HomeMy WebLinkAboutFDP202100003 Calculations 2021-11-23 (2)NYSTROM DRIVEWAY CROSSING
Results:
The flood plain development (bridging the perennial stream) for driveway access on TMP
7-29A does not impact the 100yr WSE. The installation of the bridge, the approach ramp,
driveway gravel and bridge volumes will be offset by the volume of earth removal along
the same cross section path, keeping both cross -sections and volumes equal before
construction as well as after construction. The plans and forms are submitted
concurrently with this certification.
The predeveloped and post -developed WSE is unaffected for river station 7+89 for Buck
Mountain Creek and 5+91 for Muddy run. The upstream property is free of modeled
inundation for the 10yr post -developed condition.
Stream Designation
River Sta
10 yr (cfs)
W.S. Elev
Buck Mountain Creek Pre -developed
6+65
1,992
696.46'
Buck Mountain Creek Post -developed
6+65
1,992
696.53'
Buck Mountain Creek Pre -developed
7+89
1,992
698.09'
Buck Mountain Creek Post -developed
7+89
1,992
698.09'
Muddy Run Pre -developed
4+93
440
697,49'
Muddy Run Post -developed
4+93
440
697.59'
Muddy Run Pre -developed
5+91
440
700.15'
Muddy Run Post -developed
5+91
440
700.15'
The Cut/Fill Analysis shows that we have a net excess of 51.22 cuyd of Cut.
Bridge length = 35', Bridge width = 10', Bridge depth = 1.5'
Bridge Volume = 19.4 cuyd
2 Bridge Volume = 38.8 cuyd
Cut/Fill Report in 100yr floodplain = 51.22 excess cut
51.22 cuyd > 38.8 cuyd
Fill volume has been offset by the cut volume including the volume of the bridges.
Therefore, there will be no rise in the 100 yr floodplain for this project.
Page 1 of 1
Cut/Fill Report
Generated: 2021-03-04 10:37:47
By user: DGreene
Q:\RGA\TMPROJ\20.1962 - Nystrom Driveway
Drawing: Crossing\DWG\Q:\RGA\TMPROJ\20.1962 - Nystrom Driveway
Crossing\DWG\DRIVEWAY PLAN-20210122.dwg
Volume Summary
Name
Type
Cut
Fill
2d Area
Cut
Fill
Net
Factor
Factor
(acres)
(Cu. Yd.)
(Cu. Yd.)
(Cu. Yd.)
EW
20210217
full
1.000
1.150
0.571
165.71
114.49*
51.22*
Totals
2d Area
(acres)
Cut
(Cu. Yd.)
Fill
(Cu. Yd.)
Net
(Cu. Yd.)
Total
0.571
165.71
114.49*
51.22*
* Value adjusted by cut or fill factor other than 1.0
file:///C:/Users/dgreene/AppData/Local/Temp/CutFillReport.xml 3/4/2021