||Interrelationship of Surface and Subsurface Flow in the Nishnabotna Drainage Basin.
Sendlei, Lyle V. A. ;
Husse, Keith M. ;
Ston, Randolph ;
||Iowa State Water Resources Research Inst., Ames.
||ISWRRI-34; DI-14-31-0001-3215; OWRR-A-030-IA; 13655,; A-030-IA(1)
( Ground water ;
( Rivers ;
Water quality ;
Nishnabotna River ;
Fremont Channel ;
Nishnabotna drainage basin
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||The Nishnabotna River Basin is situated in a glacial terrain underlain by a bedrock valley system that contains important volumes of pro-glacial sand and gravel. Study of low-flow river discharge, patterns of spatial variation of groundwater hydraulic head potential, surface and groundwater quality relations, and subsurface geology indicate that topography controls the pattern of groundwater flow near the Basin divide but that groundwater flow patterns within the Basin respond to both surface topography and the subsurface geology. Exportation of groundwater from the Basin at locations other than the surface outlet is limited to flow of about 500,000 gpd through the pro-glacial aquifer of a tributary bedrock valley. The major bedrock valley, the Fremont Channel, exerts strong potential drawdown effects within the Basin. Where this bedrock valley horizontally coincides with the West Nishnabotna valley, the drawdown effects of the two are superimposed, and a balance between stream flow and groundwater flow is maintained with groundwater discharge to the river. (Author)
|NTIS Title Notes
||Completion rept. Jul 68-Jun 71.
|PUB Date Free Form
||PC A09 MF A01