▁and ▁for ▁vol atile ▁organ ic ▁comp ound ▁( V OC ) ▁removal ▁and ▁reduces ▁the ▁sp ill way ▁length ▁or ▁elimin ates ▁need ▁for ▁still ing ▁bas in . ▁ ▁However , ▁few ▁design ▁gu idel ines ▁are ▁in ▁place ▁and ▁stepped ▁sp ill ways ▁have ▁only ▁been ▁successful ▁for ▁small ▁unit ▁dis charg es ▁where ▁step ▁height ▁can ▁influence ▁the ▁flow . ▁ ▁Side ▁channel ▁sp ill ways ▁▁ ▁Side ▁channel ▁sp ill ways ▁are ▁typically ▁used ▁to ▁dis charge ▁flo ods ▁per pend icular ▁to ▁the ▁general ▁direction ▁of ▁flow ▁by ▁placing ▁the ▁control ▁we ir ▁parallel ▁to ▁the ▁upper ▁portion ▁of ▁the ▁dis charge ▁channel . ▁ ▁It ▁offers ▁low ▁flow ▁veloc ities ▁up stream ▁and ▁minim izes ▁er os ion . ▁ ▁However , ▁it ▁can ▁cause ▁a ▁sudden ▁increase ▁in ▁res er voir ▁level ▁if ▁the ▁channel ▁is ▁sub mer ged . ▁ ▁Flow ▁R ates ▁ ▁D ifferent ▁ag encies ▁have ▁different ▁methods ▁and ▁formulas ▁for ▁quant ifying ▁flows ▁and ▁convey ance ▁capac ities ▁for ▁ch ute ▁sp ill ways . ▁The ▁Natural ▁Resources ▁Conserv ation ▁Service ▁( NR CS ) ▁produced ▁hand books ▁on ▁dam ▁design . ▁In ▁National ▁Engineering ▁Hand book , ▁Section ▁ 1 4 , ▁Ch ute ▁Sp ill ways ▁( NE H 1 4 ), ▁flow ▁equations ▁are ▁given ▁for ▁straight ▁in lets ▁and ▁box ▁in lets . ▁ ▁NE H 1 4 ▁provides ▁the ▁following ▁dis charge - head ▁relationship ▁for ▁straight ▁in lets ▁of ▁ch ute ▁sp ill ways