From the Results page of the Analyse Gravity Network dialog box, you can output a .csv file which contains the results of the gravity network analysis.
The report is output in a format that is generally similar to computation sheets in the Urban Drainage Design Manual Third Edition, Hydraulic Engineering Circular No. 22 (HEC-22), published by the US Department of Transportation Federal Highway Administration.
The first set of rows in the table generally follows the data format of HEC-22 Figure 7-8, the storm drain computation sheet. This section is included in the report if you selected Compute Energy and Hydraulic Gradient Lines or Resize Pipes and Reset Inverts on the General page of the Analyse Gravity Network dialog box.
The following data is included in this section of the report:
| #Line | Pipe | From | To | Length | Drainage Area Inc | Drainage Area Total | Runoff Coeff "C" | "Area" X "C" Inc | "Area" X "C" Total | Time of Concentration Inlet | Time of Concentration System | Rain "I" | Runoff "Q" | Known Q | Total Q | Pipe Dia. | Full Q | Velocity Full | Velocity Design | Sec Time | Invert Level U/S | Invert Level D/S | Soffit Drop | Slope |
The second set of rows in the table generally follows the data format of HEC-22 Figure 7-10, the energy gradient line computation sheet – Table A. This section is included in the report if you selected Compute Energy and Hydraulic Gradient Lines on the General page of the Analyse Gravity Network dialogue box.
The following data is included in this section of the report:
| #Line | Struct. ID | D | Q | L | V | d |
dc |
v2/2g |
EGLo |
HGLo |
Sf |
Total Pipe Loss |
EGLi |
HGLi |
Ea |
EGLa |
U/S TOC | Surface Level. |
The third set of rows in the table generally follows the data format of HEC-22 Figure 7-11, the energy gradient line computation sheet – Table B. This section is included in the report if you selected Compute Energy and Hydraulic Gradient Lines on the General page of the Analyse Gravity Network dialogue box.
The following data is included in this section of the report:
| #Line | Struct. ID |
Exit Ho |
Hf |
Hb |
Hc |
He |
Hj |
Total |
Ei |
y+(P/γ) |
DI |
Eai |
CB |
Cθ |
Cp |
Ha |
Ea |
The fourth set of rows in the table generally follows the data format of HEC-22 Figure 4-19, the inlet spacing computation sheet. This section is included in the report if you selected Inlet Analysis on the General page of the Analyse Gravity Network dialog box.
The following data is included in this section of the report:
| No. | Name | Stat. | Drain. Area A | Runoff Coeff. C | Time of Conc. | Rainfall Intens. |
Q=CIA/Kc |
Known Q |
Long Slope SL |
Crossfall Sx |
Crossfall Sw |
Prev. Bypass Flow | Total Channel Flow | Depth d | Channel Width | Spread T | W/T | Inlet Type | Gully Length | Gully Width | Kerb Opening Length | Kerb Opening Height |
Intercept Flow Qi |
Bypass Flow Qb |
Bypass Structure | Remark |