LOW-FLOW AND BASIN CHARACTERISTICS OF TWO STREAMS IN NORTHERN VERMONT

DURING A 6-YEAR PERIOD, THE MINIMUM FLOWS PER UNIT OF AREA IN A 3.2-SQUARE-MILE BASIN OF NORTHERN VERMONT WERE 9.00027 IN/H COMPARED WITH 0.00003 IN/H IN AN ADJACENT 8.4-SQUARE- MILE BASIN. AS THE CLIMATE, GEOLOGY, AND LAND USE IN THE TWO BASINS ARE SIMILAR, THE DIFFERENCES IN LOW FLOW ARE PROBABLY CAUSED BY DIFFERENCES IN TOPOGRAPHY AND IN SOILS. FIFTY-FOUR PER CENT OF THE LARGER, LOW-YIELDING BASIN HAS SLOPES OF 8 PER CENT OR LESS. SLOPES OF 8 PER CENT OR LESS OCCUR IN ONLY 28 PER CENT OF THE SMALLER BASIN. POORLY AND VERY POORLY DRAINED FRAGIPAN SOILS (TYPIC AND HUMIC FRAGIAQUEPTS) OCCUPY 44 PER CENT OF THE LARGER BASIN, AS OPPOSED TO ONLY 22 PER CENT OF THE SMALLER, STEEPER BASIN. THESE SOILS HAVE AN O HORIZON, AN A HORIZON WITH HIGH ORGANIC CONTENT, AND A FRAGIPAN AT DEPTHS GENERALLY BETWEEN 12 AND 18 INCHES. THEIR EFFECT IS TO RETARD OR IMPEDE DEEP PERCOLATION TO STORAGE, AND TO RETAIN MOISTURE IN THE SURFICIAL HORIZONS EVEN AT HIGH TENSIONS. IN THE SMALLER BASIN, HIGH BASE FLOW IS PROBABLY SUSTAINED BY THE SLOW RELEASE OF MOISTURE FROM THE DEEPER, SURFICIALLY WELL-DRAINED SOILS THAT PREVAIL IN IT. /AUTHOR/

  • Supplemental Notes:
    • Vol 7, No 1, PP 98-108, 3 FIG, 4 TAB, 14 REF
  • Authors:
    • Comer, G H
    • Zimmermann, R C
  • Publication Date: 1968-11

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  • Accession Number: 00204195
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jan 23 1994 12:00AM