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<br />I <br /> <br />~ <br /> <br />, , <br /> <br />'. <br /> <br />. <br /> <br />0753 <br /> <br />determined by noting the time when the first perceptible rise in stage <br />occurred on the gage height charts for either the "near Pueblo" <br />(07099500) or "Avondale" (07109500) gaging stations, and adding to this <br />a computed time of travel from these stations to the canal headgates. <br />This computed time of travel from these two stations to the canal head- <br />gates was based on field measurements of mean river velocity at various <br />river discharges. <br /> <br />Figure 3 also notes that for releases from Turquoise Lake 4~ hours <br />must be added, and for releases from Clear Creek Reservoir 2~ hours <br />must be subtracted, to determine travel time to the Colorado Canal <br />headgate. These figures are based on field observations, streamflow <br />measurements, and gaging-station records. <br /> <br />The discharge scale on figure 3 shows the streamflow at the "near <br />Wellsville" gaging station (07093700) immediately prior to the time of <br />release. The discharge at this particular station was chosen as an <br />index for the entire reach for the following reasons: (1) analysis of <br />past records indicated the discharge at the "near Wellsville" station <br />best approximates the average flow in the reach, (2) this gaging station <br />is equipped with an instrument by which the stage can be determined by <br />telephone, (3) the stage-discharge relationship is relatively stable, <br />and (4) there are no diversions which bypass the station. The stage <br />discharge relationship for this gaging station is given in table 2. <br /> <br />SOURCES OF TRANSPORTATION LOSS <br /> <br />Colorado water law allows owners of reservoirs to use natural <br />streams to transport their water provided allowances are made for transit <br />losses (Radosevich and Hamburg, 1971), Transportation loss, or transit <br />loss, refers to released water that cannot be utilized at the downstream <br />delivery point. The transit loss currently being charged for the Arkan- <br />sas River is 0.07 percent of the reservoir release per mile of river. <br /> <br />Reservoir releases down the upper Arkansas River typically range <br />from 300 to 500 ft3fs for a duration of from 6 to 14 days. During these <br />periodn, the release water can temporarily be retained in channel and <br />bank storage, inadvertently diverted, or evapotranspired. Only evapo- <br />transpiration removes water from the stream system and, therefore, can <br />be considered a true loss. Channel storage, bank storage, and inadvert- <br />ent diversions mayor may not be other sources of transportation loss. <br /> <br />During the past 2 years, a careful. study has been made of channel <br />and bank storage, inadvertent diversions, and evapotranspiration, and <br />their effects on reservoir releases from Twin Lakes Reservoir to the <br />Colorado Canal headgate. The following discussions report the findings <br />of this study. <br /> <br />9 <br />