Water balance estimation for the San Juan Subwatershed, Laguna de Bay Basin, Philippines
2017
Angeles, B.M.
Hydrological approaches were performed to estimate the water balance in San Juan Subwatershed during 2015. As water inflow, the total precipitation (P) volume (2,711,418,712 cu m) was computed through Inverse Weighted Distance (IWD) and Thiessen Polygon methods. The 61,381 cu m infiltration (I) and 1,158,915,990 cu m evapotranspiration (ET) were determined through equations of Holtan and Thornthwaite, respectively. The HEC-HMS 4.2 simulated 2,240,820 cu m run-off (Q) for the watershed. Consequently, the water balance was represented by P = I + Q + ET. During January to June, water outflow (I, Q and ET) exceeded the amount of inflow (P). However, precipitation volume was higher than outflow during July to December. As result of the annual water balance, 1,527,200,522 cu m of water was stored in the watershed. The research estimated baseflow (BF) through baseflow recession curve and combined it to Q as surface water resources. The baseflow (40,996,800 cu m) was added to total Q and compared with the 182,354 cu m/day water consumption of the industrial, agricultural and domestic sectors. The volume of water consumption at 10,110,083 cu m exceeded the surface water resources during January to June. Nevertheless, surface water resource production was higher than the consumption during July to December at 9,788,472 cu m.
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