Nabin Kumar Ijam | Civil & Hydropower Engineer

HYDRAULIC DESIGN OF SETTLING BASIN

1. INPUTS
Design discharge(\(Q\) in m³/s):
Additional design discharge for flushing(in %):
Size of sediments to be settled (\(d_s\) in mm):
Average water temperature (\(T\) in degree):
Longitudinal slope for flushing (1 in S):
Number of bays (\(n_b\)):
Sediment concentration (\(SC\) in Kg/m³):
Swelling factor (\(SF\)):
Flushing Interval (\(FI\) in hours):
Method used :
Vetter's trap efficiency (\(η\) in %):
Density of sediments (\(Y_s\) in Kg/m³):
Side slope of settling basin slab (\(z\) in 1H;zV>):
Hopper width (\(b_h\) in m):
METHOD TO USE THIS CALCULATOR

Input all the input data except width and length of basin and click on "SETTLING BASIN DESIGN".

Then update Basin width (Bs) and again click on "SETTLING BASIN DESIGN" after updating Width.

Similarly, update Settling basin length (L) after getting calculated L and then click on "SETTLING BASIN DESIGN" again.

REVISED SIZE OF BASIN
Revised width of basin (\(B_s\) in m):
Revised length of basin (\(L\) in m):
2. INPUT FOR INLET TRANSITION
Horizontal transition angle (10°-20°) (\(\theta\)):
Width of approach culvert (\(b_a\) in m):
3. INPUT FOR FORBAY
Retention time (\(t_r\) in minute):
Average height (\(H_f\) in m):
Shape of outlet Canal/Culvert (\(S_h\)):
Diameter or width of canal (Square) (\(D_o\) in m):
4. INPUT FOR OUTLET OPENING
Number of outlet opening (\(n_{out}\)):
Width of outlet opening (\(b_{out}\) in m):
Headover from opening (\(h_{open}\) in m):
5. SIDE SPILLWAY
Shape of opening (\(Shape_{open}\)):
Length of side spillway (\(L_{side}\) in m):
6. SEDIMENT FLUSHING CANAL
Depth of canal (\(h_{sf}\) in m):
Longitudinal slope of flushing canal ( \(S_{sub}\)):

DESIGN RESULTS

1. SETTLING ZONE
CALCULATED

Width of basin (\(B\)):

Length of basin (\(L\) ):

PROVIDED

Number of bays:

Width of basin (\(B_s\)):

Length of basin (\(L\)):

Depth of flow (\(h_w\)):

Depth of Settling basin excluding freeboard (\(h_s\)):

2. INLET TRANSITION

Length of inlet transition(\(L_{in}\)):

3. OUTLET OPENING

Depth of opening(\(h_o\)):

4. FORBAY

Length of forbay(\(h_{fb}\)):

Sumbergence height at oulet:

Water depth at side spillway (\(h_{spill}\)):

4. SEDIMENT FLUSHING CANAL

Velocity at flushing canal (\(v_f\)):

Size of sediment to be transported along flushing canal (\(d_m\)):