Presentation of Runoff

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					RUN
OFF
                Kar
                     am D
                (B-15     ad A
      up                       wan
   bers
                      708)
              Mu
  Gro
                   ham
              Haro mad
Mem
                    on (B
            Usm         -157
                  an R        45)
            1573       ashid
                  5)         (B-
                 De
                        finit
                               ion:


     O FF
                   “It is
                 rainf that port
                        all, w        ion o
                way             hich        f
                       towa           mak
               river          rds s        es its
R UN
                      s etc         tream
              satis          . Afte        s,
                     fying          r
             losse           the i
                     s etc         nitia
            runo           ”. is         l
                  ff             calle
                                       d as
      FF
              Su
   UNO            rfac
                       e run
             Su             off
                 b-s
                      urfa
            Ba            ce ru
 OF R

                se fl            noff
                      ow
TYPE
                      It
                          is tha
                        whic t port
                       imm h enters ion of ra
                      It oc ediately the stre infall
                     satis curs. Wh after th am


         f
     unof
                     cont fied and en all loe rainfa
                    grea inued, w if rain i sses ar ll.
                   at th ter than ith the r s still e
                  mak is stage in filtra ate
         R
                  grou es a hea the excetion rate
                 dete nd surfa d over t ss wate ;
     ace

                 mov ntion) w ce (surf he          r
                anot e from o hich ten ace
               flow.her, kno ne plac ds to
              flow As soonwn as o e to
Surf




             chan joins to as the verland
             as su nels or the stre overlan
                   rface ocea        ams,      d
                          runo ns, ter
                               ff       med
                     Th
                            at pa
                       first      rt
                       mov    leach of rainf
                             es la es into all, whic
      face
                      joini
                            ng thterally wthe soil h


       off
                     the S
                    is kn   tream water ithout and
                                  e
                           own s River - table t
   Run             runo
                          ff. So as sub - s or oce o
 - sur
                  surfa
                  unde   ce rumetime surface ans
                 reas    r ser noff is as sub -
                time   on th vice ru lso aer
               chan    to re at it take off dueated
                                       n
                      nel i ach the s very t to
Sub



               grou
              surfa  nd w n compa river or itle
             refer   ce ru ater. Th rison to
                    red a noff is u e sub -
                            s inte suall
                                  rflow y
                                        .
                 It
                       is de
                    that     lays
                         part       flow,
                   after       of ra      defin
                                                  e
                  surfa falling o infall wh d as

 flow
                                     n           i
                soil a ce in fill the gro ch
                                    r
               table nd meet ated intound
              ocea and flows so the w the
              wate ns etc. T to the s ater
Base
                                 h           t
             very r in this t e movemreams
                                 y
            also slow tha pe of ru ent of
                               t
           runo referred is why i noff is
                                           t
          join ff. It take as delay is
                t            s            e
         Som he rivers a long t d
               e
        know times b or ocea ime to
                n as       ase f        n
                      grou         low i s.
                            nd w        s als
                                    ater       o
                                         flow
        re
        ff
   runo
   easu
                Cu
                    b Fe
               Se       et/Se
                   cond         cond
 to M


              Ac        Feet
                  re-Fe        Day
                        et (A      (S.F.
                                         D)
                              .F)
Units
                      It i
                            s the
                       disch volume
                                arge
                      at th
                            e rat    d for of water
                                            24 ho

          y
                     per s         e of
                                        1 cub urs


         D)
    et Da                   econ              ic fee
                  On              d
                        e da                        t
   (S.F.           24*6 y conta
                         0*60           in
                                 seco
      e

                  Then                 nd
                         1 S.F
 nd F


                 cubi
                       c fee .D = 24*
                cubi           t=24        60*7
                      c fee         *360        0
                             t            0
Seco




               1 S.F
                     .D=
              feet        8640
                                  0 cub
                                         ic
Acre
       feet
           
              (A.F)
            ng
             f
                       Majo

        unof
                             r two
       fecti
                      effec        type
                            ting
                  1. Cl          on R factors
                        imat          UNO
  the r
                             e con         FF
 rs ef


                 2. To             ditio
                       pogr              n
                             aphi
                                  cal
Facto
                   Ty
                        pe o
                              f pre
                 Int               cipit
                       ensit              ation
                             y of p


       n
                Du                 recip
                      ratio

      tio
                            n of           itatio
               Ot               rain            n
  ondi              her C              Fall
              Di          lima
                   recti         te Fa
                         on o          ctors
               mov
                     eme f storm
 ate c


             So          nt
                 il mo
                       istur
                             e
Clim
                 Ty
                       pe o
                             f Pre

      tion
                  Its is           cipit
                         more            ation
                 runo
  ondi                 ff the influenc
                flowi          wate        e on
                       ng o
               surfa         n the r will sta
                      ce d          grou       rt
                            irect
              in th               ly.it nd
 ate c


                    e for              ppt i
             melt s m of s                   s
                    1 t th        now
             be st         en ru        is to
                   art.          n off
                                       will
Clim
                    Int
                         ensit
                                y of P
                     The                  recip
                          inten                   itatio


      tion
                    affec         sity o                n
                          t the
                   grea           run o f PPT
  ondi            of ra t extent. ff to a
                        in fa          If int
                 run o        ll is g         ensit
                 beca ff will sta reater th y
                chan use ther rt rapidl e
                                   e wil
 ate c


                      ce of                        y
              e.g.           filtra        l be
                     in Su           tion.        no
             If int        mme
                   ensit           r
Clim




             will a      y is l
                    lso le      ess r
                           ss           un o
                                               ff
                 Du
                       ratio


      tion
                              n of
                  The               Rain
                        dura               Fall
                 effec         tion
  ondi                 t the         of ra
                fact t         run o       in
                      hat d           ff du
               the i          uring         e to
                     nfiltr
              into          ation rain fall
 ate c


                    the s          of wa
             decr         oil g
                   easin         oes o ter
             more         g du           n
                    run o         e to
                           ff is a which
Clim




                                   ppea
                                          red.
                       O
                            ther
                                  Clim
                         Tem            ate F
                         Radi  pera           actor
                                    ture            s



      tion
                              ation       , Hum
                        Tem                      idity
                      solar  pera                      , Sol
                                  ture                       ar
                     run o   radia      hum
                            ff. Gr tion als idity an
  ondi
                    temp
                   losse    eratu eater th o effect d
                           s due re grea e            the
                  lesse
                 grea     r wil to evapter will
                         ter m l run off oration be
 ate c

                PPT
                        to oc ore wil . If Hum so
                              cur s     l         i
               If an                o mobe chandity is
               NOR area is e              re Ru ce of
              solar THEN d xposed               n Off
             run o radiatioirection to
Clim




                     ff         n so      less
                                      less     will b
                                            will b e
                                                  e
                      Di
                           recti
                       Mov on of S
                             eme       torm
                      It ha       nt


      tion
                            s
                     storm be obse
                    direc moving rved tha
  ondi             in th   tion       in th     t the
                         e dra of flowin e
                   whic
                  off a  h pro inage ba g water
                        nd th duce m sin
                 rema         e wa     ore r
 ate c


                shor in in the ter will un
                      ter ti
               the c         me a basin for
              in th ase will s s compa
                    e
             flowi opposit top mov re to
Clim




                    ng w        e dir     ing
                          ater       ectio
                                           n of
                     So
                            il Mo
                                   istur
                       If the            e
                     soil c surface l


      tion
                              ertai        ayer
                    then             n mo          of th
                            the s          istur        e
                   low c           oil w          e
  ondi                      apac         ill ha
                  rain            ity to         ve
                          wate
                 smal           r.so observe
                         l rain        even
                high             will p       very
 ate c


                        run o           rodu
               othe
                      r han ff. On the ce
              dry i           d if t
                     t will         he sa
             more             obse         il is
Clim




                                     r
             will l water so ved
                   ess             run o
                                          ff
                 La
                      nd u
                           se
               Ty
                    pe o


   cal
                          f soil
              Ar
                   ea of
      i                   drain
  raph       Sh
                  ape            age
                        of dr         basin
            El
                evat          ainag
                      ion o         e ba
             basin                        sin
    g

                            f dra
                                  inag
Topo


           Slo                        e
                pe o
                     f dra
                           inag
                                 e ba
                                      sin
                          In
                     devi field m
                           ces f       o
                     W           or m st comm
                                        easu      o
                            eirs             ring nly used

        ring
       ices
                    Pr                            wate
                          e sha                         r are
                   O            ll flu
                        rifice          mes
                               s
   easu
   Dev            M
                       eter
                             gate
                   In th            s
               flow      ese d
              mak is meas evices ,
             is pa ing readured dir the reac
 off M



             com rt of ins ing on a ectly by t of
                  p          t
            stand uting th rument scale w
           use o ard for e disch and               hich
           depe f one ormulae .c arge ra
          rates nds on others hoice fote from
Run




                 site c the ex devis             r the
                       ondi         pect e
                              tions      ed fl
                                     .         ow

				
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