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<br />fjIJr)~ 5~ <br /> <br />Accumulated Inflow <br /> <br />The accumulated inflow is the accumulated amount of water that has entered a <br />reservoir to date, During the spring runoff season, much of this water is snowmelt, <br />Mter the snowmelt runoff has subsided, inflow returns to base flow, which is <br />maintained through natural streamflow from springs and other subsurface releases. <br />Information about reservoir inflow allows reservoir operators to schedule reservoir <br />releases to meet downstream requirements and, at the same time, hold back enough <br />carryover storage for next year's needs, <br /> <br />During drought, the amount of accumulated inflow to a reservoir is reduced and often <br />requires a reduction in releases for downstream needs-a rationing of water. <br />(Instantaneous inflow, the amount of water entering a reservoir at a particular point <br />in time, is not the same as accumulated inflow, It is, nonetheless, an important <br />measurement at some Reclamation reservoirs, where water deliveries in water-short <br />years may be regulated by the instantaneous inflow on a particular date,) <br /> <br />During 1990, an early warming trend advanced the snowmelt; therefore, runoff <br />peaked early and the accumulated inflow into many Reclamation reservoirs fell off <br />earlier in the season than usuaL By the end of June, reservoir inflow was severely <br />below average in the Central Valley of California and in the Colorado River Basin. <br /> <br />18 <br />