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Questions/Comments from DWQ on R-2518A Stream Mitigation
Provide existing conditions morphological table information or cross-sections.
'vii morplx}logical table can exiting conditions ivas prepared. l lc7tivever attached is irrforn-t~ation used. to
classify the existin`_>>, clranncis. Site E3 is riot included since it is piped. In the notes Site 1 is Site A. Site ? is
Site C . Sttc; is Site D; Site 4a & 41? is Site E. Site 4c i Site 1°, Site 8 is Site 1. Site 9 is Site J, Site 1 1 rs Site
ti~l and Site t2 is Sitc'_v.
Was the regional curve data a combination of SRI and HSMM data?
Y"es 3 points were [corn the SRI dater and 3 points t~~ere from iata collected. L-ry HS~~1M. (See pages 7 &-, 8 oI'
mitigation plan}
How were the meander length and meander width ratios obtained, since there were none listed for the
reference?
Meander L.en~tlt Ratios and Meander ti~~'tdth :Ratios v~-ere determined based o~~ past projects and information
obtained irr reference material.
Is the Sinuosity on Site C and E correct? Concerned over the higher sinuosity compared to the reference.
Site t; Sinuosity is incorrect. The sinuosit~~ of `site C should lie 1.04.
'17~e Sincra>sity of `~itc I?: is correct. Althcxz~h it is higher than fhL reference, we feel conticfetZt in the design
and believe the channel. «il1 be stable.
Would like to have locations of reference streams. (Provide Roadway Station numbers since they are on-
site)
Reference Site 1 is ~vitltin Site K, a prescrvatu>n site. 'lot sure o'}'the coact station number.
Reference Site 2 is just past Site r~ arcxnxl Station 21-' {i0. It is behind the business on the right lrarxl side.
Reference Site 3 is yarithin Site L around Station ?0-!-50
Sites 1 & 2 were used for the design, while Site ~ was used solelti- to create the localized regional carve.
It a visit to the reference sites is needed, please let us knotiv.
Why is only the D50 and D841isted for Site N2?
'l'ire particle size distribution for 'V2 should be as follows-
D 16 - 20
D ~ ~ _ 7;
l)~0 - 13{)
1)H4 - 2(?0
I)q - 00
How was the particle range in the sediment transport calculations and morphological table obtained?
l he particle range in the; Scdintetrt "1'ranspc>rt i5 l~aseil on Shield's Curve and Ras<~en's Modified Shicld~s
C'nrve. The Icnv end is from Sl~icld's t -urt e, which tends to under prechct; and the high end is from
Ros7en's 'tilodiLied Shield's Curve. ~vlrich tends to over prechct. The values hated. in mor~~hological table
~~ere detcrtnned by using the values fi-orn the Sedimcnt'I'ransport and what was observed in tltc field.

Why is there a D1, D3, I1, I2, JI, J2, N1 and N2 in the morphological tables?
1 i~c <>ni} diffe;rua~ce in <~Il cat` thc,e sites is the slc>Iz~;. 1'c~r ]) I ailci i)3, I)t is fc~r ui~stream of cuivc;rt aiui I>3
is ttn~ dge~~~~5trearn. For Il and I2; II is the pt~r[ion f~r~rra the be gumir~g to ~~ppr~~:i~l7atel} i i-i ;t3 and I2 is
fr<~rrt <~ppro~iniatelj- i I 5t) tc> the: end. Tiic valley' begins tc? narro~~~ anti gets steeper, sc> the: strea~~l slc7~je
uas chan~~ed. I~c?~~ .TI and J2, J 1 is upatream of the culvert under Y-11 and J2 is cic>unstrea~n oPthe cuieer~t.
l t}r '~ i .end \?, '~ l is upstrea~~l oI~ the cui~~ert and '~2 is dc>~~~nstream of the ct~h crt.