modeling or water balance estimations for groundwater management. Based on field observations and the available database, a new conceptual model for groundwater flow and recharge was proposed.

Between May 2001 and February 2002, some initiatives leading to improvements in the data base were initiated and some completed. The degree of uncertainty related with actual aquifer geometry and surface/groundwater interactions however remained.

A 3D model of the Aquifer was developed to use as a tool in indicating priorities for data gathering, and to test the validity of different recharge scenarios. As it was based on a limited database, the model should not be considered as a groundwater management tool. The modeling exercise indicated that an important portion of the aquifer’s recharge could be happening along the Talomo River. The results highlighted the importance of assessing surface water/groundwater interactions, particularly in the Talomo River.

The recommendations are to improve the data base on aquifer geometry by conducting a survey of the numerous private wells, and by consulting a geophysicist specialized in aquifer characterization to determine the best method to improve aquifer delineation. To allow the quantification of recharge in rivers, the database on stream flow should continue and monitoring of the water levels in wells should be initiated, particularly near rivers. Monitoring of water quality at the point of discharge in the river of waters potentially affected by industrial activities is also recommended.

While the database is being improved to a level sufficient to support credible estimations of recharge areas and safe aquifer yield, the groundwater extraction rate continues to increase. Regular measurements of water levels in wells thought the watershed is recommended to monitor potential changes in aquifer storage. Monitoring of water quality in wells at the shoreline is also recommended to detect changes in the interference with saline water.