Laserfiche WebLink
<br />SEITIIITHREE <br /> <br />Greelev <br /> <br />3.2 STORM EVENT DATA <br /> <br />3.2.1 Precipitation Data <br /> <br />The National Climatic Data Center indicates that from 3- to 5-inches of rainfall fell in less than <br />two hours on July 13th. The Greeley Tribune reported rainfall amounts of 3.48 inches. A <br />comparison between this data and precipitation-duration-frequency curves (Figure 3.2-1 <br />developed from the u.s. Department of Commerce, NOAA Atlas 2, Volume III-Colorado) <br />indicates that the precipitation that occurred in this area is equivalent to at least a 2-hour, 100- <br />year frequency event. <br /> <br />Figure 3.2-1 <br />Precipitation-Duration-Frequency Curves for Greeley, Colorado <br /> <br /> Greely <br /> 6.0 <br />C 5.0 --+- 2 <br />- <br />5 4.0 ---- 5 <br />; <br />~ 3.0 ---.- 1 0 <br />c. 25 <br />(.) 2.0 <br />Q) --7IE- 1 00 <br />... <br />D.. 1.0 <br /> 0.0 <br /> 0 5 10 15 20 25 30 <br /> Duration (hr) <br /> <br /> <br /> <br />3.2.2 Flow Data <br /> <br />The USGS web site contains no flood data for the Cache la Poudre River, Lonetree Creek, or any <br />other creeks in the Greeley area. <br /> <br />3.3 EXTENT OF FLOODING <br /> <br />3.3.1 Affected Streams and Local Drainage Areas <br /> <br />As mentioned, the reports of flooding focused on the streets of the city rather than particular <br />creeks. <br /> <br />URS <br /> <br />T:\PROJ ECTS\6844888 _ CWCB _FLOOD_DOC _RPTS\SUB _00\6.0 _PROJ_DELlV\REPORT\FI NAL REPORT .2. D0020-MAR-021 \ 3 - 3 <br />