Difference between discharge in ground water flow and hydraulic gradient in flow analysis in Plaxis 2D

Question

Hi all, 
 In the flow analysis, the cross-section is cut through (2,11) and (5,11) for qy and iy as shown below.

This is the homogeneous soil with kx=ky=0.6221 m/day. here q=ki and left side of flow qleft = iyleft * k = 0.2063 * 0.6221 = 0.12834 m/day and qright = iyright * k = 0.1663 * 0.6221 = 0.103455 m/day and using flow section, discharge = area of the trapezium = 0.5 (0.1284 + 0.1035) * 3 = 0.34785 m3/day/m. 
 
 My question => In the same section why the total discharge which is shown under hydraulic gradient is different from that on qy section? 
 
 Thanks.

Stefanos Papavasileiou · Answer

Dear Nitharshan, 
 The total discharge value shown under the hydraulic gradient results does not have any physical meaning to be displayed. 
 Due to the implementation, we would show a value based on the integration of the current result type (left groundwater flow - right hydraulic gradient), but both are named as "total discharge". 
 This will be corrected in our upcoming version, and no total discharge result will be shown for the hydraulic gradient results.

Difference between discharge in ground water flow and hydraulic gradient in flow analysis in Plaxis 2D

Top Replies