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<br />VI - HYDROLOGIC FORECASTS
<br />
<br />6-()1. General. Hydrologic forecasts are necessary in pre-
<br />dicting streamflow above or below a project to determine if or
<br />wh..n releases should he made. However, the characteristics of
<br />th.. hasin above the Pueblo Dam and Reservoir does not necessitate
<br />forecasting for flood control.
<br />
<br />a. Role of Bureau of Reclamation. The Bureau of
<br />Reclamation will make long-range forecasta to predict the amount
<br />of water available for conservation usage within the Arkansas
<br />River Basin and that to be diverted from the Fryingpan River
<br />Basin. Although the National Weather Service is reaponsible
<br />for furnishing weather and flood forecasts to the public, the
<br />Bureau of Reclamation will aid in dissemination of factual infor-
<br />mation of lake levels, ~eather, streamflow, or any other available
<br />information on observed conditiona.
<br />
<br />b. Role of Corps of Engineers. Hydrologic forecasts
<br />by the National Weather Service will be utilized by the Albuquerque
<br />District in the regulation of reservoirs for flood control and
<br />flood-fip,hting activities. Further discussion of the role of the
<br />Corps of Engineers is presented in Section III of the ~~ster
<br />Regulation Manual.
<br />
<br />c. Role of Other Agencies. The National Weather Sl'rvlcl'
<br />prepares ...eather and flood forecasts and makes the information
<br />avdl ahle to Federal, State, and local agencies and to the public.
<br />The snowmelt forecasts are a joint effort of the Soil Conaervation
<br />SerVice and National Weather Service. The role of other agencies
<br />is discussed in Section VII of the Master Regulation Manual.
<br />
<br />6-02. Flood Forecasting.
<br />
<br />a. Above Pueblo Dam. Due to the hydrometeorological
<br />conditions, it is extremely difficult to forecast storm runoff
<br />using unit' hydrographs, rainfall, and losses. It is anticipated
<br />all flood forecasting ~ill be done by routing the observed flows
<br />Canon City and/or Portland gages to the Pueblo Dam and Reservoir
<br />by the Tatum method of routing (successive average-lag method).
<br />resulta of the preliminary study are listed below.
<br />
<br />that
<br />at
<br />
<br />The
<br />
<br />(1) Caiion City to Portland - The travel time of the
<br />penk flow was determined to he spproximately 4 hours. A "-hour routinf',
<br />period was chosen Ilnd resulted in the use of 4 tatum ruutin!', ateeps.
<br />
<br />(:!)
<br />was determined
<br />was chosen and
<br />
<br />Portland to Pueblo - The travel time of the peak flow
<br />to be approximately 3.5 hours. . A 2-hour routing period
<br />resulted in the USe of 4 tatum routing steeps.
<br />
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