Photo by Matt McPherson / The Valley ChronicleThis Valle Vista upper retention basin failed, causing a domino effect to the other smaller basins. ■ By Matt McPherson / Columnist The series of water retention basins constructed in the late 1940’s alongside the San Jacinto River play a critical role in sustaining storm flows to replenish our groundwater today. Known as the “upper basins,” both their numbers and retention capacities have been expanded in recent years to accept not only local surface water, but higher-quality imported “northern water.” The recent week-long siege of welcome rain brought the river to a point where water could be diverted into the “settling ponds’ and, in
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