T—从鼻坎起算的上游水头;T_0—从下游河床起算的上游水深;P—从下游河床起算的坝高;a—鼻坎高度;d—坝顶至鼻坎顶之垂距;t—面流水跃末端水深,即第一临界水深;h—鼻坎末端垂直反弧切线之水股厚度;h_0—坎下超压,即鼻坎末端底部流线压强超过静水压强部分压强增值;v_1—鼻坎末端流速;q—单宽流量;θ—鼻坎仰角;φ—计算至鼻坎末端的流速系数,对一般矮堰建议采用:φ=0.98;t_0—冲刷坑水深; T - upstream head from the nose; T_0 - upstream water depth from downstream river bed; P - height of dam from downstream river bed; a - height of nose ridge; d - H_0- hover over the pressure, that is, the nose flow at the end of the bottom streamline pressure exceeds hydrostatic pressure part of the value of the increase; v_1- Q-single-wide flow rate; θ-nasal ridge elevation; φ-calculated to the end of the nasal flow rate coefficient, for the general dyke recommended: φ = 0.98; t_0- scour pit depth;