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<br />Fort1fica~1on Or8r~(;epOrt
<br />
<br />EstImated flood f:t"eQ.l1enole~~ Fortlfloat!on Creek at H!ghw8Y U S lW at CralR. Colo.
<br />
<br />Number of times that
<br />flood ,"OlUe. be equaled or
<br />exceedod in 100 yoara
<br />
<br />N~ber of timea that
<br />3: flood would be equaled or
<br />.,
<br />excoeded in 100 yearB
<br />
<br />Peak
<br />dlocharge
<br />
<br />Peak
<br />dlo charge
<br />
<br />1............. ........ .....:
<br />6...~ 0 0 O' 0 0 0..0....... .....J
<br />
<br />Cubic flQet ::
<br />j2e~n~ :l
<br />*2,600 ~ t
<br />1.350 II
<br />
<br />20g... 0 I. 000 ........0.. '0.:
<br />44..... ..... ......... .....1
<br />
<br />Cubio feet
<br />~~~
<br />900
<br />..700
<br />
<br />· Standard projeot flood.
<br />
<br />.. Minimum damaging flood.
<br />
<br />32. Standard llro.1oct fJ.ood,--A etandal'd projeo~ flood = be readily
<br />
<br />defined as a large hypothetical flocd that would be exceeded only on rare
<br />
<br />occasions. It could occur in the Fortification Creek Basin if a etQrm
<br />
<br />equivalent in magnitude to the largest general storm of r~cord in the
<br />
<br />region were to center 07e:' the basin when ground and cl~atic oonditions
<br />
<br />.;,
<br />
<br />were oonducive to a high rate ot ron-off. Eet1mates of the magnitude of
<br />
<br />'.,
<br />
<br />suoh a flood serve not only as a reaconable yardstick for detsmining .~he
<br />
<br />flood-producing potentialities of the basin but oleo as a reasonable upper
<br />
<br />limit in determining the size of flood that should be consid~red in
<br />
<br />designing flood-control impravements. EBtlmat~s of magnitude of the
<br />
<br />standard project flood were ba.aed on a sno~mel t flood that would occur
<br />
<br />under the most crt tical se.luence of temperatures of record at the time of
<br />
<br />a heavy snow cover and that would be augmented by run-off resulting from
<br />
<br />a storm equivalent in magnitude to the mazimum spring rainstorm of record.
<br />
<br />The peak discharge of the atandard projeot flood for Fortifioation Creek
<br />
<br />
<br />10 eetimated at 2.600 cubio feet per eecond at Highwsy U S l!o at Craig.
<br />
<br />Detailed information on the determination of the standard projeot flood
<br />
<br />ie given in Appendix 1. lI;ydrology.
<br />
<br />EXTENT AlIID CIIAlWlTER OF FLOODED AREA
<br />
<br />33. Location and extent.__The prinoipal overflow areaa in the Forti-
<br />fication Creel< Baein include (1) atripa of bottom laM along both aidea cf
<br />the stream end (2) the flat alluvial cone lIpon whioh the town of Craig 10
<br />looated, at tha lcwer end of Fort1f ioe.tion Creel<. The tota;L botto....land
<br />
<br />13
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