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<br />; ~ <br /> <br />AREA 2 PUEBLO FIS <br /> <br />Since the drainage ar"a was less than one square mile, the approximate <br /> <br /> <br />study method was used. The street system will not carry the 100-year <br /> <br /> <br />flow. <br /> <br />Flows were computed ~)r four concentration points at: <br /> <br /> <br />1. Portland Ayenue underpass <br /> <br /> <br />2. 1st Street <br /> <br /> <br />3. 4th Street <br /> <br /> <br />4. 13th Street <br /> <br />Flows were computed bJ" using the formula from the "Report on Hydrologic <br /> <br /> <br />Investigations, Flood Insurance Study, Pueblo, Cola" on page 6: <br /> <br />~OO = 1770 A 0.432 <br /> <br />S 0.154 <br />B <br /> <br />\ <br /> <br />At cross sections 2080, 2050, 2040, 2030, and 2020 critical depth ratings <br />were made for the channel consisting of a street, sidewalks, and adjoining <br />yards. The remaining portion of each section was rated at normal depth <br />using a high "n" value for blockage caused by houses, fences, etc. <br /> <br />Cross sections 2060 and 2070 show that the streets are not significantly <br />deep channels. <br /> <br />Ponding occurs above the AT&S RR. The entire flow from Area 2 drains <br />through Portland Avenu~ under the AT&S HR. <br /> <br />The upper ends of the flood plains are open. To go further up in the <br />watershed would reduce the flows making the flood.plain width less than <br />the 200' minimum plotting guideline, <br /> <br />i.. <br />, <br /> <br />:'~ <br /> <br />I <br /> <br />"' <br />