Optimization of an artificial-recharge–pumping system for water supply in the Maghaway Valley, Cebu, Philippines

Kawo, NafyadSerre; Zhou, Yangxiao; Magalso, Ronnell; Salvacion, Lasaro

Optimization of an artificial-recharge–pumping system for water supply in the Maghaway Valley, Cebu, Philippines | Optimisation d’un système recharge artificielle – pompage pour l’alimentation en eau de la vallée de Maghaway, Cebu, Philippines Optimización de un sistema de bombeo de la recarga artificial para el suministro de agua en Maghaway Valley, Cebu, Filipinas 菲律宾宿务岛塔里萨伊市河谷中供水人工补给-抽水系统的最优化 Otimização de um sistema de bombeamento de recarga artificial para o fornecimento de água no Vale Maghaway, Cebu, Filipinas

2018

Kawo, NafyadSerre | Zhou, Yangxiao | Magalso, Ronnell | Salvacion, Lasaro

A coupled simulation-optimization approach to optimize an artificial-recharge–pumping system for the water supply in the Maghaway Valley, Cebu, Philippines, is presented. The objective is to maximize the total pumping rate through a system of artificial recharge and pumping while meeting constraints such as groundwater-level drawdown and bounds on pumping rates at each well. The simulation models were coupled with groundwater management optimization to maximize production rates. Under steady-state natural conditions, the significant inflow to the aquifer comes from river leakage, whereas the natural discharge is mainly the subsurface outflow to the downstream area. Results from the steady artificial-recharge–pumping simulation model show that artificial recharge is about 20,587 m³/day and accounts for 77% of total inflow. Under transient artificial-recharge–pumping conditions, artificial recharge varies between 14,000 and 20,000 m³/day depending on the wet and dry seasons, respectively. The steady-state optimisation results show that the total optimal abstraction rate is 37,545 m³/day and artificial recharge is increased to 29,313 m³/day. The transient optimization results show that the average total optimal pumping rate is 36,969 m³/day for the current weir height. The transient optimization results for an increase in weir height by 1 and 2 m show that the average total optimal pumping rates are increased to 38,768 and 40,463 m³/day, respectively. It is concluded that the increase in the height of the weir can significantly increase the artificial recharge rate and production rate in Maghaway Valley.

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