Skip to Main Content
Importance of Wetlands to Streamflow GenerationAuthor(s): E. S. Verry; R. K. Kolka
Source: In: Renard, Kenneth G.;et al., eds. 1st Interagency Conference on Research in the Watersheds; 2003 October 27-30; Benson, AZ. [City, State]: US Department of Agriculture, Agricultural Research Service: 126-132
Publication Series: Scientific Journal (JRNL)
Station: North Central Research Station
PDF: View PDF (1.06 MB)
DescriptionHewlett (1961) proposed the variable-source-area concept of streamflow origin in the mountains of North Carolina suggesting streamflow was produced from water leaving saturated areas near the channel. Dunne and Black confirmed this concept on the Sleepers River watershed in Vermont (1970). Areas near the river were saturated by subsurface or interflow from adjacent upland slopes. In turn, these saturated areas fed water directly to the channel. In the northern Lake States, wetlands and lakes make up 10 to 35% of the basin. These flat landscape components are surrounded by relatively steep (10-15% slope) glacial moraine uplands. We investigated the importance of wetlands to streamflow production on watershed two at the Marcell Experimental Forest in north central Minnesota. A hydrograph seperation technique for the entire watershed yielded hydrographs for water both from the upland alone and from the wetland alone. Additionally, selected direct measurements of upland runoff and watershed streamflow confirmed the timing of hydrograph peaks for the separated watershed components. The wetland produced 50 to 70% of the annual streamflow even though the wetland comprised only l/3" of the basin. Storm peaks from the wetland were 5 to 10 times higher than storm peaks from the upland and occurred about 1 hour before upland runoff peaked. Saturated wetlands (and lake surfaces) are the primary source of streamflow in these glacial landscapes.
- Check the Northern Research Station web site to request a printed copy of this publication.
- Our on-line publications are scanned and captured using Adobe Acrobat.
- During the capture process some typographical errors may occur.
- Please contact Sharon Hobrla, firstname.lastname@example.org if you notice any errors which make this publication unusable.
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationVerry, E. S.; Kolka, R. K. 2003. Importance of Wetlands to Streamflow Generation. In: Renard, Kenneth G.;et al., eds. 1st Interagency Conference on Research in the Watersheds; 2003 October 27-30; Benson, AZ. [City, State]: US Department of Agriculture, Agricultural Research Service: 126-132
Keywordssource of streamflow, peatlands, uplands, subsurface flow, interflow, hydrograph separation
- A comparison of the watershed hydrology of coastal forested wetlands and the mountainous uplands in the Southern US
- Factors influencing storm-generated suspended-sediment concentrations and loads in four basins of contrasting land use, humid-tropical Puerto Rico
- Simulating double-peak hydrographs from single storms over mixed-use watersheds
XML: View XML