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<br />., <br /> <br />-6- <br /> <br />Current online mapping products are: <br />. SWE & Basin average SWE <br />. SWE Change & Basin average SWE change <br />. Snow depth & Basin average Snow depth <br />. 24 hour snowmelt & Basin average 24 hour snowmelt <br />. 24 hour snowpack temperature & 24 hour snowpack temperature average <br /> <br />. <br /> <br /> Enhanced Snowuack Assessment (SNODAS) Totals - Mav 10. 2005* <br />Units are in Inches <br /> Arkansas Colorado Gunnison North Platte Rio South San Juan Yamp. White <br /> Grande Platte <br />sWE 0.77 4.09 3.77 3.19 3.25 1.72 2.69 1.41 2.8 <br />SWE chan;e 0.01 0.08 0.03 0.10 0.0. 0.04 0.0 0.02 0.03 <br />Snow depth Basin 2.3 11.23 8.95 8.53 8.30 5.18 6.81 3.82 5.77 <br />Averaae' <br />Snowmelt Basin Avera;; 0.45 0.55 0.62 0.56 0.61 0.48 D.63 0.59 0.66 <br /> <br />· SNODAS calculations accounl for all oflhe square kilometers ofteITain in a basin and is not just an average of all oflhe <br />SNOTEL sites near the basin. Therefore basin average are much less than NRCS basin averages and potentially more accurate. <br /> <br />Recent research and development in this progress has centered around the NRCS enhanced SNOTEL sensors. We <br />need to use soil saturation as an indicator of peak run off and flood threat potential. For instance the soil moisture <br />sensors in the Rio Grande in early May had readings of nearly 45%. Readings of 45% are considered close to <br />satUration "and enable more run off. There are about 22 SNOTEL sites that measure soil moisture and we will need <br />to use this in conjunction with modeled soil moisture to help determine our snowmelt flood threat and as input for <br />our streamflow forecasts. <br /> <br />Recently staff presented to the ACEC, a group of consulting engineers that meets to discuss technical issues. we. <br />are receiving funding for a Phase II link to hydrologic models on July 1, 2005 and will set out to utilize SNODAS <br />model runs for a lkm distributed hydro model. During the summer of2004 we received initial funding and <br />modeled the snowpack of the winter of2003-2004 after the fact. We may choose to do the same this summer, use <br />the modeled 2004-2005 snowpack and develop streamflow forecasts for the 2005 spring season. This will enable us <br />to compare modeled information to actual streamflows and see if the estimates are "in the ball park". Weare <br />working towards having modeled streamflow forecasts for spring 2006 to compliment the existing suite of products <br />being developed. <br /> <br />G. Conclusion <br /> <br />The purpose of this agenda item is to inform the Board regarding staff activities and to provide an update regarding <br />potential spring and early summer snowmelt flooding issues in Colorado. Staff is not requesting formal Board <br />action for this agenda item. <br /> <br />This is my 201 st and final board meeting as a CWCB staff member. Flooding potential, flood awareness, flood <br />preparedness, flood fighting, flood recovery, and flood mitigation projects/activities have provided me with many <br />challenges and rewarding experiences. The floods will continue to occur, request for help will come to the Board, <br />and I am confident that these requests for assistance will be addressed in an outstanding manner by the remaining <br />flood staff members. Spring 2005 is my last opportunity to monitor "How high is the water?" I thank the CWCB <br />and its Board Members for their support and assistance over the years. <br /> <br />. <br /> <br />Flood Protection. Water Project Planning and Finance. Stream and Lake Protection <br />Water Supply Protection. Conservation Planning <br />