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<br />ix <br /> <br />pe1'711eabLe.--Pertaining to a rock or soi 1 hav'ing a textu,-e that permits pas- <br />sage of liquids or gases under the pressure ordinarily found in earth <br />materials. <br />point of zero j'louJ.-A term used herein to denote the elevation at a cross- <br />section on a stream at which th~ stream ceases to flow. The elevation <br />represents an average streambed at the section; thus, small crevices and <br />cracks in the streambed can be ignored. <br />recurrence intervaL.--The average interval of time, in years, within '."hich <br />a given flood will be exceeded once. <br />residuaLs.--The difference between the measured value of an observation and <br />the value computed from a relation based on all observations in the <br />sample. <br />skeumess.--A numerical measure or index of asymmetry of a frequency distri- <br />bution. From a practical standpoint, the term indicates positive or <br />negative curvature of a flood-frequency relation. <br />stage.--The height of a water surface above an establ ished datum p'lane; also <br />gage height. <br />stage-discharge reLation.--A graph Showing the relation between the gage <br />height and the volume of water flowing in a channel. <br />standard er!>or of estimate.--A meaSUre of ho", wel'l observed data agrees with <br />a regression relation which is computed from the differences (residuals) <br />between observed data and the regression equation. <br />stream.--Any body of water from a large river to a small ri 11 moving under <br />gravity flow to progressively lower levels in a relatively narrow but <br />clearly defined channel on the surface of the ground. <br />bleighted fl.ood discharge.--A flood discharge for a selected recurrence inter- <br />val computed as the weighted aVerage of the station value and the regres- <br />sion value. The weighted aver"ge is based on len(jth of record of the <br />station data and equivalent ye"rs of record for the regression value. <br /> <br />j <br />I <br /> <br />I <br />I <br />