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HomeMy WebLinkAbout1997-11-20 Hydrologic Analysis a 4 8s HYDROLOGIC ANALYSIS for MEDICAL OFFICES at THE CROSSROADS NORTH ANDOVER, MASSACHUSETIS Prepared by . 62 MONTVALE AVE. - SUITE I a STONEHAK MA. 02180 JULY 16, 1997 "& A (REV. SEPTEMBER 22, 199 ®��P��N gssgc (REV. NO ER 4, 1997) A G' � v 4 SON L ENG\ TABLE OF CONTENTS P HYDROGRAPHS 2-YEAR STORM EVENT 10-YEAR STORM EVENT 100-YEAR STORM EVENT DEI'EI\MON BASIN CHARACTERISTICS TB E OF CONCENTRATION CALCULATIONS RAINFALL I-D-F- CURVES I NARRATIVE GENERAL The purpose of this analysis is to evaluate the hydrologic impact of the construction of a medical office building and the expansion of an existing parking area at The Crossroads retail center on Route 114 in North Andover, Massachusetts (see Figure 1). For detailed information regarding existing site topography and proposed construction, refer to the Proposed Site Plans, prepared by Marchionda and Associates and dated July, 1997(rev November, 1997). INFORMATIONPROJECT The proposed project consists of the construction of a 3890 s.f single story building and expansion of an existing parking area_ Compared to the previously approved site plan for The Crossroads `v-ydth 60-10'x20' parking spaces in this rear area of the site), the proposed construction will result in a decrease in pavement area due to proposed 9'x18' parking spaces. Overall there is a 3200 s.f net increase in i ripervious area due to the roof of the proposed building. The existing detention area in the rear of the site was modified to accommodate the new parking layout and additional runoff from the slight increase of impervious area in the watershed. All rooftop runoff is directed to the modified detention area The proposed detention basin discharges to the same on-site drainage system as the existing basin, but the basin improvements result in lower discharge rates to the drainage system MKIBODOLOGY The hydrologic analysis begins with the determination of a study point and delineation of an area which drains to the study point. If necessary for analysis, the study area is divided into subcatchinent areas. Using watershed modeling techniques outlined in Section 4 of the Soil Conservation Service (S.C.S.) National Engineering Handbook and methods established in Technical Releases 20 and 55, peak stonnwater discharge is determined at the study point for 2, 10 and 100 year 24-hour storm events (which produce 3.1, 4.6 and 6.5 inches of rainfall, respectively). The analysis of the study area is repeated for post-development conditions and a stonnwater management system is designed to assure that existing conditions peak flows are not exceeded for any of the design storm events. 0.,�. /� . �-i 11....E •�- `� �� �''� Sl i E ,.1 -.�,a,,/� • ol Lj/ 47 C` I MARCHIONDA & ASSOC. , L.P. LOCUS PLAN ENGINEERING AND PLANNING CONSULTANTS THE CROSSROADS NORTH ANDOVER, MA 62 MONTVALE AVE. SUITE I STONEHAM, MA. 02180 (617) 438-6121 NOT TO SCALE DATE: 7/16/97 I- I G. 1 For both pre- and post-development hydrologic analyses, the 3.8 acre study area was subdivided into two subcatchments which each drain to the study point (an existing on-site 12" RCP). Figures 2 and 3 depict the subcatchment areas for pre-development and post- development conditions, respectively. For each subcatchment, the following table presents a coinparison of acreage, TR 55 curve number (CI), time of concentration (Tc) and peak discharge for each storm event: MSTING CONDMONS SC-1 Area(ac.) 1.3 CN 77 Tc(minutes) 30 Storm Event: 2 Year 10 Year 100 Year Peak Discharge: 0.96 2.00 3.45 SC-2 Area(ac.) 2.4 CN 85 Tc(minutes) 28 Storm Event 2 Year 10 Year 100 Year Peak Discharge: 2.75 4.92 7.56 Pia® COMMONS SC-3 Area(ac.) 1.4 CN 78 Tc(minutes) 26 Stoma Event: 2 Year 10 Year 100 Year Peak Discharge: 1.11 2.25 3.73 SC4 i Area(ac.) 2.4 CN 87 Tc(minutes) 28 Storm Event 2 Year 10 Year 100 Year Peak Discharge: 2.82 4.87 7.35 A� Z� o X g 65 o 0 1 /� w O PRE—DEVELOPMENT PRE—DEVELOPMENT THE CROSSROADS RC HC ONDDQ o ASSOC��G TES L.P. SUDC�Q`�C�N MC�I�TS s (� NORTH ANDOVER,MA ENGINEERING AND PLANNING CONSULTANTS u �(Go 2 62 MO TVALE AVE.,SUPTE I STONE HAM,MA 02i60 z Ag in n� z r X � 100 Q pOoSTmDEMEL��p�n/1C�1��' [�aG�C�G��OoNNDQ � Q��©C��G°a���eL.P.SUB C�G°a`�C�C�ME�ITS TC�G CROSSROADS �op ENGINEERING AND PLANNING CONSULTANTS (� FORTH ANDOVER,MA 62 M ALE AVE.,SUITE I Il— o STONE MA 02180 Figure 4 summarizes how the hydrographs for the subcatchments are routed and combined to calculate peak flows at the study point for pre- and post-development conditions. C)ONCLUSION The analyses indicate that the proposed, stonnwater management system is effective and this development will not cause an increase in peak stonnwater flows at the study point for the design storms. Presented below is a surnmary of the peak runoff discharges at the study point. SUMMARY OF PEAK FLO'"S PRE-DEVELOPMENT POST-DEVEURNIENT 2 Yr. Storm (ds) 10 Yr.Storm (ds) 190 Yr. stonn (cfs) 2 Yr. Stonn (ds). 10 Yr. Storm(ds) 100 Yr. Stan-n(ds) 3.54 6.03 9.00 3.47 5.70 8.31 I ' i PRE—DEVELOPMENT POST—DEVELOPMENT sc SC SC 1 2 3 4 Fr ROUTE ROUTE I - - _ (EXIST NO COMB (PROPOSED COMB DE7. BASIN) CET. BASIN) 0 1 z p Z � To U cn MARCHIONDA & ASSOC. , L.P. HYDROLOGY SEQUENCING ENGINEERING AND PLANNING CONSULTANTS THE CROSSROADS NORTH ANDOVER, MA 62 M,ONTVALE AVE. SUITE I STONEHAM, MA. 02180 (617) 438-6121 SCALE: NONE DATE: 7/16/97 A G. 4 k I APPENDIX i 2-YEAR STORM i 11/4/97 Page 1 HYDROGRAPH REPORT RECORD NUMBER 17 TYPE COMPUTED FLOOD DESCRIPTION SC-1, 2 YR [HYDROGRAPH INFORMATION] Peak Discharge......................... ... = 0.96 (cfs) Volume.................................... = 0.12 (acft) Time Interval. ............... ............. = S (min) Time to Peak.............................. = 740.00 (min) Time of Base.............................. = 1470.00 (min) Multiplication factor..................... = 1.00 (UNIT HYDROGRAPH INFORMATION] Unit hydrograph 4........... .............. = 1 Unit hydrograph type...................... = CURVILINEAR UH Peak Discharge.......... .................. = 3.02 (cfs) Shape Factor.............................. = 484.00 Time Interval............... .............. 5 (min) Time to Peak..................... .......... = 20.00 (min) Time of Base.............................. = 100.00 (min) Rainfall Excess......................... .. = 1.00 (in) Basin Lag Time......................... ... = 18.00 (min) [BASIN DESCRIPTION] [WEIGHTED WATERSHED AREA] --------------------------------------—-------------- DESCRIPTION AREA CNn % - GRASS C SOIL GOOD 0.96 74 IMPERVIOUS 0.13 98 BRUSH POOR 0.24 77 ------------------------------------------------------ Overall Approximation 1.33 77 [TIME CONCENTRATION -- USER DEFINED] Time of Concentration....... ...... ..... ... = 30.00 (miry) [RAINFALL DESCRIPTION] Distribution Type........... .............. = SCS III Total Precipitation....................... = 3.10 (in) Return Period....... ........ .............. = 2 (yr) Storm Duration....... ..................... = 24.00 (hr) 11/4/97 Page 1 HYDROGRAPH REPORT RECORD NUMBER 18 TYPE RESER STOR. IND DESCRIPTION SC-1, 2 YR RES. RT. [HYDROGRAPH INFORMATION] Peak Discharge............................ = 0.88 (cfs) Volume.................................... = 0.12 (acft) Time Interval............................. = 5 (min) Time to Peak.............................. = 750.00 (min) Time of Base.............................. = 1600.00 (min) Peak Elevation............. ............... = 253.88 (ft) [RESERVOIR STRUCTURE INFORMATION] Reservoir 4....... ........................ = 1 Description.. ............................. = Exist. Basin Storage type. ........ .................. .. = MAN STAGE/AREA Max storage............................... = 40S6.66 Cuft Discharge type................. ........... = COMP STAGE/DISC Max discharge.............................. = 5.78 cfs [RESERVOIR INFORMATION] Reservoir x............................... = 1 Reservoir Description...................... = Exist. Basin (INFLOW HYDROGRAPH INFORMATION) Hydrograph n.............................. = 17 Hydrograph Description.................... = SC-1, 2 YR 11/4/97 Page 1 HYDROGRAPH REPORT RECORD NUMBER 19 TYPE COMPUTED FLOOD DESCRIPTION SC-2, 2 YR (HYDROGRAPH INFORMATION] Peak Discharge............ ............ .... = 2.75 (cfs) Volume................................. ... = 0.33 (acft) Time Interval........................ ..... = 4 (min) Time to Peak.............. ................ = 740.00 (min) Time of Base................... . .......... = 1476.00 (min) Multiplication factor.... ... ...... . ..... . . = 1.00 [UNIT HYDROGRAPH INFORMATION] Unit hydrograph 4......................... = 2 Unit hydrograph type....... ............... = CURVILINEAR UH Peak Discharge. .. .......... ............... = 5.86 (cfs) Shape Factor................ .............. = 484.00 Time Interval.. .... ....................... = 4 (min) Time to Peak...... .............. .......... = 18.67 (min) Time of Base......... ....... .............. = 93.33 (min) Rainfall Excess............. .............. = 1.00 (in) Basin Lag Time........................ .... = 16.80 (min) [BASIN DESCRIPTION] [WEIGHTED WATERSHED AREA] ------------------------------------------------------ % DESCRIPTION AREA CNn ------------------------------------------------------ BRUSH C SOIL POOR 0.11 77 GRASS C SOIL GOOD 1.03 74 IMPERVIOUS 0.89 98 GRAVEL PARKING AREA 0.38 89 ------------------------------------------------ overall Approximation 2.41 85 [TIME CONCENTRATION -- USER DEFINED] Time of Concentration......... ............ = 28.00 (min) (RAINFALL DESCRIPTION] Distribution Type......................... = SCS III Total Precipitation....................... = 3.10 (in) Return Period.. ............... ........ .... = 2 (yr) Storm Duration. ................ ......... .. = 24.00 (hr) 11/4/97 Page I HYDROGRAPH REPORT RECORD NUMBER 20 TYPE COMBINE DESCRIPTION EXIST. 2 YR FLOW TO STUDY PT. [HYDROGRAPH INFORMATION] Peak Discharge............................ = 3.54 (cfs) Volume.................................... = 0.45 (acft) Time Interval............................. = 2 (min) Time to Peak.. ..................... ..... 740.00 (min) Time of Base.. ............. ............... = 1600.00 (min) [COMBINE HYDROGRAPH RECORD # HYDROGRAPH # is TYPE : RESER STOR. IND DESCRIPTION SC-1, 2 YR RES. RT. Peak Discharge........................ = 0.88 (cfs) Time to Peak...... .................... = 750.00 (min) Time Interval..... ..... ............... = S (min) HYDROGRAPH e 19 TYPE : COMPUTED FLOOD DESCRIPTION SC-2, 2 YR Peak Discharge......................... = 2.75 (cfs) Time to Peak...... .................... = 740.00 (min) Time Interval.......... ............... = 4 (min) 11/4/97 Page 1 HYDROGRAPH REPORT RECORD NUMBER 21 TYPE COMPUTED FLOOD DESCRIPTION SC-3, 2 YR [HYDROGRAPH INFORMATION] Peak Discharge............ ................ = 1.11 (cfs) Volume.................................... = 0.13 (acft) Time Interval......................... .... = 4 (min) Time to Peak................ ............. . = 740.00 (min) Time of Base.. ............................ = 1468.00 (min) Multiplication factor............... ...... 1.00 [UNIT HYDROGRAPH INFORMATION] Unit hydrograph 11.. ....................... = 3 Unit hydrograph type...................... = CURVILINEAR UH Peak Discharge........................ .... = 3.53 (cfs) Shape Factor.......................... .... = 484.00 ' Time Interval............ ..... ........... . = 4 (min) Time to Peak......................... . .... = 17.33 (min) Time of Base.............................. = 96.67 (min) Rainfall Excess......... ............. ..... = 1.00 (in) Basin Lag Time................ ....... ..... = 15.60 (min) [BASIN DESCRIPTION] [WEIGHTED WATERSHED AREA] ------------------------------------------------------ DESCRIPTION AREA CN, ------------------------------------------------------ GRASS GOOD C SOIL 1.12 74 IMPERVIOUS 0.23 98 ------------------------------------------------------ Overall Approximation 1.35 78 [TIME CONCENTRATION -- USER DEFINED] Time of Concentration..................... = 26.00 (min) [RAINFALL DESCRIPTION] Distribution Type... ...................... = SCS III Total Precipitation................... .... = 3.10 (in) Return Period.. ......... .............. . ... = 2 (yr) Storm Duration. .............. .......... ... = 24.00 (hr) 11/4/97 Page 1 HYDROGRAPH REPORT RECORD NUMBER 22 TYPE RESER STOR. IND DESCRIPTION SC-3, 2 YR RES. RT. (HYDROGRAPH INFORMATION) Peak Discharge............................ = 0.71 (cfs) Volume........ ............................ = 0.13 (acft) Time Interval........................... .. = 4 (min) Time to Peak.......................... .... = 760-00 (min) Time of Base.. ............................ = 1468.00 (min) Peak Elevation............ ................ = 257.36 (ft) [RESERVOIR STRUCTURE INFORMATION) Reservoir #.................. ............. = 2 Description.. ............................. = Prop. basin Storage type.............................. = MAN STAGE/AREA Max storage............................... = 5544.00 Cuft Discharge type.... ........................ = COMP STAGE/DISC Max discharge............................. = 1.48 cfs [RESERVOIR INFORMATION] Reservoir4.............. .... ............. = 2 Reservoir Description................. .... = Prop, basin (INFLOW HYDROGRAPH INFORMATION) Hydrograph „.............................. = 21 Hydrograph Description......... ........... = SC-3, 2 YR 11/4/97 Page 1 HYDROGRAPH REPORT RECORD NUMBER 23 TYPE COMPUTED FLOOD DESCRIPTION SC-4, 2 YR [HYDROGRAPH INFORMATION] Peak Discharge............................ = 2.82 (cfs) Volume....... ............................. = 0.34 (acft) TimeInterval........... ..... .—......... = 4 (min) Time to Peak.............................. = 740.00 (min) Time of Base.............................. = 1476,00 (min) Multiplication factor..................... = 1.00 [UNIT HYDROGRAPH INFORMATION] Unit hydrograph 4........... ..... ...... ... = 4 Unit hydrograph type........ ...—..... ... = CURVILINEAR UH Peak Discharge.................... ..... ... = 5.49 (cfs) Shape Factor...................... ........ = 494,00 Time Interval............................. = 4 (min) Time to Peak............................... = 18.67 (min) Time of Base.............................. = 93.33 (min) RainfallExcess........................... = 1.00 (in) Basin Lag Time............................ = 16.80 (min) [BASIN DESCRIPTION] [WEIGHTED WATERSHED AREA] ------------------------------------------------------ DESCRIPTION AREA CN4 - ----------------------------------------------------- GRASS C SOIL GOOD 1.03 74 IMPERVIOUS 1.23 98 ------------------------------------------------------ overall Approximation 2.26 87 [TIME CONCENTRATION -- USER DEFINED] Time of Concentration...... ....... ........ = 28.00 (min) (RAINFALL DESCRIPTION] Distribution Type......................... = SCS III Total Precipitation.. .................. ... = 3.10 (in) Return Period................. ............ = 2 (yr) Storm Duration........ ............ ........ = 24.00 (hr) 11/5/97 Page 1 HYDROGRAPH REPORT RECORD NUMBER 24 TYPE COMBINE DESCRIPTION PROP. 2 YR FLOW TO STUDY PT. [HYDROGRAPH INFORMATION] Peak Discharge...... ... ................ ... = 3.47 (cfs) Volume... ... . .... ............ ..... ........ = 0.47 (acft) Time Interval............................ . = 2 (min) Time to Peak............ .... .............. = 740.00 (min) Time of Base...... .......... . ........... .. = 1476.00 (min) [COMBINE HYDROGRAPH RECORD #] HYDROGRAPH # 22 TYPE : RESER STOR. IND DESCRIPTION SC-3, 2 YR RES. RT. Peak Discharge........................ = 0.72 (cfs) Time to Peak. .................... ..... = 756.00 (min) Time Interval......................... = 4 (min) HYDROGRAPH # 23 TYPE : COMPUTED FLOOD DESCRIPTION : SC-4, 2 YR Peak Discharge....... ............ . .... = 2.82 (cfs) Time to Peak.......................... = 740.00 (min) Time Inter-Val................. ........ = 4 (min) 10-YEAR STORM EVENT 11/4/97 Page 1 HYDROGRAPH REPORT RECORD NUMBER 1 TYPE COMPUTED FLOOD DESCRIPTION SC-1, 10 YR [HYDROGRAPH INFORMATION] Peak Discharge............................ = 2.00 (cfs) Volume.................................... = 0.25 (acft) Time Interval............................. = 5 (min) Time to Peak.............................. = 740.00 (min) Time of Base................. .. .......— - 1480.00 (min) Multiplication factor..................... = 1.00 [UNIT HYDROGRAPH INFORMATION] Unit hydrograph 4....... .............. I Unit hydrograph type...................... = CURVILINEAR UH Peak Discharge.. .................... ...... = 3.02 (cfs) Shape Factor............... ............... = 484.00 Time Interval............;................ S (min) Time to Peak.............................. = 20.00 (min) Time of Base.............................. = 100.00 (min) Rainfall Excess........................... = 1.00 (in) Basin Lag Time............................ = 18.00 (min) (BASIN DESCRIPTION) [WEIGHTED WATERSHED AREA] ------------------------------------------------------ DESCRIPTION AREA CN,' ------------------------------------------------------ GRASS C SOIL GOOD 0.96 74 IMPERVIOUS 0.13 98 BRUSH POOR 0.24 77 ------------------------------------------------------ Overall Approximation 1.33 77 [TIME CONCENTRATION -- USER DEFINED] Time of Concentration..................... = 30.00 (min) (RAINFALL DESCRIPTION] Distribution Type........... .............. = SCS III Total Precipitation....................... = 4.60 (in) Return Period............................ . = 10 (yr) Storm Duration............................ = 24.00 (hr) 11/4/97 Page 1 HYDROGRAPH REPORT RECORD NUMBER 2 TYPE RESER STOR. IND DESCRIPTION SC-1, 10 YR RES. RT. [HYDROGRAPH INFORMATION] Peak Discharge............................ = 1.29 (cfs) Volume.................................. .. = 0.25 (acft) Time Interval............................. = 5 (min) Time to Peak......................... ..... = 760.00 (min) Time of Base.............................. = 1610.00 (min) Peak Elevation............................ = 254.88 (ft) [RESERVOIR STRUCTURE INFORMATION] Reservoir 4............................... = I Description............................... = Exist. Basin Storage type.............................. = MAN STAGE/AREA Max storage............................... = 4056.66 Cuft Discharge type............................ = COMP STAGE/DISC Max discharge..... ......................... = 5.79 cfs [RESERVOIR INFORMATION] Reservoir "............................... = 1 Reservoir Description..................... = Exist. Basin (INFLOW HYDROGRAPH INFORMATION) Hydrograph14.............................. = I Hydrograph Description.................... = SC-1, 10 YR 11/4/97 Page 1 HYDROGRAPH REPORT RECORD NUMBER 3 TYPE COMPUTED FLOOD DESCRIPTION SC-2, 10 YR (HYDROGRAPH INFORMATION) Peak Discharge............................ = 4.92 (cfs) Volume............. ....................... = 0.60 (acft) Time Interval............................. = 4 (min) Time to Peak.. ........... ................. = 740.00 (min) Time of Base.............................. = 1484.00 (min) Multiplication factor.. ................... = 1.00 [UNIT HYDROGRAPH INFORMATION] Unit hydrograph 4......................... = 2 Unit hydrograph type...................... = CURVILINEAR UH Peak Discharge......... ................... = 5.86 (cfs) Shape Factor........................... ... = 484.00 Time Interval............ ................. = 4 (min) Time to Peak.....................I........ = 18.67 (min) Time of Base.............................. = 93.33 (min) Rainfall Excess........................... = 1.00 (in) Basin Lag Time........ .................... = 16.80 (min) [BASIN DESCRIPTION] [WEIGHTED WATERSHED AREA) ------------------------------------------------------ DESCRIPTION AREA 'CN# ------------------------------------------------------ BRUSH C SOIL POOR 0.11 77 GRASS C SOIL GOOD 1.03 74 IMPERVIOUS 0.89 98 GRAVEL PARKING AREA 0.38 89 ------------------------------------------------------ overall Approximation 2.41 85 [TIME CONCENTRATION -- USER DEFINED] Time of Concentration..................... = 29.00 (min) (RAINFALL DESCRIPTION) Distribution Type............. ........... = SCS III Total Precipitation.... ............... .... = 4.60 (in) Return Period............................. = 10 (yr) Storm Duration........... ................. = 24.00 (hr) 11/4/97 Page 1 HYDROGRAPH REPORT RECORD NUMBER 4 TYPE COMBINE DESCRIPTION EXIST. 10 YR FLOW TO STUDY PT. [HYDROGRAPH INFORMATION] Peak Discharge............................ = 6.03 (cfs) Volume............... ..................... = 0.85 (acft) Time Interval............................. = 2 (min) Time to Peak........................ ...... = 740.00 (min) Time of Base.............................. = I610.00 (min) [COMBINE HYDROGRAPH RECORD HYDROGRAPH n 2 TYPE : RESER STOR. IND DESCRIPTION SC-1, 10 YR RES. RT. Peak Discharge.... .................... = 1.29 (cfs) Time to Peak................ .......... = 760.00 (min) TimeInterval......................... = S (min) HYDROGRAPH # 3 TYPE : COMPUTED FLOOD DESCRIPTION SC-2, 10 YR Peak Discharge......................... = 4.92 (cfs) Time to Peak.......................... = 740.00 (min) Time Interval......................... = 4 (min) 11/4/97 Page 1 HYDROGRAPH REPORT RECORD NUMBER 5 TYPE COMPUTED FLOOD DESCRIPTION SC-3, 10 YR [HYDROGRAPH INFORMATION] Peak Discharge................. ........... = 2.25 (cfs) Volume........ ...................... ...... = 0.26 (acft) Time Interval............................. = 4 (min) Time to Peak.............................. = 740.00 (min) Time of Base........................ ..... . = 1472.00 (min) Multiplication factor.......... ........... = 1.00 [UNIT HYDROGRAPH INFORMATION] Unit hydrograph n................... ...... = 3 Unit hydrograph type...................... = CURVILINEAR UH Peak Discharge............................ _ ' 3.53 (cfs) Shape Factor.............................. = 484.00 Time Interval........................ ...... = 4 (min) Time to Peak................ .............. = 17.33 (min) Time of Base.............................. = 86.67 (min) Rainfall Excess........................... = 1.00 (in) Basin Lag Time............................ _ 15.60 (min) [BASIN DESCRIPTION] [WEIGHTED WATERSHED AREA] - ----------------------------------------------- DESCRIPTION AREA CN# ------------------------------------------------------ GRASS GOOD C SOIL 1.12 74 IMPERVIOUS 0.23 98 ------------------------------------------------------ overall Approximation 1.35 78 [TIME CONCENTRATION -- USER DEFINED] Time of Concentration.................. ... = 26.00 (min) (RAINFALL DESCRIPTION] Distribution Type......................... = SCS III Total Precipitation....................... = 4.60 (in) Return Period............................. = 10 (yr) Storm Duration............................ = 24.00 (hr) 11/5/97 Page 1 HYDROGPAPH REPORT RECORD NUMBER 6 TYPE RESER STOR. IND DESCRIPTION SC-3, 10 YR RES. RT. [HYDROGPAPH INFORMATION] Peak Discharge. . ...................... . ... = 0.92 (cfs) Volume.............. .. ..... ............... = 0.26 (acft) Time Interval. ............................ = 4 (min) Time to Peak... .. .................. ....... = 768.00 (min) Time of Base. ....................... ..... . = 1472.00 (min) Peak Elevation................. ...... .... = 258.10 (ft) [INFLOW HYDROGPAPH INFORMATION] Hydrograph #................ ....... . . ..... = S Hydrograph Description.................... = SC-3, 10 YR 11/4/97 Page 1 HYDROGRAPH REPORT RECORD NUMBER 7 TYPE COMPUTED FLOOD DESCRIPTION SC-4, 10 YR [HYDROGRAPH INFORMATION] Peak Discharge............................ = 4.87 (cfs) Volume...... .............................. = 0.60 (acft) Time Interval......................... .... = 4 (min) Time to Peak.. ............................ = 740.00 (min) Time of Base.............................. = 1484.00 (min) Multiplication factor..................... = 1.00 [UNIT HYDROGRAPH INFORMATION] Unit hydrograph #......................... = 4 Unit hydrograph type...................... = CURVILINEAR UH Peak Discharge............................ = 5.49 (cfs) Shape Factor.............................. = 484.00 Time Interval...................... ....... = 4 (min) Time to Peak...... ......... .... .......... = 18.67 (min) Time of Base.............................. 93.33 (min) Rainfall Excess... ........................ = 1.00 (in) Basin Lag Time............................ = 16.80 (min) [BASIN DESCRIPTION] [WEIGHTED WATERSHED AREA] ------------------------------------------------------ DESCRIPTION AREA CN# ------------------------------------------------------ GRASS C SOIL GOOD 1.03 74 IMPERVIOUS 1.23 98 ------------------------------------------------------ Overall Approximation 2.26 87 [TIME CONCENTRATION -- USER DEFINED] Time of Concentration..................... = 28.00 (min) [RAINFALL DESCRIPTION] Distribution Type......................... = SCS III Total Precipitation....................... = 4.60 (in) Return Period............................. = 10 (yr) Storm Duration............................ = 24.00 (hr) 11/5/97 Page 1 HYDROGRAPH REPORT RECORD NUMBER 8 TYPE COMBINE DESCRIPTION PROP. 10 YR FLOW TO STUDY PT. [HYDROGRAPH INFORMATION] Peak Discharge............................ = 5.70 (cfs) Volume....... ................. .... ........ = 0.86 (acft) Time Interval. .......... .................. = 2 (min) Time to Peak... . ................. . .... .. .. = 740.00 (min) Time of Base. ..... ... ..................... = 1484.00 (min) [COMBINE HYDROGRAPH RECORD #] HYDROGRAPH # 6 TYPE ; RESER STOR. IND DESCRIPTION SC-3, 10 YR RES. RT. Peak Discharge... ............... . ..... = 0.92 (cfs) Time to Peak.. ... . ... .............. ... = 769.00 (min) Time Interval............. . ........ ... = 4 (min) HYDROGRAPH # 7 TYPE : COMPUTED FLOOD DESCRIPTION SC-4, 10 YR Peak Discharge.. . ............... . ..... = 4.87 (cfs) Time to Peak. . . . . .... ............... .. = 740.00 (min) Time Interval.... ..... ... ............ = 4 (min) i 11/4/97 Page 1 HYDROGRAPH REPORT - RECORD NUMBER 9 TYPE COMPUTED FLOOD DESCRIPTION SC-1, 100 YR [HYDROGRAPH INFORMATION] Peak Discharge............................ = 3.45 (cfs) Volume... .................. .......... ..... = 0.43 (acft) Time Interval...... ....................... = S (min) Time to Peak................. ...... ....... = 740.00 (min) Time of Base.............................. = 1485.00 (min) Multiplication factor................ ..... = 1.00 [UNIT HYDROGRAPH INFORMATION] Unit hydrograph 4......... .......... ...... = 1 Unit hydrograph type...................... = CURVILINEAR UH Peak Discharge............................ = 3.02 (cfs) Shape Factor.............................. = 484.00 Time Interval................. ............ = S (min) Time to Peak............................... = 20.00 (min) Time of Base.............................. = 100.00 (min) Rainfall Excess.......................... . = 1.00 (in) Basin Lag Time............................ = 18.00 (min) [BASIN DESCRIPTION] [WEIGHTED WATERSHED AREA] -----------------------------— DESCRIPTION AREA CNn ; ------------------------------------------------------ GRASS C SOIL GOOD 0.96 74 IMPERVIOUS 0.13 98 BRUSH POOR 0.24 77 ------------------------------------------------------ Overall Approximation 1.33 77 [TIME CONCENTRATION -- USER DEFINED] Time of Concentration.................... . = 30.00 (min) i [RAINFALL DESCRIPTION] Distribution Type......................... = SCS III Total Precipitation....... .... ............ = 6.50 (in) Return Period............................. = 100 (yr) Storm Duration............................ = 24.00 (hr) 11/4/97 Page 1 HYDROGRAPH REPORT RECORD NUMBER 10 TYPE RESER STOR. IND DESCRIPTION SC-1, 100 YR RES. RT. (HYDROGRAPH INFORMATION] Peak Discharge................. ........... = 2.31 (cfs) Volume.......... .......................... = 0.43 (acft) Time Interval... .......................... = 5 (min) Time to Peak.............................. = 760.00 (min) Time of Base.............................. = 1620.00 (min) Peak Elevation............................ = 256.14 (ft) [RESERVOIR STRUCTURE INFORMATION] Reservoir .............................. = 1 Description............................... = Exist. Basin Storage type.............................. = MAN STAGE/AREA Max storage............................... = 4056.66 Cuft Discharge type............................ = COMP STAGE/DISC Max discharge............................. = 5.78 cfs [RESERVOIR INFORMATION] Reservoir #............................... = 1 Reservoir Description................... .. = Exist. Basin [INFLOW HYDROGRAPH INFORMATION] Hydrograph #.............................. _ 9 Hydrograph Description.................... SC-1, 100 YR 11/4/97 Page 1 HYDROGRAPH REPORT RECORD NUMBER 11 TYPE COMPUTED FLOOD DESCRIPTION SC-2, 100 YR [HYDROGRAPH INFORMATION] Peak Discharge............................ = 7.56 (cfs) Volume.................................... = 0.94 (acft) Time Interval. ...... ...................... = 4 (min) Time to Peak.. .. .......................... = 740.00 (min) Time of Base.. .................. .......... = 1488.00 (min) Multiplication factor..................... = 1.00 [UNIT HYDROGRAPH INFORMATION] Unit hydrograph n......................... = 2 Unit hydrograph type...................... = CURVILINEAR UH Peak Discharge............................ = 5.86 (cfs) Shape Factor........ ....... .............. = 484.00 Time Interval. ............................ = 4 (min) Time to Peak.. ............................ = 18.67 (min) Time of Base.............................. = 93.33 (min) Rainfall Excess........................... = 1.00 (in) Basin Lag Time............................ = 16.80 (min) [BASIN DESCRIPTION] [WEIGHTED WATERSHED AREA] -------------—--------------------------------------- DESCRIPTION AREA CNn ------------------------------------------------------ BRUSH C SOIL POOR 0.11 77 GRASS C SOIL GOOD 1.03 74 IMPERVIOUS 0.89 98 GRAVEL PARKING AREA 0.38 89 ------------------------------------------------------ overall Approximation 2.41 SS [TIME CONCENTRATION -- USER DEFINED] Time of Concentration..................... = 28.00 (min) [RAINFALL DESCRIPTION] Distribution Type......................... = SCS III Total Precipitation....................... = 6.40 (in) Return Period............................. = 100 (yr) Storm Duration............................ = 24.00 (hr) 11/4/97 Page 1 HYDROGRAPH REPORT RECORD NUMBER 12 TYPE COMBINE DESCRIPTION EXIST. 100 YR FLOW TO STUDY PT. [HYDROGRAPH INFORMATION) i Peak Discharge............................ = 9.00 (cfs) Volume..................... ... ............ = 1.37 (acft) Time Interval....... ... ................... = 2 (min) Time to Peak.... .:........................ _ 740.00 (min) Time of Base.............................. = 1620.00 (min) [COMBINE HYDROGRAPH RECORD 4] HYDROGRAPH #{` 10 TYPE : RESER STOR. IND DESCRIPTION SC-1, 100 YR RES. RT. Peak Discharge......... ............... _ 2.31 (cfs) Time to Peak.......................... = 760.00 (min) Time Interval......... ................ = 5 (min) HYDROGRAPH n 11 TYPE : COMPUTED FLOOD DESCRIPTION SC-2, 100 YR Peak Discharge........................ = 7.56 (cfs) Time to Peak.......................... _ �740.00 (min) Time Interval..... .................... = 4 (min) 11/4/97 Page 1 HYDROGRAPH REPORT RECORD NUMBER 13 TYPE COMPUTED FLOOD DESCRIPTION SC-3, 100 YR [HYDROGRAPH INFORMATION) I Peak Discharge..................... ....... = 3.72 (cfs) Volume........ ............................ = 0.44 (acft) Time Interval.......... .. ................. = 4 (min) Time to Peak. ............ ................. _ 736.00 (min) Time of Base.. ............................ = 1476.00 (min) Multiplication factor..................... = 1.00 [UNIT HYDROGRAPH INFORMATION] unit hydrograph 4......................... = 3 Unit hydrograph type...................... = CURVILINEAR UH Peak Discharge............................ = 3.53 (cfs) Shape Factor.............................. = 484.00 Time Interval............................. = 4 (min) Time to Peak.............................. = 17.33 (min) Time of Base.............................. = 86.67 (min) Rainfall Excess........................ ... = 1.00 (in) Basin Lag Time............................ = 15.60 (min) [BASIN DESCRIPTION) [WEIGHTED WATERSHED AREA] ------------------------------------—---------------- DESCRIPTION AREA CN# ------------------------------------------------------ GRASS GOOD C SOIL 1.12 74 IMPERVIOUS 0.23 98 ------------------------------------------------------ overall Approximation 1.35 78 [TIME CONCENTRATION -- USER DEFINED] Time of Concentration..................... = 26.00 (min) [RAINFALL DESCRIPTION] Distribution Type...................... ... = SCS III Total Precipitation.... ................ ... = 6.40 (in) Return Period............................. = 100 (yr) Storm Duration............................ = 24.00 (hr) 11/5/97 Page I HYDROGRAPH REPORT RECORD NUMBER 14 TYPE RESER STOR. IND DESCRIPTION SC-3, 100 YR RES. RT. [HYDROGRAPH INFORMATION] Peak Discharge.............. .............. = 1.39 (cfs) volume........ ........ ............ ........ = 0.44 (acft) Time Interval............................ . = 4 (min) Time to Peak. ..... ....... ................. = 768.00 (min) Time of Base....... .................... ... = 1476.00 (min) Peak Elevation........... ................ . = 258.87 (ft) [INFLOW HYDROGRAPH INFORMATION] Hydrograph #. ... .... . ................. .... = 13 Hydrograph Description.. ................ .. = SC-3, 100 YR 11/5/97 Page 1 HYDROGRAPH REPORT RECORD NUMBER IS TYPE COMPUTED FLOOD DESCRIPTION SC-4, 100 YR [HYDROGRAPH INFORMATION] Peak Discharge............................ = 7.35 (cfs) Volume........ ............................ = 0.92 (acft) Time Interval. .. .... ............... . . ..... = 4 (min) Time to Peak.......... .................... = 740.00 (min) Time of Base.. ...... ..... ................. = 1488.00 (min) Multiplication factor......... ....... ..... = 1.00 [UNIT HYDROGRAPH INFORMATION] Unit hydrograph #............. ............ = 4 Unit hydrograph type.. .................... = CURVILINEAR UH Peak Discharge.......... .................. = 5.49 (cfs) Shape Factor.. ...... ....... ...... .. ....... = 484.00 Time Interval. ............................ = 4 (min) Time to Peak.. ..... ....... ................ = 18.67 (min) Time of Base. ... .... ........... ...... ..... = 93.33 (min) Rainfall Excess....... .................... = 1.00 (in) Basin Lag Time............................ = 16.80 (min) [BASIN DESCRIPTION] [WEIGHTED WATERSHED AREA] ------------------------------------------------------ DESCRIPTION AREA CN# ------------------------------------------------------ GRASS C SOIL GOOD 1.03 74 IMPERVIOUS 1.23 98 ------------------------------------------------------ overall Approximation 2.26 87 [TIME CONCENTRATION -- USER DEFINED] Time of Concentration... . ................. = 28.00 (min) [RAINFALL DESCRIPTION] Distribution Type..... .................... = SCS III Total Precipitation... . . .................. = 6.40 (in) Return Period. ......... ................... = 100 (yr) Storm Duration......... . . . ............. ... = 24.00 (hr) 11/5/97 Page 1 HYDROGRAPH REPORT RECORD NUMBER 16 TYPE COMBINE DESCRIPTION PROP. 100 YR, FLOW TO STUDY PT. [HYDROGRAPH INFORMATION] Peak Discharge.................. ...... . ... = 8.31 (cfs) Volume.......... ............ .............. = 1.36 (acft) Time Interval................. ...... ...... = 2 (min) Time to Peak... ........................... = 740.00 (min) Time of Base.... ........ .... .............. = 1488.00 (min) [COMBINE HYDROGRAPH RECORD 4] HYDROGRAPH # 14 TYPE : RESER STOR. IND DESCRIPTION SC-3, 100 YR RES. RT. Peak Discharge..... . .................. = 1.39 (cfs) Time to Peak........ ..... . ...... ..... . = 768.00 (min) Time Interval..................... .... = 4 (min) HYDROGRAPH # is TYPE : COMPUTED FLOOD DESCRIPTION SC-4, 100 YR Peak Discharge...............—....... = 7.25 (cfs) Time to Peak................. ..... .... = 740.00 (min) Time Interval..... ........ ......... ... = 4 (min) DETENTION 0.J 11/4/97 Page 1 RESERVOIR REPORT RECORD NUMBER 1 STORAGE TYPE MAN STAGE/AREA DISCHARGE TYPE COMP STAGE/DISC DESCRIPTION Exist. Basin [RATING CURVE LIMIT) Minimum Elevation......................... = 252.77 (ft) Maximum Elevation......................... = 256.50 (ft) Elevation Increment....................... = 0.10 (ft) [STAGE STORAGE INFORMATION] Input file = NULL Output file = NULL [Manual Contour Area vs. Elevation] ------------------------------------------------ ELEVATION CONTOUR AREA (ft) (sqft) ------------------------------------------------ 254.00 1016.00 256.00 1644.00 256.50 1644.00 (STAGE DISCHARGE INFORMATION) OUTLET STRUCTURE: STR n 1 TYPE STAND PIPE WEIR DESCRIPTION Exist. outlet 11/5/97 Page 1 RESERVOIR REPORT RECORD NUMBER 2 STORAGE TYPE MAN STAGE/AREA DISCHARGE TYPE COMP STAGE/DISC DESCRIPTION Prop. basin [RATING CURVE LIMIT] Minimum Elevation.................. . ...... = 254.50 (ft) Maximum Elevation....... .. ............ ... . = 259.00 (ft) Elevation Increment....................... = 0.10 (ft) [STAGE STORAGE INFORMATION] Input file = NULL output file = NULL [Manual Contour Area vs. Elevation] ------------------------------------------------ ELEVATION CONTOUR AREA (ft) (sgft) ------------------------------------------------ 257.00 600.00 258.00 3300.00 259.00 4100.00 [STAGE DISCHARGE INFORMATION] OUTLET STRUCTURE: SIR # 2 TYPE STAND PIPE WEIR DESCRIPTION Prop. outlet I 11/4/97 Page I OUTLET STRUCTURE REPORT RECORD NUMBER I TYPE STAND PIPE WEIR DESCRIPTION Exist. outlet [RATING CURVE LIMIT) Minimum Elevation.......... ............... = 252.77 (ft) Maximum Elevation.. ......... .. ............ = 256.50 (ft) Elevation Increment. .............. ...... .. = 0.10 (ft) [STANDPIPE INFORMATION] DESCRIPTION : RECTANGULAR STAND PIPE [OUTLET STRUCTURE INFORMATION] Width...................... ............... = 2.00 (ft) Height........ ..... .... . .... .. .... ........ = 2.00 (ft) Crest Length................ ...... ........ = 2.00 (ft) Crest Elevation.............. ............. = 255.93 (ft) Fraction Open Area........................ = 1.00000 [RECTANGULAR STAND PIPE EQUATION] ORIFICE EQ: Q = Co*A(2gh)-0.5 WEIR EQ: Q = Cw*L*H-exp Coefficient Co ........................... = 0.60000 Coefficient Cw ........... ................ = 3.33000 Exponential... ......................... ... = 1.50000 [DEFINITIONS) H = Headwater depth above inlet control section invert, (ft) A = Wetted area, (sqft) L = Crest length, (ft) [ORIFICE INFORMATION) SUBRECORD I DESCRIPTION CIRCULAR ORIFICE [OUTLET STRUCTURE INFORMATION] Radius.............. ....... .......... ..... = 0.25000 Invert Elevation.............. ............ = 252.77000 (ft) Coefficient Cc......... ................... = 0.60000 # of openings.......... ................... = 1 [CIRCULAR ORIFICE EQUATION] Q = CO*A*(2gh)/kl-0.5 A = Wetted area, (sqft) 11/4/97 Page 2 OUTLET STRUCTURE REPORT RECORD NUMBER 1 TYPE STAND PIPE WEIR DESCRIPTION Exist. outlet [CULVERT INFORMATION] DESCRIPTION : CIRCULAR CONCRETE/sq edge/headwall [OUTLET STRUCTURE INFORMATION) Circular Radius..................... ... ... = 0.50000 (ft) Culvert Invert Elevation.................. = 253.32001 (ft) Slope..................................... = 0.03200 Manning's N-value......................... = 0.01300 Orifice Coefficient........ ............... = 0.50000 Tailwater................................. = 0.00000 (ft) Numberbarrels......................... ... = 1 [UNSUBMERGED EQUATION) H/Diam = Hc/Diam + K *(Q/A*Diam-0.5))-M - 0.5*S-2 Coefficient K............................. = 0.00980 coefficient M........................ 2.00000 [SUBMERGED EQUATION] H/Diam = c*(Q/(A*Diam-O.S))-Z + Y - 0.5*S-2 Coefficient c.......................... ... = 0.03980 Coefficient Y....7................I........ = 0.67000 [DEFINITIONS] H = Headwater depth above inlet control section invert, (ft) Diam = Inerior height of culvert barrel, (ft) He = Specific head at critical depth (dc + Vc-2/2g), (ft) Q = Discharge, (cuft/s) A = Full cross sectional area of culvert barrel, (sqft) S = Culvert barrel slope, (ft/ft) 11/5/97 Page I OUTLET STRUCTURE REPORT RECORD NUMBER 2 TYPE STAND PIPE WEIR DESCRIPTION Prop. outlet [RATING CURVE LIMIT] Minimum Elevation............. ... ....... .. = 254.50 (ft) Maximum Elevation....... . . . ............... = 259.00 (ft) Elevation Increment....... ... .......... ... = 0.10 (ft) [STANDPIPE INFORMATION] DESCRIPTION : RECTANGULAR STAND PIPE [OUTLET STRUCTURE INFORMATION] Width.. .. . . .. ............. ............. ... = 2.00 (ft) Height....... . ......... ................ . .. = 2.00 (ft) Crest Length. . . .............. . . . ........ .. = 2.00 (ft) Crest Elevation................... ... ..... = 258.75 (ft) Fraction Open Area........................ = 1.00000 [RECTANGULAR STAND PIPE EQUATION] ORIFICE EQ: Q = Co*A(2gh)^0.5 WEIR EQ: Q = Cw*L*H^exp Coefficient Co . ............ .... ....... ... = 0.60000 Coefficient Cw ................. ..... . . ... = 3.33000 Exponential.. ... ... .. . . ................... = 1.50000 [DEFINITIONS] H = Headwater depth above inlet control section invert, (ft) A = Wetted area, (sqft) L = Crest length, (ft) [ORIFICE INFORMATION] SUBRECORD 1 DESCRIPTION CIRCULAR ORIFICE [OUTLET STRUCTURE INFORMATION] Radius.. . ................. ........... .... . = 0.21000 Invert Elevation............ .... ......... . = 256.00000 (ft) Coefficient Cc.................. .......... = 0.60000 # of openings............................. = I [CIRCULAR ORIFICE EQUATION] Q = Co*A*[2gh]/kl'0.5 A = Wetted area, (sqft) 11/5/97 Page 2 OUTLET STRUCTURE REPORT RECORD NUMBER 2 TYPE STAND PIPE WEIR DESCRIPTION Prop. outlet [CULVERT INFORMATION] DESCRIPTION : CIRCULAR CONCRETE/sq edge/headwall [OUTLET STRUCTURE INFORMATION] Circular Radius... . ............ .. ......... = G.S0000 (ft) Culvert Invert Elevation................. . = 2SS.00000 (ft) Slope......... .... .......... . ........ ..... = 0.02800 Manning's N-value....................... .. = 0,01300 Orifice Coefficient....................... = O.S0000 Tailwater................. ....... ......... = 2SS.63000 (ft) Number barrels.... ............... ......... = I [UNSUBMERGED EQUATION] H/Diam = Hc/Diam + K *(Q/A*Diam^0.5))'M - 0.5*S^2 Coefficient K.................... ......... = 0.00980 coefficient M................ .... ......... = 2.00000 [SUBMERGED EQUATION] H/Diam = c*(Q/(A*Diam^0.5))^Z + Y - O.S*S'2 Coefficient c............... ..... ...... ... = 0.03980 Coefficient Y. ............................ = 0.67000 [DEFINITIONS] H = Headwater depth above inlet control section invert, (ft) Diam = Inerior height of culvert barrel, (ft) He = Specific head at critical depth (dc + Vc^2/2g), (ft) Q = Discharge, (cuft/s) A = Full cross sectional area of culvert barrel, (sqft) S = Culvert barrel slope, (ft/ft) TPUE F CONCENTRATION CALCULATIONS 1 11/03/97 Time of Concentration TRSS SHEET FLOW Manning' s n: 0 . 2400 Flow Length: 100 . 0000 ft 2yr/24 hr Rainfall : 3 . 1000 in Land Slope : 1 . 0000 0 Travel Time : 19 . 1310 min SHALLOW FLOW K(Land use/Flow Regime) : 0 .2500 Watercourse Slope : 1 . 0000 0 Flow Length: 150 . 0000, ft Velocity: 0 . 2500 ft/s Travel Time : 10 . 0000 min CHANNEL FLOW Hydraulic Radius : 0 . 0000 ft Channel Slope : 0 . 0000 0 - Manning' s n: 0 . 2400 Flow Length: 0 . 0000 ft Velocity: 0 . 0000 ft/s Travel Time : 0 . 0000 min Time of Concentration: 29 . 1310 min � I HHCalc, Version 7 . Os Eagle Point, 4131 WestMark Drive, Dubuque, IA, 52002 , 1-800-678-6565 11/03/97 Time of Concentration TR55 SHEET FLOW Manning' s n: 0 . 0000 Flow Length: 0 . 0000 ft 2yr/24 hr Rainfall : 0 . 0000 in Land Slope : 0 . 0000 0 Travel Time : 0 . 0000 min SHALLOW FLOW K(Land use/Flow Regime) : 1 .5000' Watercourse Slope : 4 . 0000 0 Flow Length: 135 . 0000 ft Velocity: 3 . 0000 ft/s Travel Time : 0 . 7500 min CHANNEL FLOW Hydraulic Radius : 0 . 0000 ft Channel Slope: 0 . 0000 - o Manning' s n: 0 . 0000 Flow Length: 0 . 0000 ft Velocity: 0 . 0000 ft/s Travel Time : 0 . 0000 min Time of Concentration: 0 . 7500 min i HHCalc, Version 7 . Os Eagle Point, 4131 WestMark Drive, Dubuque, IA, 52002 , 1-800-678-6565 10/28/97 Time of Concentration TR55 SHEET FLOW j Manning' s n: 0 . 2400 Flow Length: 100 . 0000 ft 2yr/24 hr Rainfall : 3 . 1000 in Land Slope : 1 . 0000 0 Travel Time : 19 .1310 min SHALLOW FLOW K(Land use/Flow Regime) : 0 . 2500, Watercourse Slope : 1 . 0000 a Flow Length: 115 . 0000 ft Velocity: 0 . 2500 ft/s Travel Time : 7 . 6667 min CHANNEL FLOW Hydraulic Radius : 0 . 0000 ft ; Channel Slope: 0 . 0000 0 Manning' s n: 0 . 2400 Flow Length: 0 . 0000 ft Velocity: 0 . 0000 ft/s Travel Time : 0 . 0000 min Time of Concentration: 26 . 7977 min HHCalc, Version 7 . Os Eagle Point, 4131 WestMark Drive, Dubuque, /IA, 52002 , 1-800-678-6565 10/28/97 Time of Concentration TR55 SHEET FLOW Manning' s n: 0 . 0000 Flow Length: 0 . 0000 ft 2yr/24 hr Rainfall : 0 . 0000 in Land Slope : 0 . 0000 0 Travel Time : O : 0000 min SHALLOW FLOW K(Land use/Flow Regime) : 2 . 0000 Watercourse Slope : 1 . 0000 0 Flow Length: 80 . 0000 ft Velocity: 2 . 0000 ft/s Travel Tivoe 0 . 6667 min CHANNEL FLOW Hydraulic Radius : 0 . 0000 ft Channel Slope : 0 . 0000 a Manning' s n: 0 . 0000 Flow Length: 0 . 0000 ft Velocity: 0 . 0000 ft/s Travel Time : 0 . 0000 min Time of Concentration: 0 . 6667 min HHCalc, Version 7 . Os Eagle Point, 4131 WestMark Drive, Dubuque, IA, 52002 , 1-800-678-6565 i 11/03/97 Time of Concentration TR55 SHEET FLOW Manning' s n: 0 . 2400 Flow Length: 100 . 0000 ft 2yr/24 hr Rainfall : 3 . 1000 in Land Slope : 1 . 0000 0 Travel Time: 19 . 1310 min SHALLOW FLOW K (Land use/Flow Regime) : 0 . 2500 Watercourse Slope : 1 . 0000 0 Flow Length: 80 . 0000 ft Velocity: 0 .2500 ft/s Travel Time : 5 . 3333 min CHANNEL FLOW Hydraulic, Radius : 0 . 0000 ft Channel Slope : 0 . 0000 0 Manning' s n: 0 . 2400 Flow Length: 0 . 0000 ft Velocity: 0 . 0000 ft/s Travel Time : 0 . 0000 min Time of Concentration: 24 .4643 min 1 � HHCalc, Version 7 . Os Eagle Point, 4131 WestMark Drive, Dubuque, IA, 52002 , 1-800-678-6565 Cp � � 11/04/97 Time of Concentration TR55 SHEET FLOW Manning' s n: 0 . 0000 Flow Length: 0 . 0000 ft 2yr/24 hr Rainfall : 0 . 0000 in Land Slope : 0 . 0000 0 Travel Time : 0 . 0000 min SHALLOW FLOW K (Land use/Flow Regime) : 1 .5000 Watercourse Slope : 2 . 2000 0 Flow Length: 200 . 0000 •ft Velocity: 2 . 2249 ft/s Travel Time: 1 . 4982 min CHANNEL FLOW Hydraulic Radius : 0 . 0000 ft Channel Slope : 0 . 0000 0 - Manning' s n: 0 . 0000 Flow Length: 0 . 0000 ft Velocity: 0 . 0000 ft/s Travel Time : 0 . 0000 min Time of Concentration: 1 .4982 min 1 +. HHCalc, Version 7 . Os Eagle Point, 4131 WestMark Drive, Dubuque, IA, 52002 , 1-800-678-6565 re v 22t 10/28/97 Time of Concentration TR55 SHEET FLOW Manning' s n: 0 . 2400 Flow Length: 100 . 0000 ft 2yr/24 hr Rainfall : 3 . 1000 in Land Slope : 1 . 0000 0 Travel Time : 19 . 1310 min SHALLOW FLOW K(Land use/Flow Regime) : 0 . 2500 Watercourse Slope : 1 . 0000 0 Flow Length: 115 . 0000 ft Velocity: 0 . 2500 ft/s Travel Time : 7 . 6667 min CHANNEL FLOW Hydraulic Radius : 0 . 0000 ft Channel Slope: 0 . 0000 0 Manning' s n: 0 . 2400 Flow Length: 0 . 0000 ft Velocity: 0 . 0000 ft/s Travel Time : 0 . 0000 min Time of Concentration: 26 . 7977 min I 1 HHCalc, Version 7 . Os Eagle Point, 4131 WestMark Drive, Dubuque, IA, 52002, 1-800-678-6565 r. 10/28/97 Time of Concentration TR55 SHEET FLOW Manning' s n: 0 . 0000 Flow Length: 0 . 0000 ft 2yr/24 hr Rainfall : 0 . 0000 in Land Slope : 0 . 0000 0 Travel Time: 0 . 0000 min SHALLOW FLOW K (Land use/Flow Regime) : 2 .'0000 Watercourse Slope : 1 . 0000 0 Flow Length: 80 . 0000 ft Velocity- 2 . 0000 ft/s Travel Time : 0 . 6667 min CHANNEL FLOW Hydraulic Radius : 0 . 0000 ft Channel Slope : 0 . 0000 :o Manning' s n: 0 . 0000 Flow Length: 0 . 0000 ft Velocity: 0 . 0000 ft/s Travel Time : 0 . 0000 min Time of Concentration: 0 . 6667 min i I HHCalc, Version 7 . Os Eagle Point, 4131 WestMark Drive, Dubuque, IA, 52002 , 1-800-678-6565 RAINFALL I-D-F CURVES i IDF CURVES LEGEND 2 year idf curve y ti 10 ear idf curare 100 year idf curve � � 1 r I J _ I W E-- 1 . u 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1A 1.6 1.8 2.0 TIME E z r)