20061804 Ver 23_Pre vs. Post Wet Pond_20180619

Watershed Model Schematic
ydraflow Hydrographs Extension for AutoCAIDO Civil 3DB 2018 by Autodesk, Inc. v12
Project: Pre vs Post Bioretention.gpw Friday, 06/1 /2018

Hydrograph eturn Peri® cRa
y era ow ydrographs Extension for AutoCAD®Civil 3D®2018 by Autodesk, Inc. v12
Hyd.
Hydrograph
Inflow
Peak Outflow (cfs)
Hydrograph
No.
type
hyd(s)
Description
(origin)
1 -yr
2 -yr
3 -yr
5 -yr
10 -yr
25 -yr
50 -yr
100 -yr
1
SCS Runoff
------
0.190
-------
-------
-------
-------
-------
-------
-------
Pre Development
2
SCS Runoff
------
5.719
-------
-------
-------
-------
-------
-------
-------
Post Development
3
Reservoir
2
0.038
-------
-------
-------
-------
-------
-------
-------
Pond Outflow
Proj. file: Pre vs Post Bioretention.gpw
Friday, 06 / 1 / 2018

Hydrograph Summary ep®9ydraflow Hydrographs Extension for AUtOCADO Civil 3D& 2018 by Autodesk, Inc. 02
Hyd.
No.
Hydrograph
type
(origin)
Peak
flow
(cfs)
Time
interval
(min)
Time to
Peak
(min)
Hyd.
volume
(cult)
Inflow
hyd(s)
Maximum
elevation
(ft)
Total
strge used
(cuft)
Hydrograph
Description
I
SCS Runoff
0.190
1
719
998
------
------
------
Pre Development
2
SCS Runoff
5.719
1
715
10,306
------
------
------
Post Development
3
Reservoir
0.038
1
915
965
2
227.90
52040
Pond Outflow
Pre vs Post Bioretention.gpw
Return Period: 1 Year
Friday, 06 / 1 / 2018

4
Hydrograph Report
Hydraflow Hydrographs Extension for AutoCAD® Civil 3D@2018 by Autodesk, Inc. v12 Friday, 06 /1 / 2018
Hyd. No. 3
Pond Outflow
Hydrograph type = Reservoir Peak discharge = 0.038 cfs
Storm frequency = 1 yrs Time to peak = 15.25 hrs
Time interval = 1 min Hyd. volume = 965 cuft
Inflow hyd. No. = 2 -Post Development Max. Elevation = 227.90 ft
Reservoir name = Wet Detention Pond #2 Max. Storage = 5,040 cuft
Storage Indication method used. Exfiltration extracted from Outflow
Q (cfs)
6.00
5.00
4.00
3.00
2.00
0.00
Hyd No. 3
Pond Outflow
Hyd. No. 3 --1 Year
6 9 33
12 15
18 21
24
27 30
— Hyd
No. 2
® Total
storage used
= 5,040 cuff
4.00
3.00
2.00
1.00
0.00
0 3
Time (hrs)

Pond Report 5
Hydraflow Hydrographs Extension for AutoCAD@ Civil 3DOD 2018
by Autodesk, Inc. v12
Friday, 06 / 1 / 2018
Pond No. 1 - Wet Detention
Pond #2
Pond Data
[A]
[B]
Contours -User-defined contour areas. Average end area method used for volume calculation.
Begining Elevation = 227.00 it
Stage / Storage Table
[A]
[B]
[C]
Stage (ft) Elevation (ft)
Contour area (sqft)
Incr. Storage (tuft) Total storage (cult)
0.00 227.00
21826
0
0
1.00 221.00
41390
31608
3,608
2.00 222.00
53351
4,871
81479
3.00 223.00
6,426
51889
14,367
3.50 230.50
71783
3,552
17,919
Culvert / Orifice Structures
Weir Structures
[A]
[B]
[C]
[PrfRSr]
[A]
[B]
[C]
[D]
Rise (in)
= 24.00
1.25
0.00
0.00
Crest Len (ft) =
10.00
10.00
0.00
0.00
Span (in)
= 24.00
1.25
0.00
0.00
Crest EL (ft) =
229.65
230.00
0.00
0.00
No. Barrels
= 1
1
0
0
Weir Coeff. =
3.33
2.60
3.33
3.33
Invert EI. (ft)
= 224.00
227.00
0.00
0.00
Weir Type =
1
Broad
--
---
Length (ft)
= 32.00
0.10
0.00
0.00
Multi -Stage =
Yes
No
No
No
Slope (%)
= 6.58
0.10
0.00
n/a
N -Value
= .013
.013
.013
n/a
Orifice Coeff.
= 0.60
0.60
0.60
0.60
EXfil.(in/hr) =
3.500 (by
Contour)
Multi -Stage
= n/a
Yes
No
No
TW Elev. (ft) =
0.00
Note. CulveNOrrfice outflows are analyzed under inlet (is) and outlet (so) control. Weir risers checked for
orifice conditions(ic)
and submergence (s)
Stage (ft)
Bt[He;
2.00
rm
Stage I Discharge
0.00 4.00 8.00 12.00
16.00
20.00
24.00
28.00
32.00
Elev (ft)
231.00
230.00
229.00
228.00
22
7.00
36.00
Discharge (c
Total Qfs)