000			01531nab a22003377a 4500
001			G29980
003			MX-TxCIM
008			121211b |||p||p||||||| |z||| |
040			_aMX-TxCIM
041	0		_aEn
043			_aUS
072		0	_aP11
090			_aREP-3754
100	1		_aBazaraa, A.S.
245	0	0	_aArtesian and anisotropic effects on drain spacing
260			_c1986
340			_aPrinted
500			_aTables, graphs, references p. 64
520			_aSubsurface drainage systems installed in soil overlying artesian aquifers should be spaced to handle both upward artesian water flow and normal downward seepage flow from irrigation and rainfall. Proper drain spacing depends on several parameters, while a narrower than normal spacing is required for drains subject to artesian conditions. The hydraulic conductivity of the soil above an artesian aquifer determines the ease with which water flows to the drains and the magnitude of the upward artesian water flux for a given piezometric head andsoil layer thickness. Since water movement to subsurface drains depends on both the horizontal and vertical
546			_aEnglish
595			_aRPC
650	1	0	_aDrainage systems
650	1	0	_aHydraulic engineering
650	1	0	_aHydraulic structures
650	1	0	_aSubsurface drainage
700	1		_aAbdel Dayem, M.S., _ecoaut.
700	1		_aAmer, A., _ecoaut.
700	1		_aWillardson, L.S., _ecoaut.
773	0		_tJournal of Irrigation and Drainage Engineering _n615337 _gv. 112, no. 1, p. 55-64
942			_cJA
999			_c12117 _d12117