Laserfiche WebLink
<br /> <br />definite danger of Injury or drowning. Sewage, garbage and other <br />organic materials carried or deposited by floodwater could create <br />hazards to health. <br /> <br />FLOODED AREAS AND FLOOD DA~GES <br /> <br />The areas along the streams in the study area that would be inun- <br />dated by a Standard Project Flood are shown on Plate 4, which is also <br />an index to Plates 5-9. Areas that would be flooded by the Intermediate <br />Regional and Standard Project Floods are shown in detail on Plates 5-9. <br />As may be seen from these plates, flooding along the Colorado and <br />Gunnison Rivers would be confined to the Immediately adjacent over- <br />bank areas. Colorado River floodflows wll I inundate bottom lands along <br />the north side of the river and low sandbar islands immediately upstream <br />from Grand Junction. The commercially developed area near the Fifth <br />Street bridges and the residential area near Riverside Park would be <br />threatened by the high flows of the Colorado River. These flows can <br />back into the Connecticut Lakes area to the south of the river. The <br />higher flows on the Gunnison River would flood agricultural areas up- <br />stream from the mouth. No Thoroughfare and Red Canyons have no develop- <br />able flood plains unti I they reach the flood plain of the Colorado River. <br />Areas subject to flooding from these creeks are also flooded by flows <br />from the Colorado River. <br /> <br />Flood damage would consist of deposition of silt and floatable <br /> <br /> <br />debris, bank erosion, and erosion of channel islands. Agricultural <br /> <br /> <br />crops would be damaged by si It deposition and drowning of crops. Floodflows <br /> <br /> <br />would cause damage to bui Idings, erode stream banks, and undermine streets <br /> <br />and lots. <br /> <br /> <br />A Standard Project Flood could cause more extensive damage than an <br /> <br /> <br />Intermediate Regional Flood due to the wider flood plain, greater depth <br /> <br /> <br />of flooding, higher velocity of flow and longer duration of flooding. <br /> <br /> <br />Plates 10-18 show water surface profi les of the Intermediate Regional and <br /> <br />Standard Project Floods. Depth of flow in the channel can be estimated <br /> <br /> <br />from these illustrations. Typical cross sections of the flood plain at <br /> <br /> <br />selected locations, together with the water surface elevations and the <br /> <br />18 <br />