FLOOD08374

• County: Statewide
• Community: New England
• Basin: Statewide
• Title: Modelling the Dynamic Response of Floodplains to Urbanization in Eastern New England Completion Report
• Date: 1/1/1978
• Prepared By: CSU Environmental Resources Center
• Floodplain - Doc Type: Educational/Technical/Reference Information

-15-

hydrologic response. This coding system is applied to a hypothetical

network in Figure 3. Source links are coded as +2 or +1, depending on

the presence or absence of a pond in the link. Interior links are coded

as 0, -lor -2, depending on the occurrence of ponds and their position

,

with respect to the upper junction. The vector of integers is derived

by proceeding headward from the outlet and first including the subdrain-

age with the least number of sources at each junction. Hence, the basin

depicted below would be coded as

( 0 -2 1 1 0 2 0 0 1 2 -1 1 0 1 1 ).

The main channel of each watershed is then specified as the channel whose

source corresponds to the last element in this vector, and its length is

measured from the topographic maps.

.

/
/
,
,
,
I
I
,
,
,
I
I
\
\
\
I
I
I
,
/
I
,
/
,
I
\
'-
,
"
I
J
I
I
I
I
I
\
,

i

, -,
,
'-
,
'-
" -

/
/
/
/

...-........
,
,
,
,
, (3) ",
\
\
,
,
,
,
,
I
I
J
I
\
,
-2 (2) \
,
,
\
,
I

------

---

---.....

/
/
/

, (14)

o {I3}
-, {II}

...-------

,-

-----

/
I
I
I
,
I
I
,
I
,
,
/
----~

Number in parentheses
signifies position in
coded network vector

-

-
......-------

FIGURE 3. Method of coding the drainage network.