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<br />OQ173~ <br /> <br />The claimed streamflow is the minimum amount necessary to transport all of the bedload <br />sediment through the selected reaches, thereby preventing long term accumulation of sediment <br />and associated reduction in channel size, and maintaining the ability of the channels to transport <br />the mass and size classes of available sediment, The claimed streamflow is less than all of the <br />streamflow because the fmer size classes of sediment are supply,limited. 3 While sediment <br />historically moved by unclaimed low flows will temporarily accumulate in the channels. the <br />claimed high flows have the ability to move the temporarily accumulated finer sediment such <br />that the ability of the channels to pass flows and convey water to downstream users is maintained <br />over the long-term. <br /> <br />Each channel maintenance claim is defined by a claim initiation stream discharge, an <br />upper limit, and a period of use. No streamflow is claimed if streamflow is below the claim <br />initiation discharge. If stream discharge is equal to or above the claim initiation stream discharge <br />and equal to or less than the upper limit. all of the streamflow is claimed, If streamflow is above <br />the upper limit only the streamflow equal to the upper limit is claimed. No streamflow is <br />claimed during the months of August and September. <br /> <br />The discharge at which the claims are initiated is determined from the historical record of <br />daily discharges, the relationship between discharge and the bedload transport rate, and the <br />relationship between the cumulative quantities of bedload and water transported over the period <br />of record. The claims are initiated at the streamflow below which 30 percent of the cumulative <br />amount of bedload is moved. All of the streamflow is claimed above this initial discharge up to <br />the flood discharge having a recurrence interval of 25 years, commonly termed the 25-year flood. <br /> <br />The structure of the claim is such that more water is claimed in wetter years with high <br />flows and little or no water is claimed during drought years when demands on this scarce <br />resource are higher. The streamflows claimed are typically the higher discharges that occur for a <br />short period of time during the spring snowmelt runoff. The average amount of water claimed is <br />30 percent of the annual streamflow and the average duration of the claims is 28 days per year. <br />The channel maintenance claims are non-consumptive and all the streamflow is available to <br />downstream appropriators and uses. Because no claim is made in August and September, all the <br />water is available for agricultural and other users during those months. <br /> <br />3 Supply limited refers to a condition in which the availability of sediment is less than the ability of the <br />stream to transport sediment. <br /> <br />United Slates' Expert Report Disclosing Methodoiogies for Quantification of O'1lanlc Ad Claims Consolida1lld Subcase No, 63-25243 <br /> <br />ii <br />