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Malaysia Water Research Journal<br />
level which is considered as fair. At the daily level, the model correlates well with<br />
a coefficient of determination of 83%. NS values for calibration were 0.3 for hourly<br />
and 0.26 for the daily interval. In Kampung Pertanian study, HSPF underestimated<br />
hourly and daily flows by 77% for the relative error. It can be seen that the error<br />
in Table 6 may also be attributed to less detailed hydrological survey at this area<br />
(Tetratech,2009).<br />
Figure 3: Observed and calibrated hourly streamflow at Kampung Pertanian, Kulai<br />
Table 5: Observed and simulated hourly flow and percentages<br />
Month<br />
Observed<br />
(Acre-ft)<br />
Simulated<br />
(Acre-ft)<br />
Percentage<br />
(%)<br />
November 10463.42 4863 -115.16<br />
December 8093.69 10700 24.36<br />
January 65.55 5149 98.73<br />
Total 18622.66 20712 10.09<br />
Table 6: Summary HSPF statistical analysis model results for calibration period<br />
Model Validation<br />
Statistical Hourly Daily<br />
R2 0.74 0.83<br />
ENS 0.3 0.26<br />
Relative Error (%) 76.82 77.09<br />
The calibrated HSPF model was validated from March 2012 to April 2012 and<br />
128<br />
Institut Penyelidikan Hidraulik Kebangsaan Malaysia (NAHRIM)<br />
National Hydraulic Institute of Malaysia (NAHRIM)
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