de U.S. Weather Bureau class A pan is 4 feet in diameter,<br />

consume.<br />

10 inches deep, set up on a timber grillage so that the<br />

324

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