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Last modified
1/25/2010 6:24:53 PM
Creation date
10/4/2006 11:00:07 PM
Metadata
Fields
Template:
Floodplain Documents
County
El Paso
Community
Colorado Springs, El Paso County
Stream Name
Monument Creek
Basin
Arkansas
Title
Baseline Hydrology Monument Creek
Date
11/1/1991
Prepared For
Colorado Springs
Prepared By
Kiowa Engineering Corporation
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br /> Table4 Existing Land Use Categories <br /> Range of Average <br />Typ< Typical Land Use Imperviousness Imperviousness <br />1 AgriculturalJForest/OpenSpace o to 4% 2% <br />2 Residential (0.1 to 0.4 DUlac)/Park 5to14% 9% <br />3 Residential (0.4 to 4 DU/ac) 15t039% 27% <br />4 Residential (4to8 DU/ac)/ I <br /> , <br />Multifamily/Neighborhood Business Areas 4()t069% 54% I <br /> , <br />5 Commercial/lndustrial 70 to 99% 84% i <br />I <br /> <br />over-allocated in any wne, provide the information necessary to clllculate imperviousness <br />perccntagesforeachcransportation wneforthe ultimate build-out oondition. <br />Several different growth distribution scenarios were analyzed in the plan in order to <br />forecast urban eKpansion over the neKt severalde<::ades (a shoner time frame than it would tak:e <br />to achieve an ultimate build-out condition). The scenarios included a most likely condition, a set <br />o:directicn.al scen:!..'"i.cs (northem growth. eaSlern !;fIJwth, anusoulherngrowth)llJ'Idabuild-ollt <br />condition of existing zoning and approved plans. The continuation of current growth trends and <br />the directional growth scenarios wen: forecasted to a planning horizon defined as the time frame <br />at which the population in the study area reaches one million. This planning horizon, whk:h, <br />according to the plan, is expected to represent the year 2030 or beyond. was assumed to be <br />appropriate for the purpose of estimating quantities of stormwater runoff for future developmem <br />conditions in the Monument Creek watershed. <br />Estimates of imperviousness for the ultimate build-out condition 01' the cransportallcn <br />zones were adjusted so that they would be represcntative of the one milUon population planning <br />horiwn. The adjustment was comprised of multiplying the area of residential and business <br />development projccted for ultimare build-out by the ratio of forecasted po pulation (forlhe one <br />million planning horizon) to the ultimate population. Tr.msponation planning rones we~ <br />superimposed on a drainage basin map and measured using a planimeter to estimate a weighted <br />average percent imperviousness fur each sub-basin for futuredevelopmen tconditions. <br /> <br />1ll-9 <br /> <br />After soils types and pereent imperviousness for existing and future development <br />conditions were identified, runoff curve numbers were calculated. A weighted average curve <br />number was calculated for each sub-basin for both e~isting and future development conditions. <br />The results of these calculations are presented in Section IV of this repon. <br /> <br />m.JO <br />
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