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<br />Results of Modeliaa: <br />Colowvo's Modelinc of Prospect Pond - 4-16-92 <br />Model based upon a simple composite curve number of 63 used <br />throughout the demonstration. (Members of the hydrology staff who <br />reviewed Juan Garcia's "Curve Number Justification" failed to agree <br />with many of the justifications given) Worse case was based on the <br />assumption that a pit or pits would be in place to detain much of <br />the runoff from reaching the South Collection Ditch or Prospect <br />Pond. Times of concentration were improperly determined resulting <br />in reduced velocities. <br />Results for a 1o year, 24 hour event: <br />4.5 acre feet total volume reaching the Prospect Pond <br />.2 cfs peak discharge <br />Division's Modelinc of Prospect Pond - 4-28-92 <br />Model based upon curve numbers of 87 and 49 for unvegetated and <br />undisturbed lands, respectively. Worse case was based on the <br />assumption that the Section 16 pit would be closed and undergoing <br />reclamation. <br />Results for a 10 year, 24 hour event: <br />22 acre feet total volume reaching the Prospect Pond <br />174 cfs peak discharge <br />Colowvo's Modelinc of Prospect Pond - 12-14-92 <br />Model based upon a more precise delineation !or curve numbers, <br />however, the curve numbers used did not agree the with curve <br />numbers agreed upon in a meeting with the Diviaioa (eq. newly <br />topsoiled and planted areas were given a curve number of 49). <br />worse case vas based upon the assumption that the Section 16 pit <br />would be in place to keep much of the runoff from reaching the <br />South Collection Ditch or Prospect Pond. Times of concentration <br />were properly calculated. _, <br />Results for a 10 year, 24 hour event: <br />.2 acre feet total volume reaching the Prospect Pond <br />1 cfs peak discharge <br />Channel velocities of 6 - 12 fps <br />