Underdrain System Discharge Calculator

Calculate the discharge of an underdrain system using the formula:
\(\displaystyle Q = \frac{K_s \times A_d \times (H_{in} – H_{out})}{L_d}\)

* Enter the hydraulic conductivity \(K_s\) (ft/day), effective underdrain area \(A_d\) (ft²), inlet head \(H_{in}\) (ft), outlet head \(H_{out}\) (ft), and flow length \(L_d\) (ft).

Step 1: Enter Parameters

Hydraulic Conductivity, \(K_s\) (ft/day):

Example: 2.0 ft/day

Effective Underdrain Area, \(A_d\) (ft²):

Example: 50 ft²

Inlet Head, \(H_{in}\) (ft):

Example: 10 ft

Outlet Head, \(H_{out}\) (ft):

Example: 2 ft

Flow Path Length, \(L_d\) (ft):

Example: 20 ft

Step 1: Enter Parameters

Calculated Discharge