8130 EVERGREEN WAY BASE FILE 2018-01-01 MF Import

APPENDIX A Stream Bank Erosion Control Calculations Project precipitation values: 6 month 0.99 in. 2Y� 1.55 10Y� 2.25 25 yr 2.60 100 yr 325 Existing Event Summary: BasinlD Peak Q Peak T Peak Vol Arc.a Mathod ------- (cts) (hrs) (ac-tt) ac /Loss Existing 0.08 8.50 0.0464 0.97 SCS/SCS Exisling 0.18 8.33 0.0881 0.97 SCS/SCS F�cisting 0.34 8.33 0.1552 0.97 SCS/SCS Drainage Area: Existing Hyd Methcd: SCS Unit Hyd Peak Factor: 484.00 Storm Dur 24.00 hrs Area CN Pervious 0.8600 ac 85.00 Impervious 0.1190 ac 98.00 Total C0.9700ac- Supporting Data: Pervious CN Data: Open Space (Grass cover> 75%) Impervious CN Data: Paved 98.00 Pervious TC Data: Flow type: Description: Sheet Overland Flow Shallow Overland Flo�v Impervious TC Data: Flow type: Description: Sheet Paved Sheet Overiand Flow Raintype Event TYPE7A 2yr lYPE1A 10yr TYPEIA t00yr Loss Methad: SCS CN Number SCS Abs: 0.20 ,4 TC ,Gh �� ' 0.67 hfS �„�/S �✓� 0.72 hrs ,n� � �ru/' � v 1 .. �� C' F- - � i, i��' y� 7 o ��-� 85.00 0.8600 ac 0.1100 ac Length: Slope: 300.00 ft 1.73% 20.00 it 0.50% Length: Slope: 20.00 ft 0.50% 280.00 ft 1.30% Coeff: Travel Time 0.1700 39.71 min 11.0000 0.29 min Coeff: Travel Time 0.0100 0.78 min 0.1700 42.73 min Proposed Event Summary: IBasinlD Feak Q Peak T Peak Vol Area Method P�or�s� o ii� e oo � o osi�� o s� scs�scs Proposed 0.4[ 8.00 0.1a54 0.97 SCS/SCS I Proposed 0.65 8.00 02225 0.97 SCS/SCS Drainage Area: Proposed Hyd Method: SCS Unit Hyd Peak Factor: 484.00 Storm Dur 24.00 hrs Area CN Pervious 0.2100 ac 86.00 Impervious 0.7600 ac 98.00 Total �0:9700 2c Supporting Datac Raintype Event Tvrein zy, TYPEIA 10yr TYPEIA 100yr Loss Method: SCS CN Number SCS Abs: 0.20 TC 0.27 hrs 0.11 hrs Q:10?pGl\Cicil\8nginccr�kcpans�Ap�xndiz A_mplified.Joc 5/29/2003 Pagc I of 3 10