Updated README.

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README.md

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-# California DWR Detailed Analysis Units
+# California DWR Detailed Analysis Units (2003)
 
 In the past DWR has maintained a listing of California's Detailed
 Analysis Units (DAUs) used by the state for water planning.  While
 still avialable, this data is harder to find online.  This repository
 maintains a copy of the dau original source files, as well as a few
 alternate formats.
 
+This dataset is the DWR Version 20, December 2003.
+
+## Overview
+
+The Department of Water Resources (DWR) uses Detailed Analysis Units (DAU) as 
+the base geographic unit for most statewide planning purposes.  There are 278 
+DAU's that cover all of mainland California.  The DAU's are nested inside 46 
+Planning Subareas (PSA), which in turn are nested inside of 10 Hydrologic 
+Regions (HR). 
+
+## Attributes
+
+We use a subset of the attributes supplied in the original file
+
+--- | ---
+dau_code | The DAU code (3 character string) of the delineated area
+dau_name | The DAU name (character string) of the delineated area
+psa_code |The PSA code (3 character string) of PSA encompassing the delineated area
+psa_name | The PSA name (character string) of the PSA encompassing the delineated area
+hr_code	 | The HR code (2 character string) of the HR encompassing the delineated area
+hr_name	| The HR name (character string) of the HR encompassing the delineated area
+dauid_code | The DAU identification code (8 character string), which is a concatenation of the HR_CODE, PSA_CODE, and DAU_CODE.   
+pa_no | The California Planning Update area number (6 character number).
+
+
+## Process
+
+1.  DWR used, as a starting point, the vector data from Calwater 2.0.  This 
+vector data was provided to all four DWR District Offices.  Each District 
+Office made the decisions as to which vector lines were to be used from the 
+Calwater 2.0 data.  
+
+2.  The District Offices then digitized, from previously drawn DAU boundaries 
+drawn on USGS 1:24,000 maps, those DAU lines which were not taken from the 
+Calwater 2.0 data.  
+
+3.  All four Districts' digital data was then brought together at Headquarters 
+into one file, and run through quality control procedures to clean up the 
+linework, and attribute each DAU appropriately, creating a draft digital map.  
+
+4.  The draft DAU digital map was reviewed by Headquarters and the four 
+District Offices, and all discovered errors were corrected.  
+
+5.  Two products were finalized:
+
+  a.  An AUTOCAD DWG file, DWRDAUV10.DWG (version 1.0), which contains the 
+  linework and limited attributes (just the DAU code).  
+  b.  A Shape file(s), DWRDAUV10.SHP, .SHX, .DBF (version 1.0), which 
+  contains the polygons and the complete attributing of each polygon.  
+
+6.  In December of 2003, an error was corrected in the boundary on the valley 
+floor between the Tulare Lake Region and the San Joaquin Region.  It resulted
+in a new shape file, DWRDAUV20.SHP.  The only major change that resulted was, 
+on the westside, DAU 220 became larger and two polygons, and DAU 248 became 
+smaller.  On the eastside, DAU 234 became smaller, and DAU 214 became larger. 
+In addition, a new column was added containing the California Planning Update  
+Area number.      
+
+
+
+
+