Laserfiche WebLink
<br />I <br /> <br />I <br /> <br />I <br /> <br />7. LITTLE CREEK/LEE GULCH STUDY <br /> <br />Client(s): KKBNA Consulting Engineers <br /> <br />I <br /> <br />I <br /> <br />WRC developed 60 storm hydrographs for the 10-, 50-, and 100-year frequency <br /> <br /> <br />storm. A 3-hour design storm with 5-minute time intervals was used. To <br /> <br /> <br />develop the hydrographs, a detailed hydrologic analysis was performed to in- <br /> <br /> <br />clude: rainfall duration and frequency analysis, soil analysis and infiltration <br /> <br /> <br />loss, detention and depression losses, effective precipitation for different <br /> <br /> <br />land uses, basin parameters affecting runoff, land use data, and use of the <br /> <br /> <br />synthetic hydrograph method to develop the storm hydrographs. <br /> <br />I <br /> <br />I <br /> <br />8. SOUTH ARKANSAS RIVER AND PONCHA CREEK STUDY <br /> <br />I <br /> <br />I <br /> <br />Client(s): Colorado Water Conservation Board <br />Chaffee County, Colorado <br />Town of Poncha Springs <br /> <br />I <br /> <br />Collected hydrologic data including rainfall, snowfall, peak streamflow, <br />temperature, and precipitation. 'Analyzed hydrologic data and determined rain- <br />fall/runoff and snowmelt/runoff relationships. Performed detailed hydrologic <br />analysis by using four different methods to determine the 10-, 50, 100-, and <br />500-year flood discharges at selected design points within the study area. <br />The four different methods included the U.S. Geological Regional Analysis, <br />Regional Statistics, Regional Log-Pearson Type III Analysis, and the Colorado <br />Water Conservation Board method which is outlined in Technical Manual No.1. <br />Delineated the 100-year floodplain using the U.S. Army Corps of Engineers Water <br />Surface Profile computer program (HEC-2).. <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />9. WELD COUNTY BRIDGES HYDRAULIC DESIGN <br /> <br />I <br /> <br />Client(s): Matrix Engineers, Inc. <br /> <br />I <br /> <br />WRC provided hydrologic and hydraulic analyses necessary to design new <br /> <br /> <br />bridges for Weld County Roads 17 and 54 crossing of the Big Thompson River. <br /> <br /> <br />Hydrology was developed from existing published floodplain information reports. <br /> <br /> <br />Backwater analyses were performed to assess the effect of various bridge lengths <br /> <br /> <br />and clearances. pier scour, channel stability, and revetment protection were <br /> <br /> <br />analyzed. <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />-9- <br />