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I I w ~ ~ . % U .. ,,%- ~~~ ~..~ ~W_ "" C .. .. w > " .. z zz z c .. ~ ~.. WW a.>.. " JO ~~ WN "-J - .. ~" z ~w~ ....~ 10:0' >J~ Z~~ - ~ H z ~ - ::> ..~ '" ..~ W ~ Z J H ,.., z '" Q zc_ - -~ 0 " ,,~ :<: ,. i " en I I would occur when the volume of inflow from storm runoff exceeded the available storage in the canal above the irrigation base flow and that once the canal bank was overtopped, the outflow would equal the inflow." I There is approximately 5000 LF of canal through the basin which would result in around 25 to 30 acre-feet of flood storage volume. The estimated 2-year runoff volume is 18 to 20 acre-feet (excess precipitation" 0.40 in., area.. 543 acres). Therefore, the canal apparently has the capacity to contain the 2-year runoff, provided that the overflow occurs at the locations anticipated in the report, I I I 2. The entire flood peaks for higher intensity storms will pass directly through the canal since the canal will not have adequate flood storage to impact the 5-year or greater floods. I I 3. The primary Denver Highline Canal spill, within the Slaughterhouse Gulch basin will occur at Clarkson Street and therefore the downstream routing of flood peaks will reflect this condition, Based upon mapping for Broad- way Estates subdivision and field investigations, this assumption was confirmed. The assumption was also confirmed by the additional project mapping requested by Water Resources Consultants, Inc. (WRC). Other potential spill locations within the basin identified in line Canal report are at Caley Avenue and 10OQ-feet west I I a . 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This information is presented on Figures 111-5 and 111-6 as a peak flow diagrams for existing drainage facilities and proposed drainage facilities. As can be seen from the figures, the proposed Caley detention dam reduces the discharge from Powers Park detention for the 5-year and greater frequency floods. I I I ~z w ~"".... o . . "",,<0 C ~ ~ . ~ . o:::_=t'. o . . >~~ , - J ~ ~ ~ z o ~- '-l..... -u -w ~~ ,~ ~ u "'l ,",'''' !:... C' ., 3'~Il';:r C'.... -6'~ _...I:r' _ _....__,..."'.."" ....;"N "'1 .. . ~ ~ g . '" " - a '" " TABLE m-1 w ~" oz ~ ----------... - ~ '" . ~ ~ z '" ~ ~ . . z u U c 0 u 0 c w " .. ~ 0 ~ ~ c . 0 . ~ W " - L E " . z ~ J J C . ~ ~ " " ~ UPPER SLAUGHTERHOUSE GULCH MAJOR DRAINAGE WAY PLANNING WATER RESOURCES CONSULTANTS INC. MARCH, 1983 -14- _w s~ooocooooooooc>oO ~40~~OCC~~~~~~m~C 'so__o___________ z uOO~OCOODOgOgUO _~OOOooooOOOCOOOO _4. . .. . . . . . . . . . . . lo.IU_ _ ~w 00 .. 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