2007-11-23_HYDROLOGY - M1977300 ‎(2)‎

• Permit No: M1977300
• IBM Index Class Name: HYDROLOGY
• Doc Date: 11/23/2007
• Doc Name: Hydro Eval, Vol. II- Ap. A- Ralston Creek Flow Data
• From: Cotter and Whetstone
• To: DRMS
• Permit Index Doc Type: Hydrology Report
• Email Name: DB2
• Media Type: D
• Archive: No

•
•
RATING CURVE AND FLOW DATA FOR
STATION SW-OS
1. Rating Curve Calculation (Stage vs Flow Rate)
Location Date Stage (ft) Flow (cfs) slope (m) intercept (b)
SW-OS Base 0 0.00 6.38 0
SW-OS 7/19/1999 0.99 6.32 -65.00 70.67
SW-OS 10/20/1998 1.06 1.77 147.00 -154.05
SW-OS 8/2/1999 1.18 19.41 26.63 -12.02
SW-OS 5/19/1999 1.75 34.59 26.63 -12.02
II. Stage Readings and Computed Flow Rates
Date Location Stage (ft) Flow (cfs)
10/20/1998 SW-OS 1.02 4.37
11/24/1998 SW-OS 0.98 6.26
12/16/1998 SW-OS 1.02 4.37
1/18/1999 SW-OS 1.25 21.27
2/16/1999 SW-OS 0.9 5.75
4/20/1999 SW-OS 1.25 21.27
5/17/1999 SW-OS 1.75 34.59
5/18/1999 SW-OS 1.9 38.58
7/19/1999 SW-OS 0.99 6.32
8/2/1999 SW-OS 1.18 19.41
9/14/1999 SW-OS 1.5 27.93
Rating Curve for SW-OS
40
35
------------- ------------
30 '
d
------------------------- = --
20 ------------
-------
R
3 '
V 25 ----------- ------------------
------------ - ------------ -- --------
o ----------
- ------------
10
---------- --------- ------------ ------------
u.
5
------------ - -
--- ----- -------- -- --------
0
0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00
Stage (feet)
Calculated Stream Flow for Station SW-OS
45
35
v? 30
LL
v
20 ------------------------------------------------ -- ----- - --------------- -
3
0
- 15
--------------------- -- ------ -------------------
10
5
0
Jul-98 Oct-98 Jan-99 Apr-99 Jul-99 Oct-99 Jan-00
Station OS