Two round$-$nosed piers, each $1\mathrm{.}64-$ft wide, are being considered at a spillway with a net length of $235ft$ just in case a roadway is placed over the spillway. The value of $P$ is $15ft,Ka=0\mathrm{.}2,$ and $Kp=0\mathrm{.}01.$ Calculate the new effective length of the crest. What would be the discharge for the design head of $16\mathrm{.}4ft$ and a head of $13\mathrm{.}12ft?$