Laserfiche WebLink
Using the emergency spillway as a reference the principle spillway would have <br />to be at least 4.7 feet above the sediment level to contain a 10 year 24 hour <br />storm event. Additional pond capacity can be achieved by raising the <br />principle spillway to within 1 foot of the emergency spillway. <br />Recommendations and conclusions: The pond as designed has sufficient capacity <br />to contain twice the 10 year 24 hour storm event. The riser pipe for the <br />principle spillway should be installed as specified in the original approved <br />design. The pipe should be marked with foot gradations below the top of the <br />outlet. At no time should .the sediment level be allowed to be above 5 feet <br />below the outlet pipe; this level should be marked with red paint or other <br />means to indicate tom] the sediment cleanout level. The riser pipe <br />should be stabilized in a vertical position with fence posts to prevent ice <br />and cattle from knocking the pipe over. The dewatering device can be a dozen, <br />one half inch holes drilled along the length of the pipe from the top of the <br />pipe to the sediment clean out marker. <br />RPP/ddt <br />7908E <br />