139 - 



14. Rough grade a new road only as far as that road can be completely 

 finished during the current construction season. Construct water- 

 bars on decking roads to prevent erosion. 



15. Keep slope stabilization work as current as possible with road 

 construction. 



16. When installing culverts, avoid channel changes and place culverts 

 so they conform to the natural stream channel as closely as 

 possible. Design culverts for maximum streamflows; overdesign 

 rather than underdesign when peak flows are not known. Remove 



as much debris from the channel above the culvert as possible. 

 Carefully compact the fill material around all culverts to 

 prevent seepage and ultimate culvert failure. 



17. Keep stream disturbance to an absolute minimum; prevent any 

 disturbance during high flow periods. 



18. Vagaries in weather conditions are an important factor leading 

 to erosion during construction. In areas where the climate 

 permits, plan jobs for completion during dry periods. Elsewhere, 

 limit the work area to small sections that can be completed 

 before proceeding further. This exposes a minimum of disturbed 

 area to erosion forces in the event the weather changes. Light 

 rains usually have limited erosional impacts. However, if obvious 

 impacts occur during larger storms, be prepared to cease operations 

 after installing emergency drainage as needed. It is advisable 



to install all designed drainage from the downstream end of 

 the job to the upstream end in areas of unpredictable weather. 



