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USACE CWMS - Mill Creek Watershed


Authors: Mayss Saadoon
Owners: Mayss Saadoon · Jason Sheeley · Adrian Christopher
Resource type:Collection Resource
Created:Jun 27, 2018 at 12:50 p.m.
Last updated: Jun 27, 2018 at 1:20 p.m. by Mayss Saadoon

Abstract

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:
- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)
The Mill Creek area is characterized by wide seasonal variations in temperature and wide geographical variations in precipitation. Mill Creek Basin is in the belt of prevailing westerly winds and is largely under the influence of air from the Pacific Ocean. Occasionally, polar outbreaks of cold air spill over the Rocky Mountain barrier resulting in short periods of extremely low temperatures, but generally, winters are characteristically damp and foggy.
Mean annual precipitation for climate stations in the basin ranges from 17.8 inches at Walla Walla WB City, El. 948, in the lower portion of the basin, to 41.9 inches at Walla Walla 13 ESE, El. 2,400 (Refer to Tables 4-3 and 4-4). It is probable that at elevations above 5,000 feet, mean annual precipitation exceeds 50 inches. At Walla Walla, approximately 10 percent of the normal annual precipitation falls as snow; at higher elevations, this percentage is increased considerably, becoming approximately 40 percent at the 5,000-foot level. The normal annual precipitation for the basin is estimated to range from 35 to 40 inches above the project.
The general pattern of streamflow for Mill Creek consists of moderate to high flows from November through June and low flows from July through October. During years of low autumn precipitation and below normal winter temperatures, the period of low 4 - 9 flows may extend as late as February.
Major floods may be caused from any one of the following conditions: (1) intensive rainstorms, (2) a combination of rainfall and snowmelt, or (3) summer "cloudburst" thunderstorms. The winter flood period generally extends from December through February. Winter floods are flash-type floods that are relatively short in duration with peak discharges occurring in December through February. Historical floods of damaging magnitudes on Mill Creek have generally occurred in the winter and have been caused primarily by runoff from intense rainfall on snow with frozen ground or ground with a high soil moisture content. The spring snowmelt flood period generally extends from about the first of March through May. Peak discharges from snowmelt only runoff, rarely results in damaging stages. For the 1942-2005 period of record, the maximum mean daily discharge was 1,970 cfs on 23 December 1964 and the minimum mean daily discharge generally reaches zero in August. The largest historical flood outside of this period of record occurred on 1 April 1931 with an estimated peak discharge of 6,000 cfs.

Subject Keywords

Mill Creek Watershed,USACE,IWRSS,Corps Water Management System (CWMS)

How to cite

Saadoon, M. (2018). USACE CWMS - Mill Creek Watershed, HydroShare, http://www.hydroshare.org/resource/1100e67662b54fdb99b55e2e43794f07

This resource is shared under the Creative Commons Attribution CC BY.

 http://creativecommons.org/licenses/by/4.0/
CC-BY

Sharing status:

  • Discoverable Resource  Discoverable
  • Non Sharable Resource  Not Shareable

Coverage

Spatial:

 Coordinate System/Geographic Projection:  WGS84 EPSG:4326
 Coordinate Units:  [u'Decimal degrees']
North Latitude
46.3945°
East Longitude
-117.5361°
South Latitude
45.8626°
West Longitude
-119.0602°

Collection Contents

Add Title Type Owners Sharing Status My Permission Remove
USACE CWMS - Mill Creek Watershed CompositeResource Mayss Saadoon · Jason Sheeley · Adrian Christopher Discoverable Open Access
USACE CWMS - Mill Creek Watershed Bank Lines GeographicFeatureResource Mayss Saadoon · Jason Sheeley · Adrian Christopher Discoverable Open Access
USACE CWMS - Mill Creek Watershed Centerline GeographicFeatureResource Mayss Saadoon · Jason Sheeley · Adrian Christopher Discoverable Open Access
USACE CWMS - Mill Creek Watershed Conversion Points GeographicFeatureResource Mayss Saadoon · Adrian Christopher · Jason Sheeley Discoverable Open Access
USACE CWMS - Mill Creek Watershed Study Area GeographicFeatureResource Mayss Saadoon · Jason Sheeley · Adrian Christopher Discoverable Open Access

Authors

The people or organizations that created the intellectual content of the resource.

Name Organization Address Phone Author Identifiers
Mayss Saadoon U.S. Army corps of engineers
Extended Metadata
Name Value
USACE Model Registry USACEModelRegistryAdmin@usace.army.mil

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