pressure slope meaning in English

压力曲线斜率

( 5 ) it was more precise for using darcy - weisbach formula to calculate the hydraulic pressure slope curve in the lateral line , but too complexity . although i - pm wu formula is simple , the estimated results were not agreement with the measured data . a coefficient including irrigation uniformity was presented to modify i - pal wu formula , and the results were agreement after using the coefficient
（ 4 ）利用达西?韦斯巴赫公式计算微孔毛管的沿程水头损失具有较高的精度，但计算复杂，吴义伯公式计算虽较简单，但在灌水均匀度较差时误差较大，为此对吴义伯公式进行了修正，提出了修正系数的计算经验公式，取得了良好的结果，为简易地下滴灌工程设计中水力计算建立了简化公式。