REPRODUCTION OF THE RUNOFF-RECORD OF THE RIO MOTATAN BY RAIN DATA,ESTABLISHING THE TRUE MONTHLY RUNOFF-FACTOR |
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| Authors: | John v G GSCHWENDTNER |
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| Institution: | University of Scranton , Scranton, Pa. |
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| Abstract: | Abstract In 1950 only 10 years of streamflow observations and runoff data existed on the Rio Motatan in Western Venezuela (4,200 km2 of watershed, Anden territory) with 24 raingauge stations in or near the watershed having a simultaneous record but only 3 recording stations with 30 years of observation. The “curve of dry spell”—January to April—was first determined on semilog hydrographs (logs of daily discharge vs. time) and by splitting the total flow into surface and groundwater components an abacus was established, relating the average monthly rain with the “true runoff”. (True runoff) = (observed runoff)—(part due to former month of rain) + (share in following months). For checking purposes the observed runoff record was reproduced, using data based on rain, reaching a high degree of accuracy. Then the same abacus was applied to the 20 years of isolated rain data and the corresponding runoff values were obtained. Recently seven more years of runoff data were successfully checked against the graphs. |
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