PERMFILE123068

• Permit No: C1982056
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: EXHIBIT 08 TAB 4.9 East Rockfall Hazard Trench, 10yr 24hr SAE
• Media Type: D
• Archive: No

Manning's
Heigqht Slope 2 n Porosity
--------------
---------- ---------------
-------
-- ------------
--------

•~ ----
3.5 4.40
Ef
T ----
--
1.5:1 0.032
fi
i
' 7 ---
41.00
55 ~
rap c
ency:
.
Runoff Peak Peak Sediment. Peak Settleable
Volume Discharge Sediment Concentration Concentration 24VW 24AA
(ac-ft) (cfs) (tons} (mg/1) - ml/1 (ml/1) (ml/1)
IN 0.25
~--2.12 0.6
5083
2.96
1.47
0.23
OUT 0.25 2.12 0.6 4700 2.64 1.31 0.21

J4, B1, S1
GRASS FILTER
Drainage Area from J4, B1, S1, SWS(s)1:
Total Contributing Drainage Area:
GRASS
Seg
0.20 inches
Stiffness
Factor
(N-sq m)
0.0 acres
18.7 acres
------ Filter ------
Len th Width Slo e
(f~) (ft) ($~
1 0.0120 9.0 1.0 0.05 20.000 175.0 75.0 26.0
Total Filter Peak Critical Filter S ediment
Trap Infiltration Infiltrat ion Flow Prone Travel Wed a
it
l
i
~i Depth
Efficiency Volume Rate Depth Ve
y T
oc
me Loca
on i n Zone
• .
(~)------ -(ac_ft)--- __---(cfs) _--(inch)_ --(fps)--- (hrs) (feet)
==s_____________ (inch)
______'
)
58.5 0.0161 0.015 2 0.129 1.0367 0.1000 0.000 0.20£
Runoff Peak Peak Sediment Peak Settleable
Volume Discharge Sediment Concentration Concentration 24VW 24AA
(ac-f t) (cfs) (tons) (mg/1) ml/1 (ml/1) (ml/1)
IN 0.25 2.12 0.6 4700 2.64 1.31 0.21
OUT 0.24 2.11 0.2 2312 0.50 0.23 0.03
~******************************,t****t~******~**************,t*****************

TAB 4.9, PG 11
FILTER INPUTS:
Bulk Specific Gr
Initial Depth of
Manning's Grass
n Height
(in)
3vity: 1.18
Sediment in Zone D:
Grass Infiltration
Spacing Rate
(in) (iph)
EX 8-134
Permit Rene~~al No. 3 FORMERLY I I/I/99