PEAK-FLOW CODES

Discharge Codes
1 discharge is a maximum daily average
2 discharge is an estimate
3 discharge affected by dam failure
4 discharge less than indicated value, which is minimum recordable discharge at this site*
5 discharge affected to unknown degree by regulation or diversion**
6 discharge affected by regulation or diversion**
7 discharge is an historic peak***
8 discharge actually greater than indicated value
9 discharge due to snowmelt, hurricane or debris dam breakup
A year of occurrence is unknown or not exact
B month or day of occurrence is unknown or not exact
C all or part of the record affected by urbanization, mining, agricultural changes, channelization, or others
D base discharge changed during this year
E only the annual maximum peak exceeded base discharge this year.
* Code 4 cannot occur simultaneously with codes 1, 2, 3, 7, or 8.
** Codes 5 and 6 cannot occur simultaneously.
*** Code 7 should indicate that the value for the particular year is an historic peak and the particular year occurred before or after the systematic record, or during a break in the systematic record.
Gage-Height Codes
1 gage height affected by backwater
2 gage height not the maximum for the year*
3 gage height at different site and/or datum
4 gage height below minimum recordable elevation
5 gage height is an estimate
6 gage datum changed during this year
* If code 2 is given here, then a date and data entries should be made for the maximum annual gage height.
Maximum Gage-Height Codes not Associated with Annual Peak Flow
1 gage height affected by backwater
3 gage height at different site and/or datum
5 gage height is an estimate
6 gage datum changed during this year


Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data