﻿511 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  Nothing 
  is 
  known 
  as 
  to 
  the 
  minimum 
  yields 
  of 
  streams 
  tribu- 
  

   tary 
  to 
  the 
  Allegheny, 
  Susquehanna 
  and 
  Delaware 
  rivers, 
  aside 
  

   from 
  the 
  measurements 
  of 
  Eaton 
  and 
  Madison 
  brooks 
  made 
  in 
  

   1835. 
  So 
  far 
  as 
  can 
  be 
  learned, 
  aside 
  from 
  those 
  recently 
  

   inaugurated 
  by 
  the 
  United 
  States 
  Geological 
  Survey, 
  no 
  measure- 
  

   ments 
  of 
  any 
  other 
  of 
  these 
  streams 
  have 
  been 
  made. 
  It 
  is 
  prob- 
  

   able 
  that 
  they 
  will 
  mostly 
  be 
  found 
  substantially 
  the 
  same 
  as 
  

   Genesee 
  river 
  and 
  streams 
  issuing 
  from 
  the 
  Catskill 
  region. 
  

  

  Quantity 
  of 
  water 
  which 
  may 
  ~be 
  stored 
  on 
  the 
  several 
  plateaus. 
  

   The 
  foregoing 
  treats 
  of 
  the 
  yield 
  of 
  streams 
  in 
  a 
  general 
  way, 
  

   but 
  the 
  practical 
  summation 
  of 
  the 
  preceding 
  discussion 
  is 
  as 
  

   to 
  the 
  quantity 
  of 
  water 
  that 
  can 
  be 
  safely 
  stored 
  on 
  different 
  

   catchment 
  areas 
  of 
  New 
  York 
  in 
  the 
  year 
  of 
  minimum 
  runoff. 
  

   The 
  tables 
  of 
  precipitation 
  on 
  the 
  several 
  plateaus 
  show 
  that 
  the 
  

   quantity 
  which 
  can 
  be 
  stored 
  varies 
  in 
  different 
  parts 
  of 
  the 
  State 
  

   and 
  in 
  some 
  degree 
  in 
  proportion 
  to 
  the 
  rainfall. 
  It 
  is 
  also 
  shown 
  

   that 
  when 
  the 
  rainfall 
  is 
  above 
  a 
  certain 
  minimum 
  amount, 
  the 
  

   excess 
  quantity 
  of 
  runoff 
  is 
  roughly 
  in 
  proportion 
  to 
  the 
  rainfall. 
  

   In 
  order 
  to 
  emphasize 
  the 
  preceding 
  propositions, 
  we 
  have 
  the 
  

   following 
  as 
  the 
  mean 
  rainfalls 
  of 
  the 
  ten 
  plateaus 
  into 
  which 
  the 
  

   area 
  of 
  New 
  York 
  is 
  divided 
  for 
  the 
  twelve 
  water 
  years 
  1891-1902, 
  

   inclusive, 
  together 
  with 
  the 
  low 
  rainfalls 
  of 
  1895 
  and 
  1899. 
  

  

  Mean 
  of 
  1895, 
  1899, 
  

  

  12 
  years, 
  inches 
  inches 
  

  

  inches 
  

  

  Western 
  plateau 
  37.03 
  29.70 
  27.65 
  

  

  Eastern 
  plateau 
  10.30 
  32.87 
  35.26 
  

  

  Northern 
  plateau 
  11.03 
  36.67 
  35.79 
  

  

  Atlantic 
  coast 
  16.71 
  10.77 
  11.51 
  

  

  Hudson 
  valley 
  12.59 
  35.71 
  37.98 
  

  

  Mohawk 
  valley. 
  . 
  . 
  12.13 
  31.30 
  35.31 
  

  

  Champlain 
  valley 
  37.06 
  32.95 
  33.85 
  

  

  St 
  Lawrence 
  valley 
  36.18 
  33.75 
  28.51 
  

  

  Great 
  Lakes 
  35.65 
  29.13 
  28.67 
  

  

  Central 
  Lakes 
  31.16 
  27.31 
  27.83 
  

  

  The 
  difference 
  in 
  the 
  average 
  precipitation 
  of 
  the 
  Atlantic 
  

   coast 
  and 
  the 
  Central 
  Lakes 
  regions 
  is 
  12.25 
  inches. 
  We 
  may 
  

   expect, 
  therefore, 
  about 
  10 
  to 
  11 
  inches 
  more 
  average 
  runoff 
  in 
  

  

  