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Last modified
1/25/2010 6:25:31 PM
Creation date
10/4/2006 11:11:57 PM
Metadata
Fields
Template:
Floodplain Documents
County
Weld
Community
Windsor, Laku Landing
Stream Name
Cache La Poudre River
Basin
South Platte
Title
HEC-2 Study of Laku Landing
Date
2/4/1992
Prepared For
Laku Landing
Prepared By
CWCB
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />. <br /> <br />. <br /> <br />. <br /> <br />Hydraulic Analysis of Proposed Conditions <br /> <br />7 <br /> <br />Table 1 shows there is some drop in water surface when the lakes are present, due to the decreased <br />roughness of the water surface in comparison to the ground which was present at the time of the <br />current FIS study. A plot of cross section # 139690 is shown in figure 5. <br /> <br /> .~] <br /> 4785 <br /> I <br /> 47'" <br />~ 47" <br />.I <br />. <br /> ,no <br /> '765 <br /> .760 <br /> 1.00 <br /> <br />LUuL.lndiJla; <br />Propo-l~ (..ooified roustm-l <br />c....--:tioa.1396!lO.(IX) <br />O.lm <br /> <br /> <br /> <br />"'.... <br /> <br />1179.50 <br /> <br />""'" <br />"""- <br /> <br />""-'l <br /> <br />4715.00 <br /> <br />Figure 5. Laku Landing Proposed Conditions Due to Modified Roughness of Floodway <br /> <br />Changes Due To Reduced Roughness and Spectator Area <br /> <br />In an effort to return flood water profiles to their original level before the construction of two lakes <br />near cross section #139690, a raised spectator area can be created approximately in the middle of <br />the longitudinal axis of the lakes. The addition of this spectator area will only slightly increase <br />flow velocities while raising the water level during a base flood discharge back to the original level <br />present at the time of the eurrent FIS. For more information on the details of this spectator area, <br />see 'Spectator Area Design Specifications', page 7. Table 2 summarizes the results of adding this <br />spectator area. <br /> <br /> <br />A plot of cross section # 139690 is shown in figure 6, with a ten foot high spectator area located <br />approximately in the middle of the longitudinal axis between the lakes. <br /> <br />Spectator Area Design Specifications <br /> <br />The raised spectator area will be built with a mixture of sand, gravel and topsoil and seeded with <br />mechanical drilling methods. All design specifications ofthis spectator area are chosen for minimum <br />erosion in the event of a base flood discharge. The design of the spectator area is illustrated in <br />figure 7. <br />
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