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C. Material Specifications C. Ditch checks installed in grass lined <br /> channels may kill the vegetation if water is <br /> L Stone ditch checks shall be constructed funded for extended periods or excessive <br /> rife well-graded angular stone, a Usaof siltation occurs. Proper maintenance is <br /> 3 inch or greater,sometimes referred to required to keep areas above and below the <br /> as breaker nm in shot rock, ditch check stabilized. <br /> 2. Ditch checks may be contracted of D. The best way to prevent sediment from <br /> other approved materials but most be entering the stone sewer system is to <br /> capable ofwithstanding the flow stabilize the disturbed area fthe site as <br /> velocities in the channel. Manufactured quickly as possible,preventing erosion and <br /> products listed in WisDOT's PAL are stopping sediment transport at its source. <br /> also acceptable for temporary ditch E. When placing ditch checks in swales <br /> checks. adjacent to roadways consider designating a <br /> 'clear zone' free of obstacles posing a threat <br /> Note: Silt fence and single rows of to out of control vehicles. <br /> straw bales are ineffective as ditch <br /> checks and are not permitted. F. Mowing operations may throw stones from <br /> ditch checks causing a potential safety <br /> 1). Construction - Refer to Figure 1 &2 hazard. <br /> I. Ditch checks shall be utilized during VII. Plans and Specifications <br /> rough grading and shall be removed <br /> once the final grading and channel A. Plats and specifications for installing ditch <br /> stabilization is applied,unless intended checks shall be in keeping with this standard <br /> to be part of a per stortrwater and shall describe the requirements for <br /> management plan. applying the practice to achieve its intended <br /> purpose.The plans and specifications shall <br /> 2. Channel erosion mat or other non- address the following: <br /> erodible materials shall be placed at the <br /> base of a ditch check,and extended a I. Location and spacing of ditch check <br /> minimum of 6 feel,to prevent scour and <br /> washing out the toe of the ditch check. 2. Schedules and sequence of installation <br /> DNR Conservation I'mctice Channel and removal <br /> Erosion Mat(1053)contains criteria for 3. Standard drawings and installation <br /> the placement of erosion mat in this details <br /> location. <br /> 3. Chink or scut stone and rock ditch 4. Rock gradation <br /> checks to minimize the flow through the g All plans,standard detail drawings,or <br /> ditch check. specifications shall include schedule for <br /> installation, inspection,and maintenance. <br /> VI. Considerations The responsible patty shall be identified. <br /> A. For added stability, the base ofa stone or VIII.Operation and Maintenance <br /> rock ditch check should be keyed into the <br /> soil to a depth of 6-inches. A. Ditch checks shall,at a minimum,be <br /> inspected weekly and within 24 hours after <br /> 13. Stone ditch checks maybe underlain by a every precipitation event that produces 0.5 <br /> nonwoven geotextile fabric to case <br /> installation and removal. inches of rain or more during a 24 hour <br /> geotextile period. <br /> fabric is extended, it can serveerve purpose <br /> specified in section V.D.2 B. Unless incorporated into a pemwnent <br /> stonnwater management system,ditch <br /> WDNR 2 <br /> 03/06 <br />