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darcys law
1.
DDaarrccyy’’ss LLaaww aanndd
PPeerrmmeeaabbiilliittyy DDaarrccyy''ss llaaww IInn 11885566,, aa FFrreenncchh hhyyddrraauulliicc eennggiinneeeerr nnaammeedd HHeennrryy DDaarrccyy ppuubblliisshheedd aann eeqquuaattiioonn ffoorr ffllooww tthhrroouugghh aa ppoorroouuss mmeeddiiuumm LLaaww SSttaatteess:: QQ ==-- KKAA (hhbb--hhaa)//LL oorr qq oorr VV== QQ//AA == --KK ddhh//ddll,, hh:: hhyyddrraauulliicc hheeaadd,, qq == QQ//AA iiss tthhee ssppeecciiffiicc ddiisscchhaarrggee [[LL//TT]],, ddhh//ddll iiss tthhee hhyyddrraauulliicc ggrraaddiieenntt KK iiss tthhee hhyyddrraauulliicc ccoonndduuccttiivviittyy [[LL//TT]] oorr PPeerrmmeeaabbiillttyy (ccooeeffff.. OOff ppeerrmmeeaabbiilliittyy) --vvee iinnddiiccaattee ffllooww ffrroomm hhiigghh hh ttoo llooww hh
2.
EExxppeerriimmeennttaall DDeessiiggnn
3.
KK vvss KKii
TThhee HHyyddrraauulliicc CCoonndduuccttiivviittyy ((KK)) iiss aa mmeeaassuurree ooff hhooww eeaassiillyy wwaatteerr mmoovveess tthhrroouugghh tthhee ppoorroouuss mmeeddiiaa.. IItt ddeeppeennddss oonn tthhee ppeerrmmeeaabbiilliittyy ooff tthhee mmaattrriixx,, bbuutt aallssoo iiss aa ffuunnccttiioonn ooff tthhee fflluuiidd.. IItt iiss aa mmeeaassuurree ooff ((lleennggtthh))//((ttiimmee)) PPeerrmmeeaabbiilliittyy ((kkii))iiss aa mmeeaassuurree ooff hhooww wweellll aa ppoorroouuss mmeeddiiaa ttrraannssmmiittss aa fflluuiidd.. IItt hhaass nnootthhiinngg ttoo ddoo wwiitthh tthhee fflluuiidd iittsseellff.. IItt iiss mmeeaassuurree iinn ((lleennggtthh))22..
4.
specific discharge
hhaass tthhee ddiimmeennssiioonn ooff aa vveelloocciittyy,, bbuutt iitt iiss nnoott tthhee vveelloocciittyy aatt wwhhiicchh tthhee wwaatteerr fflloowwss iinn tthhee ppoorroouuss mmeeddiiuumm,, tthhee wwaatteerr hhaass ttoo ssqquueeeezzee tthhrroouugghh tthhee ppoorreess EExxaammppllee ooff ccaallccuullaattiioonn DDaarrccyy''ss llaaww hhaass bbeeeenn ffoouunndd ttoo bbee iinnvvaalliidd ffoorr hhiigghh vvaalluueess ooff RReeyynnoollddss nnuummbbeerr aanndd aatt vveerryy llooww vvaalluueess ooff hhyyddrraauulliicc ggrraaddiieenntt iinn ssoommee vveerryy llooww--ppeerrmmeeaabbiilliittyy mmaatteerriiaallss,, ssuucchh aass ccllaayyss.. RReeyynnoollddss NNuummbbeerr aanndd tthhee DDaarrccyy lliimmiittaattiioonn ((FFoorrmmuullaa aanndd EExxaammppllee))
5.
What ddrriivveess ggrroouunnddwwaatteerr
ffllooww?? • wwaatteerr fflloowwss ffrroomm hhiigghh eelleevvaattiioonn ttoo llooww eelleevvaattiioonn aanndd • ffrroomm hhiigghh pprreessssuurree ttoo llooww pprreessssuurree,, ggrraaddiieennttss iinn ppootteennttiiaall eenneerrggyy ddrriivvee ggrroouunnddwwaatteerr ffllooww • tthhee hheeiigghhtt ttoo wwhhiicchh wwaatteerr rriisseess iinn aa wweellll ddeeffiinneess tthhee ppiieezzoommeettrriicc oorr ppootteennttiioommeettrriicc ssuurrffaaccee • WWaatteerr pprreessssuurree == aattmmoosspphheerriicc pprreessssuurree aatt WWaatteerr ttaabbllee • BBeerrnnoouullllii eeqquuaattiioonn ssaaiidd:: vv22//((22gg)) ++ zz ++pp//((ρρgg)) == ccoonnssttaanntt,, mmeeaannss:: vveelloocciittyy hheeaadd ++ eelleevvaattiioonn hheeaadd ++ pprreessssuurree hheeaadd == ttoottaall hheeaadd • ggrroouunnddwwaatteerr fflloowwss ffrroomm hhiigghh ttoo llooww hheeaadd
6.
• FFoorrccee PPootteennttiiaall
,, ΦΦ==gghh • tthhee eelleevvaattiioonn ooff tthhee wwaatteerr lleevveell iinn tthhee wweellll iiss aa mmeeaassuurree ooff tthhee ppootteennttiiaall eenneerrggyy aatt tthhee ooppeenniinngg ooff tthhee wweellll • EExxaammppllee ooff ccaallccuullaattiioonn :: HHyyddrraauulliicc hheeaadd aanndd GGWW ffllooww
7.
EExxttrraa NNootteess
oonn KK HHyyddrraauulliicc ccoonndduuccttiivviittyy iiss oonnee ooff tthhee hhyyddrraauulliicc pprrooppeerrttiieess ooff tthhee ssooiill;; tthhee ootthheerr iinnvvoollvveess tthhee ssooiill''ss fflluuiidd rreetteennttiioonn cchhaarraacctteerriissttiiccss.. TThheessee pprrooppeerrttiieess ddeetteerrmmiinnee tthhee bbeehhaavviioorr ooff tthhee ssooiill fflluuiidd wwiitthhiinn tthhee ssooiill ssyysstteemm uunnddeerr ssppeecciiffiieedd ccoonnddiittiioonnss.. MMoorree ssppeecciiffiiccaallllyy,, tthhee hhyyddrraauulliicc ccoonndduuccttiivviittyy ddeetteerrmmiinneess tthhee aabbiilliittyy ooff tthhee ssooiill fflluuiidd ttoo ffllooww tthhrroouugghh tthhee ssooiill mmaattrriixx ssyysstteemm uunnddeerr aa ssppeecciiffiieedd hhyyddrraauulliicc ggrraaddiieenntt;; tthhee ssooiill fflluuiidd rreetteennttiioonn cchhaarraacctteerriissttiiccss ddeetteerrmmiinnee tthhee aabbiilliittyy ooff tthhee ssooiill ssyysstteemm ttoo rreettaaiinn tthhee ssooiill fflluuiidd uunnddeerr aa ssppeecciiffiieedd pprreessssuurree ccoonnddiittiioonn.. TThhee hhyyddrraauulliicc ccoonndduuccttiivviittyy ddeeppeennddss oonn tthhee ssooiill ggrraaiinn ssiizzee,, tthhee ssttrruuccttuurree ooff tthhee ssooiill mmaattrriixx,, tthhee ttyyppee ooff ssooiill fflluuiidd,, aanndd tthhee rreellaattiivvee aammoouunntt ooff ssooiill fflluuiidd ((ssaattuurraattiioonn)) pprreesseenntt iinn tthhee ssooiill mmaattrriixx.. TThhee iimmppoorrttaanntt pprrooppeerrttiieess rreelleevvaanntt ttoo tthhee ssoolliidd mmaattrriixx ooff tthhee ssooiill iinncclluuddee ppoorree ssiizzee ddiissttrriibbuuttiioonn,, ppoorree sshhaappee,, ttoorrttuuoossiittyy,, ssppeecciiffiicc ssuurrffaaccee,, aanndd ppoorroossiittyy.. IInn rreellaattiioonn ttoo tthhee ssooiill fflluuiidd,, tthhee iimmppoorrttaanntt pprrooppeerrttiieess iinncclluuddee fflluuiidd ddeennssiittyy,, ,, aanndd fflluuiidd vviissccoossiittyy,, .. FFoorr aa ssuubbssuurrffaaccee ssyysstteemm ssaattuurraatteedd wwiitthh tthhee ssooiill fflluuiidd,, tthhee hhyyddrraauulliicc ccoonndduuccttiivviittyy,, KK,, ccaann bbee eexxpprreesssseedd aass ffoolllloowwss ((BBeeaarr 11997722)):: wwhheerree kk,, tthhee iinnttrriinnssiicc ppeerrmmeeaabbiilliittyy ooff tthhee ssooiill,, ddeeppeennddss oonnllyy oonn pprrooppeerrttiieess ooff tthhee ssoolliidd mmaattrriixx,, aanndd gg//,, ccaalllleedd tthhee fflluuiiddiittyy ooff tthhee lliiqquuiidd,, rreepprreesseennttss tthhee pprrooppeerrttiieess ooff tthhee ppeerrccoollaattiinngg fflluuiidd..
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