Suivi de la qualité des eaux de l`Yvette amont et de la Rémarde amont

  Eurofins Expertises Environnementales
!
!"! !#$!"! !%
&''()'*+(
Suivi de la qualité des eaux de l’Yvette amont et de la
Rémarde amont
Présentation et interprétation des résultats hydrobiologiques
- campagne 2013 -
Rapport n°14FHCH023
Version2

,,,-.(,(',(
/''&','(&0!
&&'1$22!
3',%
!
SOMMAIRE
I. INTRODUCTION ................................................................................................................................... 4
II. METHODOLOGIE ................................................................................................................................ 5
II.1 - Etude du peuplement des macroinvertébrés ................................................................................... 5
II.2 - Etude du peuplement des diatomées ............................................................................................. 11
II.3 - Evaluation de l’état physico-chimique ......................................................................................... 17
II.4 - Evaluation de l’état écologique .................................................................................................... 18
III. STATIONS DE PRELEVEMENT ..................................................................................................... 20
III.1 - Bassin versant de la Rémarde ..................................................................................................... 20
III.2 - Bassin versant de l’Yvette ........................................................................................................... 21
IV. CONDITIONS DE PRELEVEMENT ET LOCALISATION DES POINTS ..................................... 22
IV.1 - Bassin versant de la Rémarde ..................................................................................................... 22
IV.2 - Bassin versant de l’Yvette ........................................................................................................... 22
V. PRESENTATION DES RESULTATS ................................................................................................ 23
VI. INTERPRETATION DES RESULTATS ........................................................................................... 26
VI.1 - Bassin Versant de la Rémarde .................................................................................................... 26
VI.2 - Bassin Versant de l’Yvette ........................................................................................................... 27
VII. CONCLUSIONS ............................................................................................................................... 29
ANNEXE 1 : RAPPORTS D’ESSAIS IBG-DCE ET IBD
ANNEXE 2 : FICHES D’INTERPRETATION

,,,-.(,(',(
/''&','(&0!
&&'1$22!
3',%
!!
Liste des figures
$0',,,*,4056+++++++++++++++++++++++++++++++"
$0',&,&'7('4',(',+++++
$0'!,&,&'7('4,-.+++++++++++++++++++++++
$0'548''(9,(',:#9'##5',',(
,8!;'<=9,';=&>>>+=9,'+*'+*'?++++++++++++++++++++++++++++++
$0' 548''(9,-.:34#'#.',(,8
!;'<=9,';=&>>>+=9,'+*'+*'?++++++++++++++++++++++++++++++++++++++++++++
Liste des tableaux
@4A',,-<AB++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++"
@4,40*,-<AB-''C, 8'
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++D
@4!,-=&*,',**('&=,9(+
@4   ,  40  * , E<5  E''C ,   8'
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
@4 (,,-&'&'(7'-''C, 8'++++++++%
@4,=!'4',
(',++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
@4%,=!'4',-.+++++
@4",(&0<A#56,!++++++++++++++++++++++++++++++++++++++++++++++++++++
@4D,(&0<5,!+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
@4@4'&*,,40=(4
!++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
@46(&',-40,',-'4'
,(',++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++%
@46(&',-40,',-,4',
-.+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++"

,,,-.(,(',(
/''&','(&0!
&&'1$22!
3',%
!
I. INTRODUCTION
5,',,,',-'''',/'B'
0 ,  2 3 , ='F 6'* 6&' 6'(  
='0 , '' , 9 =9,'40 &' '  &&( ,
(''4'4=,,(+
9:('',',-(0(:4'
&''':(',-,G40H*&' 
5','6'&'-&' +
 (''4'   '0'& -(4 , '0( '4'
4 : -I   ,  ' ,-;F 'F (F 4F
'F 0F etc?  '  ** &' &''  &&( , 
(& 4'' : , - ;&''' (7'
'0?-:',=4&'+5-'&'F'0(
4,'70'&''4,(,(&,*,'&
,''(+
,(F0('&,'4'J'4,,(
F &'  :    , (F  ,'  
4,'0&',(4'&'(7'(((&'',-F
, 'F  &2F  F  (7' '0F  '   , - (
0(   ,-'&= , (+ ' 0', ' #:# , 
&'(7''  ,-C' 8',-= ((,' 40 , 
,,'*+
 (&0 ,-=0 , !   '  &', ,-0 F , 
8D8'',-,,&'(,.;%"?+5
&'&=(=,<A#56<5*,-'
40,(+
 &' '&&' ', (& , ' ,  (&0 , &'7(
=9,'40 ( 0( , ' '&'  '0', , , &=9#
=(''&, ,-=',,40,&4' 
(C(,('+

,,,-.(,(',(
/''&','(&0!
&&'1$22!
3',%
!
II. METHODOLOGIE
II.1 - Etude du peuplement des macroinvertébrés
&'7(9,=,(''4'4=
**(=,,G<A#56H,','(K/@D#!!!K/@
D#!""   '' 56 %+  &'F 4' &' -L' , M  
6A6$ , 9F &'0  '&' , 4'   ( 
=0'4'&'&''7407+5&F
  , ,'(  & &  &' -, <0 A4
B'(;<AB?F0''='=&'(8',+
II.1.1. Prélèvements des échantillons
Choix et positionnement de la station de prélèvement
:=',*:&'',*'(&'*'&'
N',-O'0(,',-F((F',,.
*,'*','&'&'7(',''
,'&*,,&'7(F&''**'&'0&,',
 , &'7(  , ' ,&  4'0   &'
,-=0+((,','&7'
* ''&,  &4  ( , *7 ,-( &'+ 
',(4',,(( ''&
&&'A/+
Repérage des différents supports
L*,(0';?,*F(','0'(
(9**(7'''&'''&''+
'0' ( (9 ;(? &'( , '  '* ( ;(? ,  
;( P  Q (?+  '* (( ,- 4' ,(F 0 :  R ,  '*
('+
 ,**' 4' &' '     '&'F ' '* ,
''('R ','4,, 
&'',*+',&F-(4,&,&'7(
&'&&''4(&4*,+
 4' '&' '  & , &'7(  , '  4
,-=0,*=,''&''5FFB/
- L4'dominant;5?'*(&''0: R,
'*(,+
- L 4' marginal ;?'&'*  '* ( *'' :  R , 
'*(,+
- L4'marginal non représentatif;B?'*(*'': R
,'*(,('7',,&
C'&'+
- L 4' présent ;/? (  &'  (& ' 9  '* 0S
((*'':
7(
,( +