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CITY OF EVERETT STORMWATER MANAGEMENT MANUAL <br /> � 5. Stone for riprap shall consist of 6eld stone or quarry stonc af approximately rectangular shap:. <br /> The stonc shell be hard and angular and of such qualiry that it will not disintegrate on exposure to <br /> water or wcathcring and it shall be suitablc in all respects for the purpose intended. <br /> 6. Rubble ceccrete may be used provided it has a density of at least I50 pounds per cubic foot,and <br /> ot6envise meets the requiremcnt of this stan�ard and specificadon. <br /> 7. A lining oC engineering filter fabric(geotextile)s6a11 be placed betwcen the riprap and the <br /> undedying soil sudace to provent soil movement into or ttuough the riprap. The geotextile <br /> shoufd be keyed in at the top of the bank. <br /> 8. Filter fabric shail not be used on slopes greatcr than 1.5:I as slippage may occur. lt should be <br /> used in conjunction with a layer of coarse aggregate (granular filter blanket)when the riprap to bc <br /> placed is 12 inches and larger. <br /> 3.3.4 BMP C203: Water Bars <br /> Purpose <br /> A small ditch or ridge of material is conskucted diagonally across a raad or right•of-way to divert <br /> srocmwater run�ff from thc road surCace,wheel tracks,or a shallow road ditch. <br /> Conditions of Use <br /> Clearing right-of-way and construction af access for power lines,pipelines,and other similaz installations <br /> often require long nartow right-of-ways over sloping tecrain. Disturbance and compaction promotes guily <br /> fortnation in these cleared strips by increasing the volume and velocity of runofE Gully fortnation may be <br /> ' especially severe in tire hacks and ruts. To prevent gullying,runofTcan often be diverted across the <br /> � widU:of the right-of-way to undishubed areas by using small predesigned diversions. <br /> Special consideration shall 6c given to cach individual outlet area, a;well as to the cumulative effect of <br /> added diversions. Use gravel to stabilize the diversion where significant vchiculaz haf6c is an[icipated. <br /> DesJgn and lnstallation SpeciBcallons <br /> 1. Height: 8-inch minimum measured from the channel bottom to the ridge top. <br /> 2. Side slope of channcl: 2:1 maximum;3:1 or ftatter when vehides w�(l cross. <br /> 3. Basc width of ridge: 6-inch minimum. <br /> 4. Locate them to use netural drainage systems and to discharge into well vegctated stable areas. <br /> 5. Grade of water bar and angle: Select engle that results in ditch slope less than 2 percent. <br /> 6. Install as soon as the clearing and grading is complete. Reconstruct when construction is <br /> complete on a section when utilities are being installed. <br /> 7. Compact the ridge when installed.Stabilize,seed and mulch the ponions Ihat are not subject ro <br /> traffic. Gravcl the arcas crossed by vehicles. <br /> Volume II—Consfruction Sformwater Pollution Prevenlion <br /> 3-40 <br />