Page 101 - Water Standards

conduit.Thedimensionsofwaterconduitarep rovidedb yunit
manufacturerandma yalsobeestimatedwithemp iricalformulae
whenrelevantinformationfrommanufacturerisnotavailablein
theearliersta g e.
5 Thearran g ementofp assa g ewa y sinthep owerhouse
shallmeetthere q uirementsoffirep rotectionandevacuation.
Thereshouldbe2ormorestairstotheg aller yatthebottomof
turbineshaftfromtheto pslabofwaterconduit.
6 Theinvertelevationandthesubmer g edde p thofintake
shallcomp l ywithSL285.Trashracksandcleanin gdeviceshall
beinstalledinfrontoftheintake, andthevelocit yofwaterflow-
in gthrou g hthetrashracksshouldbe1.0 1.4m / s.
7 Thesubmer g edde p thofdrafttubeoutletshallbeg rea-
) (
terthanν/( 2 g νistheavera g evelocit yofoutletsectionof
2
drafttube )andshallnotbelessthan0.5m.
8 Thet yp eandlocationofg ateshallbeselectedreasona-
,
bl y takin gintoaccounttherunawa yp rotectionmeasuresofu-
nits.
9 Theaccesstothep owerhousema ybeverticalorhorizon-
tal , buttheo p timaloneshallbeselectedthrou g hcomp rehensive
comp arison.Forthep owerhousewithhi g htailwaterlevel , relia-
blefloodp rotectionanddraina g emeasuresshallbetakenforthe
accessfacilitiestop owerhouse.
8.1.2 Inadditiontothedesi g np rovisionsforsurfacep ower-
house , followin gre q uirementsshallbemetinthestructurede-
si g nofbulbunitp owerhouse :
1 Whenthesubstructureofp owerhouseiscalculatedwith
thestructuralmechanicsmethod, thej ointstiffnessandtheim-
p actofshearin gdeformationshallbetakenintoaccount.
2 Theinletsectionanddrafttubesectionofwaterconduit

3 9