20070295 Ver 6_1.01 Summary of Results_20191220

Holding Village - North Lake SUMMARY OF RESULTS Maria Torres, E.I.
RAP-19000 Daniel Gunter
12.16.2019
RELEASE RATE MANAGEMENT RESULTS
POA-1
Return Period
Pre-Dev
[cfs]
Post-Dev
[cfs]
% Increase
1-Year
19.94
19.70
2-Year
26.99
26.45
-2%
10-Year
44.48
42.00
-6%
J-4
Return Period
Pre-Dev
[cfs]
Post-Dev
[cfs]
% Increase
[%] _
-14%
1-Year
6.65
5.72
2-Year
15.71
11.16
-29%
10-Year
49.65
46.42
-7%
J-5
Return Period
Pre-Dev
[cfs]
Post-Dev
[cfs]
% Increase
[%]
1-Year
4.85
2.69
-45%
2-Yea r
11.53
5.71
-50%
10-Year
35.71
24.75
-31%
J-6
Return Period
Pre-Dev
[cfs]
Post-Dev
[cfs]
% Increase
[%] _
-25%
1-Year
1.97
1.48
2-Year
4.54
3.25
-28%
10-Year
13.42
9.68
-28%
J-7
Return Period
Pre-Dev
[cfs]
Post-Dev
[cfs]
% Increase
[%] IL
1-Year
1.78
1.17
-34%
2-Year
3.94
2.66
-32%
10-Year
11.15
7.75
-30%

Holding Village - North Lake SUMMARY OF RESULTS Maria Torres, E.I.
RAP-19000 Daniel Gunter
12.16.2019
STORMWATER CONTROL MEASURE "A" SUMMARY
Design Drainage Area =
18.69
ac
Design Impervious Area =
10.31
ac
% Impervious =
55.2%
Top of Dam =
280.50
ft
NWSE =
274.00
ft
Average Depth =
4.54
ft
WQv Ponding Elevation =
275.70
ft
Required Surface Area at NWSE =
12,333
sf
Provided Surface Area at NWSE =
14,824
sf
WQv Orifice Diameter =
3.00
in
WQv Orifice Invert Elevation =
274.00
ft
Riser Size =
5' x 5'
Riser Crest =
278.50
ft
Number of Orifices =
1
Orifice Bottom Elevation =
276.00
ft
Orifice Diameter =
8.00
in
Number of Orifices =
2
Orifice Bottom Elevation =
276.75
ft
Orifice Area =
1.50
sf
Barrel Diameter =
36
in
# of Barrels =
1
Upstream Invert =
273.00
ft
Downstream Invert =
272.00
ft
Length =
47.5
ft
Slope =
0.0211
ft/ft
STORMWATER CONTROL MEASURE "A" ROUTING
RESULTS
Return Period
Inflow
[cfs]
Outflow
[cfs]
Max. WSE
[ft]
Freeboard
[ft]
1-Year
41.85
1.03
276.54
3.96
2-Year
56.12
4.09
276.92
2.24
10-Year
88.55
17.74
278.10
2.24
100-Year
128.56
61.62
1 279.34
1.16
*** See narrative for explanation of the modeled worst case scenario

Holding Village - North Lake SUMMARY OF RESULTS Maria Torres, E.I.
RAP-19000 Daniel Gunter
12.16.2019
STORMWATER CONTROL MEASURE "B" SUMMARY
Design Drainage Area =
12.98
ac
Design Impervious Area =
7.90
ac
% Impervious =
60.9%
Top of Dam =
270.00
ft
NWSE =
264.00
ft
Average Depth =
4.86
ft
WQv Ponding Elevation =
265.76
ft
Required Surface Area at NWSE =
8,791
sf
Provided Surface Area at NWSE =
9,855
sf
WQv Orifice Diameter =
2.50
in
WQv Orifice Invert Elevation =
264.00
ft
Riser Size =
5' x 5'
Riser Crest =
268.00
ft
Number of Orifices =
1
Orifice Bottom Elevation =
266.00
ft
Orifice Diameter =
8.00
in
Number of Weirs =
1
Weir Bottom Elevation =
267.50
ft
Weir Length =
4.00
ft
Barrel Diameter =
36
in
# of Barrels =
1
Upstream Invert =
261.00
ft
Downstream Invert =
260.00
ft
Length =
54.5
ft
Slope =
0.0183
ft/ft
STORMWATER CONTROL MEASURE "B" ROUTING
RESULTS
Return Period
Inflow
[cfs]
Outflow
[cfs]
Max. WSE
[ft]
Freeboard
[ft]
1-Year
32.44
0.97
266.57
3.43
2-Year
65.14
13.98
267.16
2.84
10-Year
65.14
13.98
268.22
1.78
100-Year
1 92.49
60.06
268.87
1.13
*** See narrative for explanation of the modeled worst case scenario

Holding Village - North Lake SUMMARY OF RESULTS Maria Torres, E.I.
RAP-19000 Daniel Gunter
12.16.2019
STORMWATER CONTROL MEASURE "C" SUMMARY
Design Drainage Area =
9.45
ac
Design Impervious Area =
5.07
ac
% Impervious =
53.6%
Top of Dam =
318.00
ft
NWSE =
312.00
ft
Average Depth =
3.47
ft
WQv Ponding Elevation =
313.52
ft
Required Surface Area at NWSE =
7,243
sf
Provided Surface Area at NWSE =
7,528
sf
WQv Orifice Diameter =
2.25
in
WQv Orifice Invert Elevation =
312.00
ft
Riser Size =
4' x 4'
Riser Crest =
316.00
ft
Number of Orifices =
1
Orifice Bottom Elevation =
313.80
ft
Orifice Diameter =
4.00
in
Orifice Area=
0.5
sf
Barrel Diameter =
24
in
# of Barrels =
1
Upstream Invert=
311.00
ft
Downstream Invert=
310.00
ft
Length =
47
ft
Slope =
0.0213
ft/ft
STORMWATER CONTROL MEASURE "C" ROUTING
RESULTS
Return Period
Inflow
[cfs]
Outflow
[cfs]
Max. WSE
[ft]
Freeboard
[ft]
1-Yea r
22.38
1.03
312.15
5.85
2-Year
29.69
2.06
314.64
3.36
10-Year
46.11
6.22
316.14
1.86
100-Year
1 66.2
32.10
316.76
1.24
*** See narrative for explanation of the modeled worst case scenario