Laserfiche WebLink
<br />. <br /> <br />(see Glosary). In Colorado serious flooding has <br />resulted from: <br /> <br />. <br /> <br />A general rainstorm - May thru October <br />An intense thunderstorm - June thru October <br />A rapid snowmelt - April thru June <br />Rainfall on snowmelt - May thru June <br />Ice jams causing damming - February thru April <br />Dam failures - January thru December. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />The lOa-year flood standard has been accepted and <br />adopted as the basis for land-use planning and regu- <br />latory activities in Colorado. A lOa-year flood <br />would be expected to happen once every 100 years or <br />it has a one percent chance of occurring during any <br />given year. A higher degree of protection is recom- <br />mended for human-dependent facilities such as water <br />supply and sewage treatment plants or hospitals. A <br />SOO-year design is recommended for these facilities. <br /> <br />-20- <br /> <br /> <br />The C~CB recommends the following guide in selecting <br />the appropriate method(s) for a hydrologic investi- <br />gation in a particuJar community. <br /> <br />. <br /> <br />For developing urban areas, the hydrologist should <br /> <br /> <br />select a synthetic rainfall runoff method and corre- <br /> <br /> <br />late it to available gage records. Acceptable <br /> <br /> <br />models are: <br />