Study Area Description
Fig 2.1 shows the layout of a drainage system of a residential area. There are three subcatchments, four storm-water conduits, and four conduit junctions in it. Outlet nodes for subcatchments S-1, S-2 and S-3 are J-1, J-4 and J-5 respectively. After collection of storm-water from the system, water is finally drained to a stream at outfall O-1. The nearest and representative precipitation measuring gage for the system is RG-1.
Table 2.1 shows physical information summary of the drainage system of the study area, the data inventory of the physical elements of the system. This information is processed using GIS. More detailed network information is available in the object shape files as listed in the following section.
Table 2.1 : Physical information summary
Subcatchment Properties | ||||
Subcatchment ID | Area (acres) | Average Surface Slope (%) | Average Surface Imperviousness (%) | Outlet Node ID |
S-1 | 4.18 | 1.43 | 47.25 | J-1 |
S-2 | 4.03 | 3.13 | 46.10 | J-4 |
S-3 | 3.31 | 2.20 | 38.30 | J-5 |
System | 11.52 | 2.25 | 44.28 | O-1 |
Conduit Properties | ||||||
Conduit ID | Inlet Node ID | Outlet Node ID | Material | Cross-section Type | Diameter (ft) | Length (ft) |
C-1 | J-1 | O-1 | PVC | Circular | 1.5 | 154.47 |
C-2 | J-2 | J-1 | Concrete | Circular | 1.5 | 481.80 |
C-3 | J-3 | J-2 | PVC | Circular | 1.5 | 190.78 |
C-4 | J-4 | J-3 | PVC | Circular | 1.0 | 87.48 |
C-5 | J-5 | J-3 | PVC | Circular | 1.0 | 86.27 |
Total Length | 1000.80 | |||||
Junction Properties | |
Junction ID | Invert Elevation (ft) |
J-1 | 480.48 |
J-2 | 494.43 |
J-3 | 501.83 |
J-4 | 537.64 |
J-5 | 526.29 |
Outfall Properties | |
Outfall ID | Invert Elevation (ft) |
O-1 | 470.57 |