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headwall. Downstream of this headwall an earthen or rock berm will be constructed <br />west/east along a singular contour elevation to dissipate the concentrated flow before it <br />reaches the back of the adjacent drainageway to the south. See Figure 3. <br />TEMPORARY EROSION CONTROL. To the extent feasible storm -water runoff during <br />construction will be directed via berms and/or piping into the detention chamber which <br />will act as a temporary sediment trap during construction. Detention pond outlets will be <br />temporarily blocked to prevent release of storm - water. An alternative or additional storm - <br />water control will consist of either an earthen or rock berm located downstream of the <br />building along the south property line near the southeast property corner to act as a <br />sediment trap (see Figure 4). Release of trapped water from either type of sediment trap <br />will be either by a perforated riser pipe or by pumping. <br />alone/ heeler, Inc. <br />Engineering & Development Consultants <br />7500 Rialto Blvd, Bldg 1, Suite 240 <br />Austin, Texas 78735 <br />Phone: (512) 899-0601 Fax: (512) 899 -0655 <br />Firm Registration No. F -786 <br />