1987-12-01_PERMIT FILE - C1981017 ‎(94)‎

• Permit No: C1981017
• IBM Index Class Name: PERMIT FILE
• Doc Date: 12/1/1987
• Doc Name: Coal Refuse Facility Driainage Control Plan
• Section_Exhibit Name: Chapter II Attachment 5 to Appendix II-B-7 ‎(11-B-App. 7 Att.5)‎
• Media Type: D
• Archive: No

RIPRAP SIZING CHART
RIPRAP DESIGNATION AND d50 SIZE
i i 1
20 I i
1 I I
W - - - �- - -- ---
i _
uu- 15
1
,•' � � 1 1 I 1 1
H(18'
p
W 10
>
g,3 1 1 1
' L( S`
1
! ! I VL(V)
5 � �
. 0
0 .05 .10 .15 .20 .25
CHANNEL SLOPE S
SIZING DERIVED FROM FORMULA:
VS 0.17 (VS o.17 2
= 5.8 OR d 50 —
d50(SS —1) 0.66 7.58
ASSUMING SPECIFIC GRAVITY OF RIPRAP. SS = 2.5
REF: URBAN STORM DRAINAGE CRITERIA MANUAL. MAJOR DRAINAGE SECTION .
4 GEO-HYDRO CONSULTING. INC.