Answer
Halin jujjuyawar lodi don magudanar ruwa mai juyawa da yawa-zuwa-crest ana sarrafa shi da dabarar $P = \ frac {E \cdot b \cdot t^3 \cdot n^4 \cdot f}{D_m^3 \cdot N} \cdot K $, inda $P$ shine kaya, $E$ shine $$t radius, $$t shine bangon $bt. Kaurin abu, $n$ shine adadin raƙuman ruwa a kowane juyi, $f$ shine jujjuyawa, $D_m$ shine matsakaicin diamita, kuma $N$ shine adadin jujjuyawar aiki. Dalilin $K$ yana wakiltar gyara don karkatar da kayan. Yana da mahimmanci a lura cewa wannan alaƙar layi tana yawanci tsakanin 20% zuwa 80% na jujjuyawar da ake samu. Bayan wannan kewayon, ƙimar bazara tana ƙaruwa sosai yayin da raƙuman ruwa suka fara karkata da tuntuɓar jujjuyawar da ke kusa ko saman mahalli, wanda ke haifar da yanayin da aka sani da 'ƙasa ƙasa' ko 'tsawo mai ƙarfi' yana gabatowa. Dole ne injiniyoyi su tabbatar da tsayin aiki $H_w$ ya fi tsayin tsayi $H_s = N \cdot t$ don hana nakasar filastik ta dindindin.
