WSP02258

• File Number: 8449.750
• Description: Tri-Lakes ‎(Cherry Creek, Bear Creek, Chatfield)‎
• State: CO
• Basin: South Platte
• Date: 3/1/1996
• Author: USACOE
• Title: Water Supply Handbook "Storage Reallocation"
• Water Supply Pro - Doc Type: Publication

4-2

Chapter 4 - Reallocations

B.

REALLOCATION OPPORTUNITIES

1. Reservoirs.

a. Mul tipuroose Pools. A typical multipurpose reservoir
consists of a three pools; a flood control pool, a conservation
pool, and an inactive or sediment pool. The flood control pool is
normally kept empty to permit storage of runoff during times of
high inflow. The conservation pool can consist of dedicated
storage for one or more of the following the following purposes;
hydropower, navigation, water supply, water quality, or irrigation.
Recreation can also have dedicated storage, but in most all Corps
multipurpose reservoir projects, the recreation feature utilizes
the top of the multiple purpose pool. The inactive or sediment
pool is generally not available to meet downstream water needs as
it is normally storage set aside for hydropower head and/or to
store the sediment that is expected to accumulate over the life of
the project.

b. TYPes of Reallocations. Opportunities to reallocate
storage in Corps reservoirs from an authorized purpose to M&I water
supply was the subject of a study performed by the Institute for
Water Resources. The study, Opportunities For Reservoir Storage Reallocation, IWR
Policy Study 88 -PS-2, dated July 1988, documents eight
opportunities available for reallocation. These are:

(1). Use of water supply storage not under contract;

(2). Temporary use of storage allocated for future
conservation purposes and sediment;

(3). Storage made available by change III conservation
demand or purpose;

(4). Seasonal use of flood control space during dry season;

(5). Reallocation of flood control space;

(6). Modification of reservoir water control plan and
method of regulation;

(7). Raising existing dam; and

(8). System regulation of Corps and Non-Corps reservoirs.

c. Limits of this Chapter. This chapter limits of study of
reallocations to those that permanently transfer storage from
another authorized use (flood control, hydropower, other
conservation, or sediment) to M&I water supply.