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Golden Harvest - Model GH-9000 -Constant Upstream Level Control Gates
The GH-9000 Level Control Gate by Golden Harvest is engineered to automatically maintain a consistent upstream water level regardless of discharge changes, all while minimizing head loss. Utilizing force-balance control, this system operates without external power and requires no manual intervention post-initial setup. It's designed to handle a wide range of flow control requirements, from minimal flows to up to 2000 cubic feet per second. The gate reacts dynamically to changes in flow, closing near zero discharge and opening as flow increases. The GH-9000 proves to be economically beneficial over its lifecycle, as it negates costs associated with PLC relays, actuators, and maintenance, making water distribution networks both simplified and efficient. This system eliminates the need for manual adjustments by ditch riders and minimizes the risks of bank overtopping, ensuring a precise and adaptable water management system year-round.
- Self-adjusting Design Requires No Motors or Outside Power Source
- Maintains Accurate, Constant Upstream Levels
- 21 Standard Sizes to Fit Most Flow Requirements
- For Flood Control, Water Management Systems, Irrigation, Flow Equalization, UV Level Control and Clarifier Odor Control in Water and Wastewater Treatment
The Golden Harvest, Inc. Model GH-9000 Level Control Gate utilizes force-balance control to automatically maintain a constant upstream water level at any given discharge while minimizing head loss.
Sizes and materials of construction are available to meet a wide variety of flow control needs ranging from almost zero to 2000 cfs. The gate nearly closes at low discharge and progressively opens as the flow increases.
The level control gate operates completely free of outside power and after initial adjustment absolutely no manual intervention is required. While the initial purchase cost is competitive with other systems the GH-9000 offers substantial life cycle cost benefits. The costs associated with PLC relays, modulating actuators, maintenance, replacement and energy are relieved.
Water distribution networks utilizing the GH-9000 become simplified and cost effective as ditch riders are no longer required to periodically adjust gates or manipulate flash boards at GH-9000 check structures. Thus, a more accurate and flexible distribution system is made available, reducing costly time and water waste. In addition, damage due to overtopping of banks is eliminated as the level control gates operate instantly year round to relieve or maintain a wide range of flows.
The automatic level control gate shall be constant upstream level, GH-9000, and be completely self operating with an integrated float ballast design. The gates shall be manufactured by Golden Harvest, Inc., Burlington, WA.
Gates shall automatically control the level upstream of the gates irrespective of the flow through the gates and independently of the downstream water surface elevation, as long as the difference between the controlled water surface elevation and the downstream water surface elevation equals or exceeds the minimum amount stated in the operation requirements below:
- Maximum upstream water elevation
- Maximum flow
- Minimum head differential
The gates shall use force balance principle to control flow. The hydraulic force of the water flow against the gates shall be counter-balanced by buoyant chamber and ballast chambers. No motors or electrical devices, cable and pulley arrangements, or float wells shall be employed in the operation of the gates.
The level control gate shall mount in a prefabricated control structure.
Construction
The gates shall be constructed of 304L stainless steel plate and shapes, and designed to withstand the pressure forces produced by the upstream water level at its maximum elevation, with no tail-water.
The gates shall mainly consist of a radial shaped faceplate, suitably reinforced and matching trapezoidal shape sluiceway, a framework including the float and ballasting compartments.
The gates shall include an adjustable counterweight, suitable for accurate, sensitive and stable gate operation.
Option: Prefabricated Control Structure
The prefabricated control structures shall be constructed of type 304L stainless steel.
Installation
In accordance with the manufacturer`s written instructions.
The gate shall be carefully checked and adjusted to tolerances required in the factory for straight forward field erection and proper operation.
Field adjust ballast in ballast chambers to adjust upstream water level to the desired depth. Contractor to provide the required ballast for each gate.
Accurately place anchor bolts using dimensions furnished by the manufacturer and as specified.
Field Test
A functional test shall be completed by means of varying flow to each gate from minimum to full plant flow. Upstream water levels shall be recorded and if necessary each gate shall be adjusted for satisfactory performance.
Manufacturer`s Service
A manufacturers factory representative shall be present at the jobsite for inspection of installation, functional testing, ballast adjustment and certification.