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UNCERTAINTY ANALYSIS OF RUNOFF ESTIMATES FROM A RUNOFF CONTOUR MAP
Citation:
Rochelle, B., D. Jr, AND M. Church. UNCERTAINTY ANALYSIS OF RUNOFF ESTIMATES FROM A RUNOFF CONTOUR MAP. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-89/134 (NTIS PB90125659), 1989.
Description:
The US EPA in cooperation with the USGS conducted an analysis to quantify the uncertainty associated with interpolatinq runoff to specific sites using a runoff contour map. e interpolated runoff to 93 gaged watersheds from a runoff contour map using 1) hand interpolation to the watershed outlet, 2) a computer interpolation to the watershed outlet, and 3) hand interpolation to the watershed centroid. e compared the interpolated values to the actual gaged values and found that there was a bias in the average interpolated value for runoff estimated at basin outlets, with interpolated values being less than the actual. e found no siqnificant difference between the hand interpolation method and the computer interpolation method except that the computer method tended to have hiqher variability due to factors inherent to the software used. here were no strong spatial correlations or regional patterns in the runoff interpolations, which indicates that there are no regional biases introduced in the development of the contour map. We determined that we could estimate runoff, on the average within approximately 15% of the measured value usinq the three methods. he results of this work indicate that runoff contour maps can be used in reqional studies to estimate runoff to unqaged systems with quantifiable uncertainty.
