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Culvert Selection Chart for Rural Private and Field Entrances <br /> thr PLAN VIEW <br /> Road Centerline <br /> Edge of Pavement <br /> Edge of Shoulder <br /> Ditch Line <br /> = L <br /> 25' Radius <br /> =W <br /> Note: Concrete or decorative driveway pavements are not allowed within 20'of edge of highway pavement. <br /> Asphalt driveways may be paved up to the edge of highway pavement. <br /> CROSS-SECTION VIEW <br /> Edge of R/W <br /> Road Centerline Drainage <br /> 2-6% <br /> Profile between+/-6% <br /> --- to edge of R/W <br /> 0 <br /> Edge of Shoulder 10' norm., 8' min <br /> < 20 <br /> Driveway graded to drain away from edge of shoulder a minimum of 8'. <br /> W=Proposed driveway width <br /> H=Height of Fill 16 I 18 I 20 I 22 I 24 ( 26 ( 28 I 30 <br /> Above Culvert L=Length of Culvert Required <br /> 0.5 26 28 28 30 32 34 36 38 <br /> 1.0 26 28 30 32 34 36 38 40 <br /> 1.5 28 30 32 34 36 38 40 42 <br /> 2.0 30 32 34 36 38 40 42 44 <br /> 2.5 34 36 38 40 42 44 46 48 <br /> 3.0 36 38 40 42 44 46 48 50 <br /> 3.5 38 40 42 44 46 48 50 52 <br /> 4.0 40 42 44 46 48 50 52 54 <br /> 4.5 44 46 46 50 52 54 56 58 <br /> Cr 5.0 46 48 50 52 54 56 58 60 <br /> Culvert diameter to be determined by Dane County and approved apron endwalls are required. <br />