Middle Week Report – Team 3
In the first day of work, all the teams received the information needed to start constructing the model in
SWMM 5.0, like a plan of the studied area (a drawing in AutoCad), the existing rainfalls to calibrate and
validate the model and a google image to verify details of the area.
The studied area is called “La Riereta” and is located in Sant Boi de Llobregat, Catalunya, Spain.
This catchment has a surface area of approximately 17 ha and it presents high indexes of impermeability.
Its slope varies from high to medium values. Roof drainage discharges directly to the streets through
downspouts. Additionally, a group of inlets distributed in the streets ensure the collection of the generated
runoff after the occurrence of rainfall.
The drainage system of “La Riereta” is a combined sewer network and it is mainly composed by circular
cross-section pipes with different diameters and made by concrete.
Team 3 started working with a brief analysis of the drawing in AutoCad, corresponding to the plan view of
La Riereta. The team focused on the elements of the existent drainage network and the flow directions.
The following steps were:
-
Definition of the principal catchment;
Definition of the sub-catchments;
Analysis of the corresponding inflow of each node;
Collection of information of each sub-catchment, such as: area, slope, perviousness and roughness.
Team 3 defined 17 sub-catchments with an approximate area of 1 ha. Figure 1 shows this division:
Figure 1. Division of sub-catchments
The studied catchment has at about 85% of impervious area.
In the second day of work, Team 3 finished the data collection, using the information given in AutoCad, on
the catchment plan, for conducts and manholes.
Collected data were:
-
Conducts: identification of upstream and downstream nodes and their respective elevations;
conduct length and conduct diameter.
Manholes: identification of maximum depth and elevations.
After that, the group started using SWMM, drawing the proposed network with all its components: subcatchments, conducts, manholes (junctions), outlet and pluviometer.
Figure 2 shows the studied area in SWMM.
Figure 2. Studied area in SWMM
With the entire drainage network in SWMM, the following step consisted in inputing data related to its
elements. The dynamic wave routing method was chosen.
Three different rainfall events (Table 1), with their corresponding flows – measured at the catchment
outfall – were assigned for each group. Each of these events is identified by the name of the saint of the
day in which the registration started.
Table 1. Rainfall events assigned for Team 3
Rainfall event – Team 3
Efrén
Santa Cecilia
Susana
Figure 3. Rainfall event – Santa Cecilia
Figure 4. Rainfall event – Efren
Figure 5. Rainfall event – Susana
The chosen rainfall events for calibration of the model were: Susana and Efrén. The resulting hydrographs
are showed in Figures 4 and 5.
Susana Rainfall Event
0.5
0.45
0.4
0.35
0.3
0.25
0.2
0.15
0.1
0.05
0
0
10
20
30
Measured flow(m3/s)
40
50
Calculated flow (m3/s)
Figure 6. Calibration of the model with Susana rainfall event
Efrén Rainfall Event
0.5
0.45
0.4
0.35
0.3
0.25
0.2
0.15
0.1
0.05
0
0
20
40
60
80
100
120
140
Measured flow (m3/s)Time [min]Calculated flow (m3/s)
Figure 7. Calibration of the model with Efrén rainfall event
Santa Cecilia rainfall event was used to validate the model. The corresponding hydrograph is showed on
Figure 6.
Santa Cecilia Rainfall Event
0.5
0.45
0.4
0.35
0.3
0.25
0.2
0.15
0.1
0.05
0
0
10
20
30
40
Measured flow (m3/s)
50
60
70
80
90
100
Calculated flow (m3/s)
Figure 8. Validation of the model with Santa Cecilia rainfall event
After the calibration and validation of the model, the adopted parameters for sub catchments, conducts
and junctions were, respectively:
Table 2. Parameters adopted for sub catchments
Name
S06
S12
S13
S01
S02
S03
S05
S07
S08
S09
S4A
S4B
S4C
S10A
S10B
S11B
S11A
S14A
Raingage
Pluv1
Pluv1
Pluv1
Pluv1
Pluv1
Pluv1
Pluv1
Pluv1
Pluv1
Pluv1
Pluv1
Pluv1
Pluv1
Pluv1
Pluv1
Pluv1
Pluv1
Pluv1
Outlet
N12
N9
N2
N13
N14
2
N12
N11
N11
N6
N10
N10
N10
N7
N15
N16
N9
N4
Total
Area
0.5
0.66
2.06
0.77
0.44
1
0.66
0.55
0.9
0.69
0.6
0.09
0.5
0.87
0.57
1.1
0.95
0.2
Pcnt.
Imperv
81.16
94.87
90.73
87.8
92.23
71.73
84.08
98.06
88.5
92.64
89.3
89.3
89.3
96.37
96.37
95.97
95.97
95.3
Width
500
660
2060
770
440
1000
660
550
900
690
600
90
500
870
570
1100
950
200
Pcnt.
Slope
2.28
1.52
4.09
6.63
3.16
4.65
1.9
4.09
4.39
6.46
2.34
2.34
2.34
4.72
4.72
4.01
4.01
5.49
Curb N-Imperv N-Perv S-Imperv
Length
0.65
0.15
0.04
0
0.65
0.15
0.04
0
0.65
0.15
0.04
0
0.65
0.15
0.04
0
0.65
0.15
0.04
0
0.65
0.15
0.04
0
0.65
0.15
0.04
0
0.65
0.15
0.04
0
0.65
0.15
0.04
0
0.65
0.15
0.04
0
0.65
0.15
0.04
0
0.65
0.15
0.04
0
0.65
0.15
0.04
0
0.65
0.15
0.04
0
0.65
0.15
0.04
0
0.65
0.15
0.04
0
0.65
0.15
0.04
0
0.65
0.15
0.04
0
S-Perv
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
2.6
PctZero RouteTo
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
OUTLET
OUTLET
OUTLET
OUTLET
OUTLET
OUTLET
OUTLET
OUTLET
OUTLET
OUTLET
OUTLET
OUTLET
OUTLET
OUTLET
OUTLET
OUTLET
OUTLET
OUTLET
Table 3. Parameters adopted for conduits
Name
C2
C4
C6
C7
C9
C10
C11
C12
C13
C14
C5
C8
C15
C16
C12A
Inlet
Node
N2
N4
N6
N7
N9
N10
N11
N12
N13
N14
N5
N8
N15
N16
2
Outlet
Node
N4
N5
N7
N8
N11
N11
N12
2
N14
1
N9
N9
N7
N9
N14
Length
70.86
50.56
80.59
59.12
123.33
61.14
108.06
36
120.34
45.52
64.88
10.73
105
145
50
Manning
N
0.013
0.013
0.013
0.013
0.013
0.013
0.013
0.013
0.013
0.013
0.013
0.013
0.013
0.013
0.013
Inlet
Offset
30.89
23.33
26.46
24.57
21.46
21.73
15.46
15.7
16.22
13.13
22.31
23.18
28.518
26.193
14
Outlet
Offset
24.18
22.51
24.57
23.28
15.46
18.06
15.9
14.2
13.73
12.51
21.46
22.87
24.574
22.87
13.13
Init.
Flow
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Max.
Flow
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Link
C2
C4
C6
C7
C9
C10
C11
C12
C13
C14
C5
C8
C15
C16
C12A
Shape
Geom1
CIRCULAR
0.5
CIRCULAR
0.4
CIRCULAR
0.4
CIRCULAR
0.4
CIRCULAR
1
CIRCULAR
0.3
CIRCULAR
1
CIRCULAR
1
CIRCULAR
0.6
CIRCULAR
1.2
CIRCULAR
0.6
CIRCULAR
0.5
CIRCULAR
0.5
CIRCULAR
0.6
CIRCULAR
1.2
Geom2
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Geom3
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Geom4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Barrels
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Table 4. Parameters adopted for junctions
Name
N2
N4
N6
N7
N9
N10
N11
N12
N13
N14
N5
N8
N15
N16
2
Invert
Elev.
30.696
23.33
26.263
24.57
21.46
21.725
15.46
15.7
16.22
13.13
22.31
23.17
28.518
26.193
14
Max.
Depth
0
0
0
0
0
0
4
0
0
0
0
0
0
0
0
Init. Surcharge Ponded
Depth
Depth
Area
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0