Description of Study Area
The study area, having an area of 48.8 acres, is primarily a developed urban land that has a coarse loamy soil type. With the exception of the depressions located in the parkland area, no major changes in topography are found in the study area due to the development. This implies that all the streets, in general, followed the natural slope. The study area site is shown in Figure 2.1. The rainfall time series for the 0.1 and 0.19 inch storm events are shown in Table 2.2.
Table 2.2 : Rainfall Time Series for the 0.1 and 0.19 Inch Storm Events
Time | 0.1in Storm(in./h) | 0.19in Storm(in./h)1 | Time | 0.1 in Storm(in./h) | 0.19 in Storm(in./h)1 |
|---|---|---|---|---|---|
0:00 | 0.030 | 0.056 | 1:00 | 0.020 | 0.038 |
0:05 | 0.034 | 0.063 | 1:05 | 0.019 | 0.036 |
0:10 | 0.039 | 0.073 | 1:10 | 0.018 | 0.035 |
0:15 | 0.065 | 0.123 | 1:15 | 0.017 | 0.033 |
0:20 | 0.083 | 0.155 | 1:20 | 0.017 | 0.033 |
0:25 | 0.160 | 0.301 | 1:25 | 0.016 | 0.031 |
0:30 | 0.291 | 0.547 | 1:30 | 0.015 | 0.029 |
0:35 | 0.121 | 0.226 | 1:35 | 0.015 | 0.029 |
0:40 | 0.073 | 0.136 | 1:40 | 0.014 | 0.027 |
0:45 | 0.043 | 0.081 | 1:45 | 0.014 | 0.027 |
0:50 | 0.036 | 0.067 | 1:50 | 0.013 | 0.025 |
0:55 | 0.031 | 0.058 | 1:55 | 0.013 | 0.025 |
NB: 0.19 in. storm corresponds to the WQCV.
These new hyetographs are defined in GeoSWMM using its Time Series Editor. The names of the new rainfall series will be 0.1-in and 0.19-in, respectively. They will be used by the model’s single rain gage in addition to the 2-yr, 10-yr and 100-yr storms. Although, this tutorial will only employ the 2-yr storm along with the 0.1 in. and 0.19 in. events.