PREFACE

Part G of the manual covers the design of storm drains only. It presents the design criteria, standards, policies, and procedures to the new engineer and provides a reference source for the experienced designer. Other office or processing operations related to storm drain design are covered in other parts of the manual. The design of storm drains by City forces for the Los Angeles County Flood Control District or the State Division of Highways is not included in this manual.

GENERAL PROVISIONS

G 000 INTRODUCTION

Liability and Responsibility, Project Types and Agency Jurisdictions, Capital Improvement Projects, Assessment Projects, Private Development Projects, Easements Watercourses, Drainage Complaints.

G 100 GENERAL DESIGN

Policy, Design Practices, Types of Drainage Systems, Excavation and Backfill, Grading and Erosion Control, Soil Mechanics Nomenclature, Geological Nomenclature, Preliminary Study, Hydraulic Laboratory.

G 200 HYDROLOGIC DESIGN

Rainfall Frequencies from Rain Gages, General Criteria, Surface Flow, Peak Rate Method, Method of Summing Hydrographs, Method for Undeveloped Mountain Areas Hydrology for Reservoirs.

ALTERNATIVE METHOD :

LOS ANGELES COUNTY HYDROLOGY MANUAL
LOS ANGELES COUNTY SEDIMENTATION MANUAL

G 300 PRESSURE FLOW DESIGN

Design Procedure, Pre-Design Data, Hydrology and Alignment, Main Line Hydraulics, Catch Basin Design, Preliminary Plans, Construction Controls, Final Plans, Design Check Prior to Advertising for Bids.

G 400 FREE WATER SURFACE DESIGN

Geometric Design, Hydraulic Design, High Velocity Design-Sample Project.

G 500 STORAGE BASIN AND PUMPING PLANT DESIGN
Basic Design Data, Design of Storage Plus Gravity Outflow, Design of Storage Plus Pumping.

G 600 STORM DRAIN STRUCTURES

Conduits, Standard Structures, Special Structures, Appurtenant Construction.

G 700 PLAN PREPARATION

Standards, Title Sheet, Plan and Profile Sheets, Detail Sheets, Plan Processing and Construction.

G 800 CONSTRUCTION

Responsibilities and Relationships, Design Changes Prior to Contract, Duties During Construction, Change Orders, Final Inspection.

G 900 CULVERT DESIGN

Criteria, Culvert Operations, Hydraulic Design, Alignment and Structures.

INDEX

APPENDICES:
A. Hydraulic Properties of Streets-Office Standard No. 94
B. Design Charts for Catch Basin Openings-Office Standard No. 108
C. Hydraulic Analysis of Junctions-Office Standard No. 115
D. Hydraulic Properties of Pipe, Boxes, and Rectangular Channels-Office Standards Nos. 116 and 117
E. Maximum Allowable Flow in Streets - Office Standard No. 118
F. Hydraulic Model Study of Bicyle-Safe Catch Basin Grates