Laserfiche WebLink
' 6.2 Erosion Control Improvements - School Section Pit <br /> Chen recommended the construction of the rock check dams to control <br /> erosion on the steeper concentrated flow areas. This report examined in <br /> depth methods to take advantage of existing detention structures, local <br /> topographic features and potential basin diversions. With smaller flood <br /> ' flows than developed by the Chen report and this Design Report's reliance <br /> on diverting flood flows to detention stuctures, the rock check dams <br /> ' recommended by Chen are no longer required. Since the Chen report, some <br /> of the questionable areas have vegetated and stabilized. <br /> One observation over the past three years is the vegetation has not <br /> had time to completely become established due to cattle grazing. The <br /> vegetation emerges in the early spring and is immediately consumed by <br /> ' cattle before the full growth cycle is achieved. One recommendation is to <br /> fence areas with the highest erosion potential that are subjected to the <br /> most overgrazing. On May 15, 1991 the State Land Board authorized the <br /> construction of a fence around the School Section Pit and construction is <br /> underway. <br /> MLRD has expressed concern over any of the rills with depths over six <br /> to twelve inches. Unfortunately, a complete reshaping of the slopes will <br /> ' destroy the topsoil and vegetation that is finally becoming established. <br /> Following is a description of the drainage basins that affect the pit <br /> and the Umetco's proposed corrective action recommendations. Figure 6.2 <br /> shows some of the pertinent features. Figure 6.4 summarizes the channel <br /> characteristics. <br /> -13- <br />