EX Pool 8 Full Matarrazo Drainage System Approved by Town 3623

2 Year Routing Page 9 Hydrograph Discharge Table Time Inflow Elevation ClvA ClvB ClvC ClvD WrA WrB WrC WrD_ Outflow (hrs) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs 23.93 0.01 608.10 0.01 0.01 23.97 0.01 608.10 0.01 0.01 24.00 0.01 608.10 0.01 0.01 24.03 0.01 608.10 0.01 0.01 24.07 0.00 608.10 0.01 0.01 24.10 0.00 608.10 0.01 0.01 24.13 0.00 608.09 0.01 0.01 24.17 0.00 608.09 0.01 0.01 24.20 0.00 608.09 0.01 0.01 24.23 0.00 608.09 0.01 0.01 24.27 0.00 608.08 0.01 0.01 24.30 0.00 608.08 0.01 0.01 24.33 0.00 608.08 0.01 0.01 24.37 0.00 608.08 0.01 0.01 24.40 0.00 608.08 0.01 0.01 24.43 0.00 608.07 0.01 0.01 24.47 0.00 608.07 0.01 0.01 24.50 0.00 608.07 0.01 0.01 24.53 0.00 608.07 0.01 0.01 24.57 0.00 608.07 0.01 0.01 24.60 0.00 608.07 0.01 0.01 24.63 0.00 608.06 0.01 0.01 24.67 0.00 608.06 0.01 0.01 24.70 0.00 608.06 0.01 0.01 24.73 0.00 608.06 0.01 0.01 24.77 0.00 608.06 0.01 0.01 24.80 0.00 608.06 0.01 0.01 24.83 0.00 608.06 0.01 0.01 24.87 0.00 608.06 0.00 0.00 24.90 0.00 608.05 0.00 0.00 24.93 0.00 608.05 0.00 0.00 24.97 0.00 608.05 0.00 0.00 25.00 0.00 608.05 0.00 0.00 25.03 0.00 608.05 0.00 0.00 25.07 0.00 608.05 0.00 0.00 25.10 0.00 608.05 0.00 0.00 25.13 0.00 608.05 0.00 0.00 25.17 0.00 608.05 0.00 0.00 25.20 0.00 608.05 0.00 0.00 25.23 0.00 608.04 0.00 0.00 25.27 0.00 608.04 0.00 0.00 25.30 0.00 608.04 0.00 0.00 25.33 0.00 608.04 0.00 0.00 25.37 0.00 608.04 0.00 0.00 25.40 0.00 608.04 0.00 0.00 25.43 0.00 608.04 0.00 0.00 25.47 0.00 608.04 0.00 0.00 25.50 0.00 608.04 0.00 0.00 25.53 0.00 608.04 0.00 0.00 Continues on next page... RESPONSE TO OPRA 2024-53_ 000029

2 Year Routing Page 10 Hydrograph Discharge Table Time Inflow Elevation ClvA ClvB ClvC ClvD WrA WrB WrC WrD_ Outflow (hrs) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs 25.57 0.00 608.04 0.00 0.00 25.60 0.00 608.04 0.00 0.00 25.63 0.00 608.03 0.00 0.00 25.67 0.00 608.03 0.00 0.00 25.70 0.00 608.03 0.00 0.00 25.73 0.00 608.03 0.00 0.00 25.77 0.00 608.03 0.00 0.00 ..End RESPONSE TO OPRA 2024-53_ 000030

Q cfs 3 - Reservoir - 2 Yr - Qp = 0.34 cfs 1.5 7 Hyd. 2 1.0 0.5 =] 7 Hyd. 3 0.0 0 5 10 15 20 25 30 Time (hrs) RESPONSE TO OPRA 2024-53_ 000031

Hydrograph Report Page 1 English Hyd. No. 5 PREDEVELOPED INFLOW 10 Hydrograph type = SCS Runoff Peak discharge = 0.86 cfs Storm frequency = 10 yrs Time interval = 6 min Drainage area = 0.40 ac Curve number = 75 Basin Slope = 10% Hydraulic length = 100 ft Te method = USER Time of conc. (Te) = 15 min Total precip. = 5.30 in Distribution = Type Ill Storm duration = 24 hrs Shape factor = 484 Total Volume = 3,668 cuft Hydrograph Discharge Table Time -- Outflow Time -- Outflow Time -- Outflow Time -- Outflow (hrs cfs) (hrs cfs) (hrs cfs) (hrs cfs) 9.60 0.01 12.80 0.17 16.00 0.04 19.20 0.02 9.70 0.01 12.90 0.15 16.10 0.04 19.30 0.02 9.80 0.01 13.00 0.13 16.20 0.04 19.40 0.02 9.90 0.01 13.10 0.12 16.30 0.04 19.50 0.02 10.00 0.01 13.20 0.11 16.40 0.04 19.60 0.02 10.10 0.02 13.30 0.11 16.50 0.04 19.70 0.02 10.20 0.02 13.40 0.10 16.60 0.04 19.80 0.02 10.30 0.02 13.50 0.10 16.70 0,04 19.90 0.02 10.40 0.02 13.60 0.10 16.80 0.04 20.00 0.02 10.50 0.02 13.70 0.09 16.90 0.04 20.10 0.02 10.60 0.03 13.80 0.09 17.00 0.04 20.20 0,02 10.70 0.03 13.90 0.09 17.10 0.03 20.30 0.02 10.80 0.03 14.00 0.08 17.20 0.03 20.40 0.02 10.90 0.04 14.10 0.08 17.30 0.03 20.50 0.02 11.00 0.04 14.20 0.08 17.40 0.03 20.60 0.02 11.10 0.04 14.30 0.07 17.50 0.03 20.70 0.02 11.20 0.05 14.40 0.07 17.60 0.03 20.80 0.02 11.30 0,05 14.50 0.07 17.70 0.03 20.90 0.02 11.40 0.06 14.60 0.07 17.80 0.03 21.00 0.02 11.50 0.07 14.70 0.07 17.90 0.03 21.10 0.02 11.60 0.09 14.80 0.07 18.00 0.03 21.20 0.02 11.70 0.13 14.90 0.06 18.10 0.03 21.30 0.02 11.80 0.19 15.00 0.06 18.20 0.03 21.40 0.02 11.90 0.29 16.10 0.06 18.30 0.03 21.50 0.02 12.00 0.48 15.20 0.06 18.40 0.03 21.60 0,02 12.10 0.76 15.30 0.06 18.50 0.03 21.70 0.02 12.20 0.86<< 15.40 0.06 18.60 0.02 21.80 0.02 12.30 0.74 15.50 0.05 18.70 0.02 21.90 0.02 12.40 0.56 15.60 0.05 18.80 0.02 22.00 0.02 12.50 0.39 15.70 0.05 18.90 0.02 22.10 0.02 12.60 0.29 15.80 0.05 49.00 0.02 22.20 0.02 12.70 0.21 15.90 0.05 19.10 0.02 22.30 0.02 Continues on next page... RESPONSE TO OPRA 2024-53_ 000032

PREDEVELOPED INFLOW 10 Page 2 Hydrograph Discharge Table Time -- Outflow (hrs cfs) 22.40 0.02 22.50 0.02 22.60 0.02 22.70 0.02 22.80 0.02 22.90 0.02 23.00 0.02 23.10 0.02 23.20 0.02 23.30 0.02 23.40 0.02 23.50 0.02 23.60 0.02 23.70 0.01 23.80 0.01 23.90 0.01 24.00 0.01 24.10 0.01 End RESPONSE TO OPRA 2024-53_ 000033

5 - SCS Runoff - 10 Yr - Qp = 0.86 cfs 1.0 0.8 » 06 x2) 7 Hyd. 5 Co 0.4 | 0.2 w _————, 0.0 — t 0 5 10 15 20 25 Time (hrs) RESPONSE TO OPRA 2024-53_ 000034

Hydrograph Report Page 1 English Hyd. No. 6 DEVELOPED INFLOW 10 Hydrograph type = SCS Runoff Peak discharge = 2.00 cfs Storm frequency = 10 yrs Time interval = 2 min Drainage area = 0.40 ac Curve number = 98 Basin Slope = 10% Hydraulic length = 100 ft Tc method = USER Time of conc. (Te) = 5 min Total precip. = 5.30 in Distribution = Type Ill Storm duration = 24 hrs Shape factor = 484 Total Volume = 6,892 cuft Hydrograph Discharge Table Time -- Outflow Time -- Outflow Time -- Outflow Time -- Outflow (hrs cfs) (hrs cfs) (hrs cfs) (hrs cfs) 4.30 0.02 5.37 0.02 6.43 0.03 7.50 0.04 4.33 0.02 5.40 0.02 6.47 0.03 7.53 0.04 4.37 0.02 5.43 0.03 6.50 0.03 7.57 0.04 4.40 0.02 5.47 0.03 6.53 0.03 7.60 0.04 443 0.02 5.50 0.03 6.57 0.03 7.63 0.04 447 0.02 5.53 0.03 6.60 0.03 7.67 0.04 4.50 0.02 5.57 0.03 6.63 0.03 7.70 0.04 4.53 0.02 5.60 0.03 6.67 0.03 7.73 0.04 4.57 0.02 5.63 0.03 6.70 0.03 7.77 0.05 4.60 0.02 5.67 0.03 6.73 0.03 7.80 0.05 4.63 0.02 5.70 0.03 6.77 0.03 7.83 0.05 4.67 0.02 5.73 (0.03 6.80 0.04 7.87 0.05 4.70 0.02 5.77 0.03 6.83 0.04 7.90 0.05 4.73 0.02 5.80 0.03 6.87 0.04 7.93 0.05 477 0.02 5.83 0.03 6.90 0.04 7.97 0.05 4.80 0.02 5.87 0.03 6.93 0.04 8.00 0.05 4.83 0.02 5.90 0.03 6.97 0.04 8.03 0.05 4.87 0.02 5.93 0.03 7.00 0.04 8.07 0.05 4.90 0.02 5.97 0.03 7.03 0.04 8.10 0.05 4.93 0.02 6.00 0.03 7.07 0.04 8.13 0.05 4.97 0.02 6.03 0.03 7.10 0.04 8.17 0.05 5.00 0.02 6.07 0.03 7.13 0.04 8.20 0.05 5.03 0.02 610 0.03 TAT 0.04 8.23 0.05 5.07 0.02 613 0.03 7.20 0.04 8.27 0.05 5.10 0.02 617 0.03 7.23 0.04 8.30 0.05 5.13 0.02 6.20 0.03 7.27 0.04 8.33 0.05 5.17 0.02 6.23 0.03 7.30 0.04 8.37 0.06 5.20 0.02 6.27 0.03 7.33 0.04 8.40 0.06 5.23 0.02 6.30 0.03 7.37 0.04 8.43 0.06 5.27 0.02 6.33 0.03 7.40 0.04 8.47 0.06 5.30 0.02 6.37 0.03 7.43 0.04 8.50 0.06 5.33 0.02 640 0.03 TAT 0.04 8.53 0.06 Continues on next page. RESPONSE TO OPRA 2024-53_ 000035

DEVELOPED INFLOW 10 Page 2 Hydrograph Discharge Table Time -- Outflow Time -- Outflow Time -- Outflow Time -- Outflow (hrs cfs) (hrs cfs) (hrs cfs) (hrs cfs) 8.57 0.06 10.20 0.10 11.83 0.71 13.47 0.13 8.60 0.06 10.23 0.10 11.87 0.77 13.50 0.12 8.63 0.06 10.27 0.11 11.90 0.83 13.53 0.12 8.67 0.06 10.30 0.11 11.93 0.93 13.57 0.12 8.70 0.06 10.33 0.11 11.97 1.16 13.60 0.12 8.73 0.06 10.37 0.11 12.00 1.54 13.63 0.12 8.77 0.06 10.40 011 12.03 1.90 13.67 0.12 8.80 0.07 10.43 0.11 12.07 2.00<< 13.70 0.12 8.83 0.07 10.47 0.11 12.10 1.77 13.73 0.11 8.87 0.07 10.50 0.12 12.13 1.39 13.77 0.11 8.90 0.07 10.53 0.12 12.17 1.07 13.80 0.11 8.93 0.07 10.57 0.12 12.20 0.90 13.83 0.11 8.97 0.07 10.60 0.12 12.23 0.81 13.87 0.11 9,00 0.07 10.63 0.12 12.27 0.76 13.90 0.11 9.03 0.07 10.67 0.12 12.30 0.70 13.93 0.10 9.07 0.07 10.70 0.13 12.33 0.64 13.97 0.10 9.10 0.07 10.73 0.13 12.37 0.58 14.00 0.10 9.13 0.07 10.77. 0.13 12.40 0.52 14.03 0.10 9.17 0.07 10.80 0.13 12.43 0.46 14.07 0.10 9.20 0.07 10.83 0.13 1247 0.40 14.10 0.10 9.23 0.08 10.87 0.13 12.50 0.35 14.13 0.10 9.27 0.08 10.90 0.14 12.53 0.29 1417 0.10 9.30 0.08 10.93 0.14 12.57 0.25 14.20 0.09 9.33 0.08 10.97 0.14 12.60 0.23 14.23 0.09 9.37 0.08 11.00 0.14 12.63 0.22 14.27 0.09 9.40 0.08 11.03 0.14 12.67 0.22 14.30 0.09 9.43 0.08 11.07 0.15 12.70 0.21 14.33 0.09 9.47 0.08 11.10 0.15 12.73 0.21 14.37 0.09 9.50 0.08 11.13 0.16 12.77 0.20 1440 0.09 9.53 0.08 1117 0.16 12.80 0.19 14.43 0.09 9.57 0.08 11.20. 0.17 12.83 0.19 1447 0.09 9.60 0.08 11.23 0.18 12.87 0.18 14.50 0.09 9.63 0.09 11.27 0.18 12.90 0.18 14.53 0.09 9.67 0.09 11.30 0.19 12.93 0.17 14.57 0.09 9.70 0.09 11.33 0.19 12.97 0.16 14.60 0.09 9.73 0.09 11.37 0.20 13.00 0.16 14.63 0.08 9.77 0.09 11.40 0.24 13.03 0.15 14.67 0.08 9.80 0.09 11.43 0.21 13.07 0.15 14.70 0.08 9.83 0.09 11.47 0.22 13.10 0.14 14.73 0.08 9.87 0.09 11.50 0.22 13.13 0.14 14.77 0.08 9.90 0.09 11.53 0.24 13.17 0.14 14.80 0.08 9.93 0.09 11.57 0.26 13.20 0.14 14.83 0.08 9.97 0.09 11.60 0.31 13.23 0.14 14.87 0.08 10.00 0.09 11.63 0.36 13.27 0.14 14.90 0.08 10.03 0.09 11.67 0.42 13.30 0.13 14.93 0.08 10.07 0.10 11.70 0.48 13.33. 0.13 14.97 0.08 10.10 0.10 11.73 0.54 13.37 0.13 15.00 0.08 10.13 0.10 1.77 0.59 13.40 0.13 15.03 0.08 10.17 0.10 11.80 0.65 13.43 0.13 15.07 0.07 Continues on next page... RESPONSE TO OPRA 2024-53_ 000036

DEVELOPED INFLOW 10 Page 3 Hydrograph Discharge Table Time -- Outflow Time -- Outflow Time -- Outflow Time -- Outflow (hrs cfs) (hrs cfs) (hrs cfs) (hrs cfs) 15.10 0.07 16.73 0.05 18.37 0.03 20.00 0.03 16.13 0.07 16.77 0.04 18.40 0.03 20.03 0.03 15.17 0.07 16.80 0.04 18.43 0.03 20.07 0.03 15.20 0.07 16.83 0.04 18.47 0.03 20.10 0.03 15.23 0.07 16.87 0.04 18.50 0.03 20.13 0.03 15.27 0.07 16.90 0.04 18.53 0.03 20.17 0.03 15.30 0.07 16.93 0.04 18.57 0.03 20.20 0.03 15.33 0.07 16.97 0.04 18.60 0.03 20.23 0.03 15.37 0.07 17.00 0.04 18.63 0.03 20.27 0.03 15.40 0.07 17.03 0.04 18.67 0.03 20.30 0.03 15.43 0.07 17.07 0.04 18.70 0.03 20.33 0.03 15.47 0.07 17.10 0.04 18.73 0.03 20.37 0.03 15.50 0.06 17.13 0.04 18.77 0.03 20.40 0.02 15.53 0.06 TAF 0.04 18.80 0.03 20.43 0.02 15.57 0.06 17.20 0.04 18.83 0.03 20.47 0.02 15.60 0.06 17.23 0.04 18.87 0.03 20.50 0.02 15.63 0.06 17.27 0.04 18.90 0.03 20.53 0.02 15.67 0.06 17.30 0.04 18.93 0.03 20.57 0.02 15.70 0.06 17.33 0.04 18.97 0.03 20.60 0.02 15.73 0.06 17.37 0.04 19.00 0.03 20.63 0.02 15.77 0.06 17.40 0.04 19.03 0.03 20.67 0.02 15.80 0.06 17.43 0.04 19.07 0.03 20.70 0.02 15.83 0.06 17.47 0.04 19.10 0.03 20.73 0.02 15.87 0.06 17.50 0.04 19.13 0.03 20.77 0.02 15.90 0.06 17.53 0.04 19.17 0.03 20.80 0.02 15.93 0.05 17.57 0.04 19.20 0.03 20.83 0.02 15.97 0.05 17.60 0.04 19.23 0.03 20.87 0.02 16.00 0.05 17.63 0.04 19.27 0.03 20.90 0.02 16.03 0.05 17.67 0.04 19.30 0.03 20.93 0.02 16.07 0.05 17.70 0.04 19.33 0.03 20.97 0.02 16.10 0.05 17.73 0.04 19.37 0.03 21.00 0.02 16.13 0.05 17.77 0.03 19.40 0.03 21.03 0.02 16.17 0.05 17.80 0.03 19.43 0.03 21.07 0.02 16.20 0.05 17.83 0.03 19.47 0.03 21.10 0.02 16.23 0.05 17.87 0.03 19.50 0.03 21.13 0.02 16.27 0.05 17.90 0.03 19.53 0.03 21.17 0.02 16.30 0.05 17.93 0.03 19.57 0.03 21.20 0.02 16.33 0.05 17.97 0.03 19.60 0.03 . 21.23 0.02 16.37 0.05 18.00 0.03 19.63 0.03 21.27 0.02 16.40 0.05 18.03 0.03 19.67 0.03 21.30 0.02 16.43 0.05 18.07 0.03 19.70 0.03 21.33 0.02 16.47 0.05 18.10 0.03 19.73 0.03 21.37 0.02 16.50 0.05 18.13 0.03 19.77 0.03 21.40 0.02 16.53 0.05 18.17 0.03 19.80 0.03 21.43 0.02 16.57 0.05 18.20 0.03 19.83 0.03 21.47 0.02 16.60 0.05 18.23 0.03 19.87 0.03 21.50 0.02 16.63 0.05 18.27 0.03 19.90 0.03 21.53 0.02 16.67 0.05 18.30 0.03 19.93 0.03 21.57 0.02 16.70 0.05 18.33 0.03 19.97 0.03 21.60 0.02 Continues on next page... RESPONSE TO OPRA 2024-53_000037

DEVELOPED INFLOW 10 Page 4 Hydrograph Discharge Table Time -- Outflow (hrs cfs) 21.63 0.02 21.67 0.02 21.70 0.02 21.73 0.02 21.77 0.02 21.80 0.02 21.83 0.02 21.87 0.02 21.90 0,02 21.93 0.02 21.97 0.02 22.00 0.02 22.03 0.03 22.07 0.04 22.10 0.03 22.13 0.03 22.17 0.02 22.20 0.02 22.23 0.02 22.27 0.02 22.30 0.02 22.33 0.02 22.37 0.02 22.40 0.02 22.43 0.02 22.47 0.02 22.50 0.02 22.53 0.02 22.57 0.02 22.60 0.02 22.63 0.02 22.67 0.02 22.70 0.02 ..End RESPONSE TO OPRA 2024-53_ 000038