Erosion and Sediment Pollution Control Program Manual.pdf

Pumped water bypass systems should conform to Figure 3.11. Pump-around systems should not be
used for bypasses anticipated to last more than 2 weeks. NOTE: A cofferdam should be
constructed to impound water for the pump intake. DO NOT EXCAVATE A SUMP AREA WITHIN
THE STREAM CHANNEL FOR THE PUMP INTAKE.
Whenever an in-stream cofferdam diversion is used, it should conform to Figure 3.12. Various types of
cofferdams are available from various manufacturers. Wherever such cofferdams are proposed, they
should conform to the manufacturer’s specifications. Any calculations needed to show compliance with
these specs should be included in the narrative. All installation, maintenance, and removal details
should be shown on the plan drawings.
Sand bag diversion dams should conform to Standard Construction Detail #3-15.
PA DEP
FIGURE 3.9
Bypass Channel with Non-Erosive Lining
* Sandbags (Standard Construction Detail #3-15), Jersey barriers (Figure 3.13) or other nonerosive
material, no earth fill.
** See Standard Construction Detail # 4-14. For low gradient channels, the rock filter may be
replaced by an impervious cofferdam to prevent backflow into the work area.
363-2134-008 / March 31, 2012 / Page 44