Figure legends
Figure 1. Root intrusion through cracks and joints of sewer pipes as
examples of sewer infiltration passage (Urbana Champaign Sanitary
District, 2012)
Figure 2. Rainfall and sewer flow data (a) rainfall record from ISWS (b)
sewer flow data from USGS sewage monitoring site in the period of April
17–August 3, 2009
Figure 3. Impulse response functions from the roof connection, sump
pump, and leaky lateral models with the representative rainfall
expressed as flow discharge per unit contribution area
Figure 4. Long term RDII responses of roof connection, sump pump, and
leaky lateral using exceedance probability of three RDII responses per
unit area in log scale in the period of April 17–July 16, 2009
Figure 5. Three RTK triangular hydrographs from 30 different model runs
Figure 6. Box plots of RTK solutions
Figure 7. Calibrated IRF and the best RTK results in the (a) calibration
period (May 9, 2009 to June 7, 2009) and the (b) validation period (June
9, 2009 to July 8, 2009)
Figure 8. Residual plots of IRF and RTK methods for (a) calibration
period and (b) validation period