180 
Ganl. Bull. Singapore 70 (Suppl. 1) 2018 
15 / 05/2013 
15 / 09/2013 
15 / 01/2014 
Date 
15 / 05/2014 
15 / 09/2014 
250 
200 
150 
S’ 
£ 
E 
cc 
50 
B 
Fig. 3. Simulated vs. observed water depths (a: Upper stream gauge; b: Mid stream gauge). 
Model Application 
Impacts of climate change 
The numerical model, as shown in the previous section, having been calibrated based 
on field measurements, is applied to assess the climate change impacts by simulating 
future scenarios. The future scenarios, as defined in Table 2, combine the effect of two 
factors: reservoir level and rainfall. Reservoir level is categorised as low, medium or 
high, respectively represented by bottom, mean and top operating levels as managed 
by the responsible government agency. Rainfall scenarios comprise no rainfall, low, 
medium and high rainfall conditions. Future rainfall is projected from the numerical 
climate model formulated as 
