Water Recharge

Capture up to 28.6 billion gallons of water per year to replenish our aquifers.

Each day, 310 million gallons of water flow down the LA River and into the ocean. We evaluated how much stormwater runoff entering the ocean could be realistically captured from the LA River and used for water recharge of aquifers.

The studies reveal that approximately 28.6 billion gallons (or 88,000 acre-feet) of total groundwater recharge could be reclaimed per year through centralized capture and infiltration projects throughout the LA River watershed, resulting in a 14% reduction in our regional water import needs.

88000 Acre Feet = (88,000 x 325,851) = 28,674,888,000 Gallons

One AF(acre-foot) is equal to one foot of water that covers one acre of land, which is equivalent to 325,851 gallons—or half an Olympic swimming pool.

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Groundwater recharge (i.e. deep drainage or deep percolation) or deep drainage or deep percolation is a hydrologic process where water moves downward through the soil from surface water to groundwater. Recharge is the primary method by which water enters an aquifer. This process usually occurs in the vadose zone below plant roots and is often expressed as a flux to the water table surface. Recharge occurs both naturally through the water cycle and through artificial groundwater recharge (anthropogenic processes) where rainwater and or reclaimed water is routed to the subsurface.

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