Reference 2. Basis of Design(BOD) – Above Green

CALGreen Section 5.410.2.2, Basis of Design (BOD).

2.1 Intent:
The Basis of Design (BOD) describes the building systems to be commissioned and outlines design assumptions not indicated in the design documents. The design team develops the BOD to describe how the building systems' design meets the Owner's Project Requirements (OPR), and why the systems were selected. The BOD is most effective when developed early in the project design and updated as necessary throughout the design process.
2.2 Compliance Method:
Compliance requires the completion of the BOD document and should include the following where applicable:

Renewable Energy Systems
1. Provide narrative description of system—type, performance, control type, energy savings, payback period
2. Describe reason for system selection—why chosen system is better than alternatives, issues such as performance, efficiency, reliability, flexibility, simplicity, expandability, cost, payback period, utility company incentives, owner preference
3. Sequence of Operation—operating schedules, setpoints, storage capacity
4. Describe how system meets the OPR
Landscape Irrigation Systems
1. Provide narrative description of system—type, performance, water usage
2. Describe reason for system selection—why chosen system is better than alternatives, issues such as performance, efficiency, reliability, flexibility, expandability, cost, owner preference, simplicity
3. Sequence of Operation—operating schedules, setpoints
4. Describe how system meets the OPR
Water Reuse Systems
1. Provide narrative description of system—type, performance, capacity, reuse purpose
2. Describe reason for system selection—why chosen system is better than alternatives, issues such as performance, efficiency, reliability, flexibility, expandability, cost, owner preference, simplicity
3. Sequence of Operation—operating schedules, setpoints
4. Describe how system meets the OPR

2.3 Enforcement:
At their discretion, the building official confirms demonstrated compliance at Plan Intake by:

Receipt of a copy of the BOD document, or
Receipt of a form signed by the architect, engineer or designer of record, attesting that the BOD has been completed and meets the requirements of the OPR.