EPANETTOOLS 0.5.0.1

EPANET 2.0 calls from python

Python interface for the popular urban drainage model EPANET 2.0 engine. EPANET2 is realeased by United States Environmental Protection Agency to public domain. This python package is copyrighted by Assela Pathirana and released under GNU General Public License version 3.

README.txt

Epanet 2.0 Python calling interface

Since version 0.4.0.1 the library is compatible with Python 3.0

What is it?

A python package enabling user to call all the epanet programmers toolkit functions within python scripts.

Installation

Windows:

Download the MS Windows installer and run to install. Since version 0.4.0.1 “python wheels “ packages are also provided. So, the following command can also be used to install on windows

pip install epanettools

POSIX (e.g. Linux, OS-X):

Download source archive (zip file), extract and run (as root)

[sudo] python setup.py install

or just type

[sudo]  pip install epanettools

Usage:

>>> import os
>>> from epanettools import epanet2 as et
>>> from epanettools.examples import simple
>>> file = os.path.join(os.path.dirname(simple.__file__),'Net3.inp')
>>> ret=et.ENopen(file,"Net3.rpt","")

Example 1:

Retrieve simulation properties.

Basic properties of the network

>>> ret,result=et.ENgetcount(et.EN_LINKCOUNT)
>>> print(ret)
0
    >>> print(result)
    119
>>> ret,result=et.ENgetcount(et.EN_NODECOUNT)
>>> print(ret)
0
>>> print(result)
97
    >>> node='105'
    >>> ret,index=et.ENgetnodeindex(node)
    >>> print(ret)
    0
    >>> print ("Node " + node + " has index : " + str(index))
    Node 105 has index : 12

Get the list of nodes

>>> ret,nnodes=et.ENgetcount(et.EN_NODECOUNT)
>>> nodes=[]
>>> pres=[]
>>> time=[]
>>> for index in range(1,nnodes):
...     ret,t=et.ENgetnodeid(index)
...     nodes.append(t)
...     t=[]
...     pres.append(t)
>>> print (nodes)       #doctest: +ELLIPSIS
...                     #doctest: +NORMALIZE_WHITESPACE
    ['10', '15', '20', '35', '40', '50', '60', ..., '275', 'River', 'Lake', '1', '2']

Get nodes indexes on either side of a link with given index

>>> et.ENgetlinknodes(55) # note the first item in the list should be ignored.
[0, 5, 46]

>>> patId = "NewPattern";
>>> ret=et.ENaddpattern(patId)
>>> print(ret)
0
>>> import numpy as np
>>> patFactors=np.array([0.8, 1.1, 1.4, 1.1, 0.8, 0.7, 0.9, 0.0, 0.8, 0.8, 0.0, 0.0],
...                      dtype=np.float32)
>>> ret,patIndex=et.ENgetpatternindex(patId)
>>> print(patIndex)
6
>>> et.ENsetpattern(patIndex, patFactors)
0
>>> et.ENgetpatternid(6)[1]
'NewPattern'
>>> et.ENgetpatternlen(6)
[0, 12]
>>> [round(et.ENgetpatternvalue(6,i)[1],3) for i in range(1,12+1)]
[0.8, 1.1, 1.4, 1.1, 0.8, 0.7, 0.9, 0.0, 0.8, 0.8, 0.0, 0.0]
>>> et.ENsetpatternvalue(6,9,3.3)
0
>>> [round(et.ENgetpatternvalue(6,i)[1],3) for i in range(1,12+1)]
[0.8, 1.1, 1.4, 1.1, 0.8, 0.7, 0.9, 0.0, 3.3, 0.8, 0.0, 0.0]

Hydraulic Simulation

>>> et.ENopenH()
0
>>> et.ENinitH(0)
0
>>> while True :
...    ret,t=et.ENrunH()
...    time.append(t)
...    # Retrieve hydraulic results for time t
...    for  i in range(0,len(nodes)):
...        ret,p=et.ENgetnodevalue(i+1, et.EN_PRESSURE )
...        pres[i].append(p)
...    ret,tstep=et.ENnextH()
...    if (tstep<=0):
...        break
>>> ret=et.ENcloseH()
>>> print([round(x,4) for x in pres[0]])   #doctest: +ELLIPSIS
...                                         #doctest: +NORMALIZE_WHITESPACE
    [-0.6398, 40.1651, 40.891, 41.0433, ..., 0.569, -0.8864, 0.2997]

Pressure at the node ‘10’

>>> ret,ind=et.ENgetnodeindex("10")
>>> print (ind)
1
>>> print([round(x,4) for x in pres[ind+1]]) # remember epanet count starts at 1.
...                                          #doctest: +ELLIPSIS
...                                          #doctest: +NORMALIZE_WHITESPACE
    [12.5657, 12.9353, 13.4351, 14.0307, ..., 13.1174, 13.3985, 13.5478]