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D 3. Does welland unit 6ive the otn enti�l to reduee Iloodiog/ero�ion? (sre p I6) <br />D 3.1 Charactcristics of surface water Ilows out of �he welland: <br />❑ Unit is a dcpression with no surfece water leaving it (no outlet). Poinb = 4 <br />❑' Unit has an intcrminently 1lowing, OR highly constrictcd pertnenently Poinb = 2 <br />flowing outic4 <br />❑ Unit is a"Oa�" dcpression (Q. 7 on kcy), or in the Flats class, wilh Points = 1 Z <br />permancnt sorface outflow smd no obvious nNunl outlet and/or outlet <br />is a man•madc dilch. (Ijdi�ch is notpermanenttyJfowing, trea� unit at <br />"infermiuenflyflowing. ) <br />Unit has an unconsVicted, or slightly consvicted surCace outlet Poinb = 0 <br />� (permanen�lyJfowing). <br />D 3.2 Depth oC storage during wct periods. <br />Fstimnte �he height ojponding above thc bofrom ojrhe ouf/ef. For unilt with no ovflet <br />measure jrom �he surjace ojpermanenf water or deepest part (ijdry). <br />❑ Marks of ponding are 7 fmt or morc above the surface or pouom of outicL Poinb = 7 <br />❑ 7'6e woUand is a"headwattt" we�and Poinb = 5 3 <br />❑ Marks of ponding benvecn 2 fat to �3 ket froro surface or bonom af outleL Poinh = 5 <br />❑+ Marks are at Ienst 0.5 fcct to Q fat from surface m bonom of outld. Poiob = 3 <br />❑ Wc�lend is tlat (yes to Q. 2 or Q. 7 on kry) but hss small deptessioas on the Polnd = 1 <br />surface IAat Uap wo�cr. <br />� Marks of ponding arc less �an 0.5 faL Poieb = 0 <br />D 3.3 ConVibution oCwctland to storage in the watcrshed. <br />Fs!imnte the rn�io oj�he area ojupstrenm basin cont.i6u�ing surjace water to �he we7land �o <br />thc area ojthe wedand itself. <br />+❑ The arca of thc basin is <10 timcs ihc area of thc unit Polnl� � 5 5 <br />❑ The nrca of thc basin is 10 to 100 times thc area of thc unit. Points-3 <br />❑ Thc nrca of thc b�sin is>I00 timcs the arca of thc unit Polon -0 <br />❑ Entirc unit is in ihc Fl�b cluss buin=wctland Polu� -5 <br />Total for D 3 Add �he poin�s in �he baces above �0 <br />D 4. Don wet6nd unil hrve tAe opportunity to rcdute Oooding/erosion? (see p!9) <br />Answer YES if thc unil is in a location in the watershed whcrc the tlood storagc, or reduction <br />in water velocity, helps protect downstrcam propeny ::nd aqaatic rcsources Crom Oooding or <br />cxccssivc and/or crosive tlows. <br />Mswer NO iC the water coming inlo lhe weAmd is controlled by n sweturc such es flood gete, <br />tide gulc, Oap valve, rescrvoir, ctc. OR you estimntc thet morc thnn 90% of Uu weter in ihe <br />wetlnnd is Gom groundwatcr in arcus whcre dnmoging groundwatcr flooding docs not occur. <br />Note which oj�he jollowing indicators ojopportuniry apply: <br />❑ Wctland is in a hcadwnter of a river or stream thet hns Oooding problems. <br />� Wctlnnd drains to a rivcr or svcnm thet has 1looding problcros. <br />❑ Wctland has no outict nnd impounds surfacc runo(f water that might otherwise llow <br />into a river or svenm thal hns Ilooding problems. MW"P��� <br />❑ O�hcr. Z <br />YGS - multi licr is 2 NO - multi lier is 1 <br />TOTAL - Ilydrologic Funetions Multiply the score from D 3. by D 4 Zp <br />Add scare !n ta6/e on . / <br />Welland Rating Form - Westem Washington <br />