2022 10 Drainage Statement Signed

6 Hydrograph Report Hydraflow Hydrographs by Intelisolve v9.1 Monday, Oct 24, 2022 Hyd. No. 3 Existing Total Hydrograph type = Combine Peak discharge = 2.944 cfs Storm frequency = 2 yrs Time to peak = 724 min Time interval = 1 min Hyd. volume = 9,861 cuft Inflow hyds. = 1, 2 Contrib. drain. area = 1.050 ac Existing Total Q (cfs) Q (cfs) Hyd. No. 3 -- 2 Year 3.00 3.00 2.00 2.00 1.00 1.00 0.00 0.00 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Time (min) Hyd No. 3 Hyd No. 1 Hyd No. 2

7 Hydrograph Report Hydraflow Hydrographs by Intelisolve v9.1 Monday, Oct 24, 2022 Hyd. No. 5 Proposed Site (Impervious) Hydrograph type = SCS Runoff Peak discharge = 2.463 cfs Storm frequency = 2 yrs Time to peak = 724 min Time interval = 1 min Hyd. volume = 8,294 cuft Drainage area = 0.760 ac Curve number = 98 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = USER Time of conc. (Tc) = 2.00 min Total precip. = 3.44 in Distribution = Custom Storm duration = NOAA Atlas 14 Type-D.cds Shape factor = 484 Proposed Site (Impervious) Q (cfs) Q (cfs) Hyd. No. 5 -- 2 Year 3.00 3.00 2.00 2.00 1.00 1.00 0.00 0.00 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 Time (min) Hyd No. 5

8 Hydrograph Report Hydraflow Hydrographs by Intelisolve v9.1 Monday, Oct 24, 2022 Hyd. No. 6 Proposed Site (Pervious) Hydrograph type = SCS Runoff Peak discharge = 0.423 cfs Storm frequency = 2 yrs Time to peak = 724 min Time interval = 1 min Hyd. volume = 1,260 cuft Drainage area = 0.280 ac Curve number = 76 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = USER Time of conc. (Tc) = 2.00 min Total precip. = 3.44 in Distribution = Custom Storm duration = NOAA Atlas 14 Type-D.cds Shape factor = 484 Proposed Site (Pervious) Q (cfs) Q (cfs) Hyd. No. 6 -- 2 Year 0.50 0.50 0.45 0.45 0.40 0.40 0.35 0.35 0.30 0.30 0.25 0.25 0.20 0.20 0.15

0.25 0.20 0.20 0.15 0.15 0.10 0.10 0.05 0.05 0.00 0.00 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Time (min) Hyd No. 6

9 Hydrograph Report Hydraflow Hydrographs by Intelisolve v9.1 Monday, Oct 24, 2022 Hyd. No. 7 Proposed Total Hydrograph type = Combine Peak discharge = 2.886 cfs Storm frequency = 2 yrs Time to peak = 724 min Time interval = 1 min Hyd. volume = 9,553 cuft Inflow hyds. = 5, 6 Contrib. drain. area = 1.040 ac Proposed Total Q (cfs) Q (cfs) Hyd. No. 7 -- 2 Year 3.00 3.00 2.00 2.00 1.00 1.00 0.00 0.00 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Time (min) Hyd No. 7 Hyd No. 5 Hyd No. 6

10 Hydrograph Summary Report Hydraflow Hydrographs by Intelisolve v9.1 Hyd. Hydrograph Peak Time Time to Hyd. Inflow Maximum Total Hydrograph No. type flow interval peak volume hyd(s) elevation strge used description (origin) (cfs) (min) (min) (cuft) (ft) (cuft) 1 SCS Runoff 4.157 1 724 14,244 ---- ------ ------ Existing Site (Impervious) 2 SCS Runoff 0.532 1 724 1,573 ---- ------ ------ Existing Site (Pervious) 3 Combine 4.689 1 724 15,817 1, 2 ------ ------ Existing Total 5 SCS Runoff 3.761 1 724 12,888 ---- ------ ------ Proposed Site (Impervious) 6 SCS Runoff 0.882 1 724 2,590 ---- ------ ------ Proposed Site (Pervious) 7 Combine 4.643 1 724 15,477 5, 6 ------ ------ Proposed Total 2021-11-01 2, 10, 100 yr.gpw Return Period: 10 Year Monday, Oct 24, 2022

11 Hydrograph Report Hydraflow Hydrographs by Intelisolve v9.1 Monday, Oct 24, 2022 Hyd. No. 1 Existing Site (Impervious) Hydrograph type = SCS Runoff Peak discharge = 4.157 cfs Storm frequency = 10 yrs Time to peak = 724 min Time interval = 1 min Hyd. volume = 14,244 cuft Drainage area = 0.840 ac Curve number = 98 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = USER Time of conc. (Tc) = 2.00 min Total precip. = 5.22 in Distribution = Custom Storm duration = NOAA Atlas 14 Type-D.cds Shape factor = 484 Existing Site (Impervious) Q (cfs) Q (cfs) Hyd. No. 1 -- 10 Year 5.00 5.00 4.00 4.00 3.00 3.00 2.00 2.00 1.00 1.00 0.00 0.00 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 Time (min) Hyd No. 1

12 Hydrograph Report Hydraflow Hydrographs by Intelisolve v9.1 Monday, Oct 24, 2022 Hyd. No. 2 Existing Site (Pervious) Hydrograph type = SCS Runoff Peak discharge = 0.532 cfs Storm frequency = 10 yrs Time to peak = 724 min Time interval = 1 min Hyd. volume = 1,573 cuft Drainage area = 0.210 ac Curve number = 70 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = USER Time of conc. (Tc) = 2.00 min Total precip. = 5.22 in Distribution = Custom Storm duration = NOAA Atlas 14 Type-D.cds Shape factor = 484 Existing Site (Pervious) Q (cfs) Q (cfs) Hyd. No. 2 -- 10 Year 1.00 1.00 0.90 0.90 0.80 0.80 0.70 0.70 0.60 0.60 0.50 0.50 0.40 0.40 0.30 0.30 0.20

0.40 0.30 0.30 0.20 0.20 0.10 0.10 0.00 0.00 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Time (min) Hyd No. 2

13 Hydrograph Report Hydraflow Hydrographs by Intelisolve v9.1 Monday, Oct 24, 2022 Hyd. No. 3 Existing Total Hydrograph type = Combine Peak discharge = 4.689 cfs Storm frequency = 10 yrs Time to peak = 724 min Time interval = 1 min Hyd. volume = 15,817 cuft Inflow hyds. = 1, 2 Contrib. drain. area = 1.050 ac Existing Total Q (cfs) Q (cfs) Hyd. No. 3 -- 10 Year 5.00 5.00 4.00 4.00 3.00 3.00 2.00 2.00 1.00 1.00 0.00 0.00 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Time (min) Hyd No. 3 Hyd No. 1 Hyd No. 2