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SNODAS_Rio Grande_Report_Final
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SNODAS_Rio Grande_Report_Final
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Last modified
1/27/2010 11:13:01 AM
Creation date
7/2/2008 2:16:06 PM
Metadata
Fields
Template:
Weather Modification
Contract/Permit #
PO OE PDA 080000000125
Applicant
Riverside Technologies Incorporated
Sponsor Name
CWCB
Project Name
Adaptation of SNODAS for Water Supply Decisons in the Rio Grande Basin
Title
Adaptation of SNODAS for Water Supply Decisons in the Rio Grande Basin
Prepared For
CWCB
Prepared By
Riverside Technologies Incorporated
Date
6/30/2008
County
Hinsdale
Mineral
Rio Grande
Conejos
State
CO
Country
USA
Weather Modification - Doc Type
Report
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<br />FORECAST COMPARISON <br /> <br />· Potential Evapotranspiration (PET): RTi calculated monthly estimates of PET using the Penman- <br />Monteith method for a grass reference crop (Allen et al 1998). Land cover data from the National <br />Land Cover Dataset (NLCD) was used to select single time-averaged crop coefficients to modify the <br />PET estimates (FAO 2008). According to the NLCD, coniferous forest covers approximately half of <br />the RIODELCO basin. The remainder of the land cover includes grassland, deciduous forest, and <br />shrubland. <br /> <br />· Actual evapotranspiration (AET): AET values were calculated from PET by assuming an AET/PET <br />ratio based on expected soil moisture conditions resulting from recent precipitation and snowmelt. <br /> <br />· Runoff: Monthly runoff values were calculated from observed flow data. Water balance results did <br />not change appreciably based on whether natural or observed flows were used. Therefore, observed <br />flows were used because the available natural flow data ended in 2005. <br /> <br />· Runoff coefficient (ROC): A monthly ROC value was calculated that represents the fraction of rain <br />plus melt that converted to streamflow at the RIODELCO gage. On a monthly time scale, the values <br />are sometimes unrealistic (e.g., greater than one) because of the lag time between rain plus melt and <br />streamflow. <br /> <br />Figure 4-2 presents the monthly water balance with important terms highlighted in yellow. The monthly <br />water balance terms are aggregated to a seasonal (April-September) basis for each year. The water <br />balance enor (WB Error) was calculated as the difference between the rain plus melt reaching the soil and <br />the loss from AET and runoff. This error represents terms that are not accounted for in the water balance <br />(e.g., soil moisture changes) as well as uncertainties in the individual estimates. Although the soil <br />moisture change was not estimated, the relatively constant seasonal water balance enors may indicate that <br />the soil moisture change over the April-September period was not significant for the years included in the <br />current analysis. Overall, the seasonal water balance enors were 10-15% of the seasonal runoff values. <br /> <br />5 <br /> <br />~Riverside Technology, inc. <br />
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