<p><strong>A 3-D Model of Surface Water and Groundwater Interaction in the Central Passaic River</strong></p><p><strong>Basin, New Jersey</strong>.</p><p>&#160;</p><p>Duke U. Ophori</p><p>Department of Earth and Environmental Studies</p><p>Montclair State University</p><p>Upper Montclair</p><p>New Jersey 0743</p><p>Ph: (973) 464 6238, Email: [email protected]</p><p>&#160;</p><p><strong>Abstract</strong></p><p>&#160;</p><p>Hydrogeologists have believed, over the years, that the development of a groundwater basin results in increase in the basin&#8217;s groundwater recharge and decrease in discharge. This basin&#8217;s response to development is intricately tied with the natural recharge-discharge behavior of regional groundwater flow systems. A 3-D regional groundwater flow model is developed for the Central Passaic River Basin, New Jersey to evaluate its surface water-groundwater interactions. The models show that groundwater pumping increases recharge and decreases discharge in the basin. Groundwater-fed wetlands are reduced in size by groundwater pumping. These findings will enhance groundwater management in the basin.</p>