WWHM3 - BE Courses
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1. ASN E EJ es gt ED E LARCH 498 Water amp Soils in the Urban Environment Winter 2011 Rd WWHM3 File Edit View Help c amp E Facility Name Outlet 1 Outlet 2 Outlet 3 Downstream Connections no gm Facility Type Precipitation Applied to Facility Auto Pond Quick Pond Evaporation Applied to Facility Facility Bottom Elevation ft oY Facility Dimensions Outlet Structure Bottom Length ft p Rise Height p Bottom Width ft p 1 xe er fo i 24 Riser Diameterin p o Point Of Compliance Effective Depth ft a sec Left Side Slope HAV p 1 Wer ype Plat i Element Trapezoidal Pond 1 Bottom Side Slope HAV o Notch Type Right Side Slope H fs POC Outlet Select POC _ADD Top Side Slope D v Outlet 1 ESSERE i acili imension Diagram ge y 3 Orifice Diameter Height QMax Infiltration No Number ln Ft cfs 1 o o 0 2 fo o 0 3 o 40 Pond Volume at Riser Head acre ft Move Elements Pond Increment n10 Show Pond Table OpenTable Use Tide Gate No EX sn E Right click on the trapezoidal pond element to connect the pond s outlet to the point of compliance Highlight Connect to Point Of Compliance and click The Point of Compliance screen will be shown for the pond The pond has one outlet by default The outflow from the pond will be compared with the Predeveloped runoff T2. 1oE 4 10E 3 10E 2 10E 1 1 10 100 Percent Time Exceeding REWER REAR oe The WWHM3 first computes the Predeveloped runoff then the flow frequency for the Predeveloped runoff From the flow frequency results half of the 2 year and the 50 year flows are identified This is the range selected for the flow duration analysis Predeveloped flow duration values between half of the 2 year and the 50 year are plotted on the screen in blue 11 LARCH 498 Water amp Soils in the Urban Environment Winter 2011 You can re run analysis by clicking Optimize Pond The WWHM2G computes Mitigated runoff AutoPond selects initial pond and outlet structure dimensions and the Mitigated flow is routed through the pond The outflow from the pond is analyzed and the Mitigated flow duration is plotted on the screen in red AutoPond compares the Mitigated flow duration results with the Predeveloped flow duration values If the Mitigated flow duration values are greater than the Predeveloped values AutoPond increases the size of the pond or alters the outlet structure based on predefined rules and reruns the Mitigated runoff through the revised pond If the Mitigated flow duration values are less than the Predeveloped values AutoPond decreases the size of the pond or alters the outlet structure and reruns the Mitigated runoff through the revised pond Either way AutoPond continues this exercise until the smallest possible pond is designed At that point AutoPond anno
3. 283 Pass 388 244 Pass 341 Pass 307 Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Deco FLOVY cfs de H a aa tty ha S Ns P 0 01 ang 106 5 104 10E3 106 2 1081 1 Percent Time Exceeding Durations Flow Frequency Water Quality Hydrograph Wetland Fluctuation Analyze datasets 501 POC 1 Predeveloped flow 801 POC 1 Mitigated flow Move Elements et Wb fel m m m m mj mi dme my dm iS fel ed te eg mn mp m ex md ied en mg ey en md ey md e m a te lana fe tals te lS a el fe fe 3 te fel fet te fe The flow duration plot for both Predeveloped and Mitigated flows will be shown along with the specific flow values and number of times Predeveloped and Mitigated flows exceeded those flow values The Pass Fail on the right indicates whether or not at that flow level the Ecology flow control standard criteria were met and the pond passes at that flow level from half of the 2 year flow to the 50 year If not a Fail is shown one Fail fails the pond design You can also produce a graph of the Flow Frequency and the Hydrograph Select the Hydrograph tab Under Available Project Data check the three boxes 13 LARCH 498 Water amp Soils in the Urban Environment Winter 2011 VLPrecip precipitation data POC 1 Predeveloped flow flow data for the predeveloped scenario POC 1 Mitigated flo
4. other elements you can use and explore to help mitigate stormwater runoff Please see the User s Manual for more details on each of the elements We suggest that you spend some time exploring each element These include Vault which can be sized to act as a cistern using autovault Tank Irregular Pond Sand filter for water quality Channel Infiltration all elements have a surface discharge by default The user can turn on the infiltration option as seen in the gravel trench bed example by changing the infiltration arrow from NO to YES This activates the infiltration input options Flow splitter Bioretention swale only available with SPU map information no info in the User s Manual Greenroof element only available with SPU map information no info in the User s Manual More information on these LID elements will be provided 18
5. LARCH 498 Water amp Soils in the Urban Environment Winter 2011 Western Washington Continuous Simulation Hydrology Model WWHM3 The WWHM 3 is the third edition of the Western Washington Hydrology Model It was designed by the Washington State Department of Ecology AQUA TERRA Consultants and Clear Creek Solutions Inc the successor to the Washington offices of AQUA TERRA Consultants WWHMs3 allows you to size stormwater control facilities to mitigate the effects of increased runoff from proposed land use changes that impact natural streams wetlands and other water courses It uses Continuous simulation hydrology HSPF from the USGS Actual long term recorded precipitation data Measured pan evaporation data Historic vegetation for predeveloped conditions Regional HSPF parameters WWHMNM3O also has several LID options new from version 2 These are only available when you select SPU in the map information window Installing the Western Washington Hydrology Model version 3 WWHMS3 To download the model and User s Manual from the Department of Ecologywebsite go to http www ecy wa gov programs wq stormwater w whmtraining wwhm wwhm v3 index html Download WWHM0Q3 msi file Please note When downloading this file save it on the desktop or in a folder on your PC other than lt C Program Files WWHM3 gt This is the default folder for the installation step Download allmaps ww msi file Please note When downloadi
6. Name Ballard High Address 1418 NW 65 St City Seattle Leave the default Gage data VLPRECIP 15 Min LARCH 498 Water amp Soils in the Urban Environment Winter 2011 You can also locate the project site on the map using the map controls to magnify a portion of the map and selecting the site with a click of a mouse refer to p 7 of User Manual 2 Usethe tool bar immediately above the map to move to the Scenario Editor Click on the General Project Information Button The Schematic Editor comes up This is where you develop your Predeveloped and Mitigated Scenarios First setup the Predeveloped scenario Check the Predeveloped scenario box Left click on the Basin element under the Elements heading The Basin element is the upper left element Select the top left grid cell and click on that cell The basin will appear in that grid cell The Element can be moved up down left or right using the Move Elements arrow buttons The Basin element represents a drainage area that can have any combination of soils vegetation and land uses read more in User Manual p 28 You specify the land use information associated with the basin the window the right Here you enter the appropriate soil vegetation and land slope for the Predeveloped scenario LARCH 498 Water amp Soils in the Urban Environment Winter 2011 AWHA File Edit View Help Da k amp e Se Subbasin Name Surface Int
7. Slope H Right Side Slope H Top Side Slope H Facility Di ion Di _ Facility Dimension Diagram Gis DiameterHeight Max Infiltration Mo Number In Ft cfs o 4 x uo 2 Outlet Structure Riser Height ft 0 Riser Diameter in f Riser Type Flat 5 Notch Type AH Pond Volume at Riser Head acre ft Move Elements Pond Increment a4 Show Pond Table OpenTable Use Tide Gate Wo LARCH 498 Water amp Soils in the Urban Environment Winter 2011 T Right click on the basin and select Connect To Element Deua ese c rm ACA A green line will appear with one end connected to the basin With the mouse pointer pull the other end of the line down to the trapezoidal pond and click on the pond This will t bring up the From Basin to Conveyance screen As with the Predeveloped scenario we want to only connect the surface flow and the interflow from the basin to the pond Click OK A black line will connect the basin to the pond Ballard Mitigate Element Option List Connect To Element Connect to Point Of Compliance Disconnect Element Disconnect POC eA WWHM3 File Edit View Help Cut Ctrl x E Copy Ctrl C Duk amp E e Paste Ctri V i Delete Ctrl D Duplicate Predeveloped EL Save Element Load Element Run Predeveloped Run Mitigated Clear All Import Basin Location Move Elements ets HM
8. erflow Groundwater Flows To Area in Basin Show Only Selected Available Pervious Available Impervious a AB Forest Flat 0 Sx AB Forest Mod Jo M RoADSMOD Je AB Forest Steep Jo M ROADS STEEP Jo _ AB Pasture Flat 0 ROOFTOPS ALAT 0 A B Paswe Mod Jo DRIVEWAYS FLAT Jo A B Pasture Steep Jo M DRIVEWAYS MOD Jo AB Lawn Flat Jo DRIVEWAYS STEEP Jo M AB Lawn Mod Jo SIDEWALKS FLAT Jo AB Lawn Steep Jo SiDEWALKS MOD Jo CForest Fa 0 SIDEWALKS STEEP_ o v M PARKING FLAT fo M E Forest Steep o M PARKING MOD Jo M CPatue Flt PARKiNG STEEP Jo CPastue Mod Jo FOND CPatue Step Jo ClamFa Jo Clam Mod Joe _ Clawn Steep Jo PerviousT otal if Actes Impervious Total p 1 Acres Basin Total ffs Actes DeselectZero SelectBy amp 0 For our example we assume that the Predeveloped land use is 1 acre of C soil till with forest vegetation on a flat 0 596 slope LARCH 498 Water amp Soils in the Urban Environment Ba WWHM3 File Edit View Help Lah g Subbasin NamejBaledHiH Winter 2011 Surface Interflow Groundwater zem Element Option List Spree pr ra T Mitigated Connect Ta Element Connect to Point OF Compliance Area in Basin Show Only Selected Available Pervious Available Impervious Disconnect Element E M AB Forest Flat
9. ft Volume at riser head Choose Outlet Structure 1 orifice amp rectangular notch Progress EE Lreate Pond Optimize Pond Accept pond Close p The pond does not yet have any dimensions Click the Create Pond button to create initial pond dimensions and optimize the pond size and outlet structure Once it computes observe the initial dimensions 10 LARCH 498 Water amp Soils in the Urban Environment Winter 2011 AWHA File Edit View Help Da kd 56 ce f Schematic 3 amp Trapezoidal Pond 1 Mitieated Facility Name Outlet 1 Outlet 2 Outlet 3 Downstream Connections p j p Facility Type Precipitation Applied to Facility L AutoPond Quick Pond Evaporation Applied to Facility Facility Bottom Elevation ft p sd Facility Dimensions Bottom Length ft Outlet Structure ERES Riser nan f 2 Bottom Width ft 93 33809511 Trapezoidal Pond 1 Mi Predeveloped Mitigated 0 1 min lt 2 10 min gt 10 min Fast Thorough QMax Pond Depth incl 1 ft freeboard ajf cfs Pond length to width ratio to 1 d 0 01202 Pond Side Slopes to 1 x Bottom Length B3 3380951 ft 2 0 Bottom width B3 3380951 ft Volume at riser head 000 acre ft d n 454 able Computing pond size Computing mitigated runoff Instant pond computed x X xx e NS 0 0 PENES
10. he point of compliance is designated as POC 1 WWHM3 allows for multiple points of compliance Click on the Connect button Again a graphic will show up showing the point of compliance has been added to the pond element This time it is shown with the letter A and a bar chart symbol in the lower right corner Now observe the Trapezoidal Pond 1 Mitigated dimension options in the window the right A trapezoidal stormwater pond can be sized either manually or automatically using AutoPond For this example we will use AutoPond LARCH 498 Water amp Soils in the Urban Environment Winter 2011 Click on the AutoPond button and the AutoPond screen will appear The user can set the pond depth default 7 feet pond length to width ratio default 1 to 1 pond side slopes default 3 to 1 and the outlet structure configuration default 1 orifice and riser with rectangular notch weir Change the pond depth to 3 feet To optimize the pond design and create the smallest pond possible move the Automatic Pond Adjuster pointer from the left to the right The farther you move it to the right the longer it will take to calculate the optimal pond dimensions Move it to somewhere in the middle E Predeveloped BE Mitigated E Trapezoidal Pond 1 Automatic PondAthaste Pond Depth incl 1 ft freeboard ajr Pond length to width ratio 1 to 1 Pond Side Slopes to 1 Bottom Length sid ft Bottom victh L 1
11. n PVROADS FLAT n pee O Me Foet wed 0 muDsMo 18 E MEFaerSep p mowserER lp Copy Ctrl a A B Pasture Flat fe m ROOF TOPS FLAT fo paste cir Re Patue Med p BRWEWAV RAT Jo Delete quan ME Fasu Steep O Dew Jo d Duplicate Predeveloped AME Lawn Flat b DRIVEWAYS STEEP b Save Element Emm Wed Jo SDEWAKSHAT Load Element MTom Sees 1 SUEWAKSMOD Run Predeveloped EfwsHa J SIDEWAKSETEEE p 7 clear Al Foot Seep 1 FARING Import Basin Location C Pasture Flat n J PARKING STEEP n 1 EPsueMe Jo TD 1 EDwmMd lp Move Elements 1 C Lawn Step fe Pervious T otal Acres Impervious Total cS A m Basin Total Acres Deselect era oelect By aay GO The exit or drainage point will be selected as our point of compliance for the Predeveloped scenario Right click on the basin element and highlight Connect to Point of Compliance This connects your basin to the outflow or the sum of all of the flows from your basin to the outflow point LARCH 498 Water amp Soils in the Urban Environment Winter 2011 Point Of Compliance The Point of Compliance screen is shown for the Predeveloped scenario The POC Point of Compliance outlet is checked for Surface runoff and Interflow by default These are the two components of stormwater runoff that we want to POC Outlet ADD mitigate fo
12. ng this file save it on the desktop or in a folder on your PC other than lt C Program Files WWHM3 gt This is the default folder for the installation step Open each file Double click This starts the installation process Follow prompts to complete installation Please note When installing let the programs install in the default subfolder lt C Program Files WWHMS3 gt Computer Requirements e Windows 2000 XP with 150 MB uncompressed hard drive space WWHMs3 is NOT Mac compatible Internet access only required for downloading WWHM3 and the User Manual not required for executing WWHM3 Launch WWHM3 You can launch wwhm3 exe from your desktop The icon has a blue background with a picture of clouds and rain over it LARCH 498 Water amp Soils in the Urban Environment Winter 2011 Exercise to demonstrate pond sizing using the WWHM3 1 Click on the Map Information button and the county in which the project site is located P WWHM3 Eef File Edit View Help D c d er cane o e EN Gmo Toolbar Site Information Site Name Address EN City coo M Precip Fac Y Sr 8 25 2006 10 36 AM Click the down arrow in the box in the upper left corner A list of all 19 Western Washington counties is shown as well as SPU Scroll down and select SPU A map for Seattle will show on the screen as well as different city long term gage data Type in the Site Information Site
13. o the pond Click OK 15 LARCH 498 Water amp Soils in the Urban Environment Winter 2011 Now enter the following information into the Gravel Trench Bed to turn it into porous pavement Be sure to enter YES to Infiltration at the bottom of this window This is what turns the trench bed into porous pavement Then enter the measured infiltration rate and the infiltration reduction factor 16 LARCH 498 Water amp Soils in the Urban Environment Winter 2011 Porous Pavement Mitigated Outlet Structure Fise Heia f H Riser Diameter in 24 we Notch Type Orlice Diameter Height OMax Humber In FQ cts 1f 4h au 2 Ho sa 3 n Ho a Infiltration ies H Trench Volume at Fliser Head octet 000 BMeassediniuaionRaelr h po nj Part treme oo 4 flirton Reduction Factor 5 2 Show Pond Table GpenTatie H Buse Wetted Sudace Area sidewa No Total Volume Irfitratedi acre Total Volume Through Faciitiscre fi B Total Vokme TivcughR sedace O Percent Infitrated 0 Now click on the Trapezoidal Pond and select the Auto Pond button again Click on Optimize Pond How have the dimensions of your pond changed Run the Analysis again and produce a second report Please turn in the two reports of the mitigated flows one with just the trapezoidal pond and the other with the pond porous pavement 17 LARCH 498 Water amp Soils in the Urban Environment Winter 2011 Adding other Elements There are several
14. r do not check the groundwater box Element Ballard High W Surface w Intertlows Click the Connect button to connect this POC to the Predeveloped basin Groundwater Notice now that the basin element has changed A small box with a bar chart graphic shows up in the lower right corner of the basin element This graphic _ Connect chart identifies this basin as a point of compliance Ba WWHM3 File Edit wiew Help Lae amp Sl Mitigated 3 Set up the Mitigated scenario First check the Mitigated scenario box and place a basin element on the grid You will enter the Mitigated land uses in the Mitigated window to the right Enter the following land uses 3 acres of C lawn flat 3 acre of roof top flat 15 acre of driveway flat 15 acre of sidewalk flat acres of parking flat LARCH 498 Water amp Soils in the Urban Environment Winter 2011 4 Add a trapezoidal pond Next add a trapezoidal pond downstream from the basin Select the trapezoidal pond element and click on two grids below the basin element Ba WWHM3 File Edit View Help Leh amp Facility Name Trapezoidal Pond 1 Outlet 1 Outlet Outlet 3 Downstream Connections ff 18 7 Facility Type Precipitation Applied to Facility Auto Fond Quick Fond Facility Bottom Elevation f n Facility Dimensions Bottom Length ft Bottom width ft Effective Depth ft Left Side Slope H Bottom Side
15. unces that it 1s finished The pond is now re sized You may continue to manually optimize the pond by manually changing pond dimensions and or the outlet structure configuration in the original pond dimension window to the right of the Schematic grid After making these changes you should click on the Optimize Pond button again to check the results and see if AutoPond made further improvements Spend several minutes experimenting with different dimensions and try to optimize the pond so that the mitigated flow duration is similar to the predeveloped flow duration 5 Review analysis The Analysis tool bar button third from the left brings up the Analysis screen where the user can look at the results Each time series dataset 1s listed in the Analyze Datasets box in the lower left corner To review the flow duration analysis at the point of compliance select the POC 1 tab at the bottom and make sure that both the 501 POC 1 Predeveloped flow and 801 POC 1 Developed flow are highlighted 12 LARCH 498 Water amp Soils in the Urban Environment Winter 2011 WWHM3 ME Fie Edit wiew Help eA Lgs al ES The Facility PASSED L 801 POC 1 Mitigated flow n The Facility PASSED Flow CFS Predev Dev Percentage Pass Fail 0073 aS 2952 Pass 0083 2498 eh don Pass 0092 2092 1924 Pass 0102 1764 1644 Pass OEL 1519 1409 Pass alaja lAa 1241 1180 Pass almia ke du 1017 1017 Pass 837 829 Pass 692 653 Pass 607 476 Pass 520 ama Pass 439
16. w flow data for the mitigated scenario Change the colors so that each time series of data will be graphed in distinct colors In the Plot Hydrograph box select Monthly and Peaks Click on Graph to produce a graph 6 Produce Report Click on the Reports tool bar button fourth from the left to generate a project report with all of the project information and results Scroll down the Report screen to see all of the results Save your report 7 Add Porous Pavement To help reduce the size of the stormwater pond you can add porous pavement to your basin Close the Report screen and the Analysis screen Click on the Schematic Editor Window with the grids basin and pond icons Select the Gravel trench bed element and add it to the grid cell between your basin and your pond i e place it downstream from your basin and upstream from your pond 14 LARCH 498 Water amp Soils in the Urban Environment Winter 2011 Ba WWHM3 File Edit View Help Dae amp Right click on the Basin icon and select Disconnect Element Right click on it again and select Connect to Element Click on the Gravel Trench Bed to have the Basin connected to the Gravel Trench Bed Next Right click on the Gravel Trench Bed and select Connect To Element Click on the Trapezoidal Pond to have the Gravel Trench Bed connect to the pond This will bring up the flow From Facility to facility window This shows that outlet 1 of the Gravel Trench bed will flow t
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