2006 hydrology manual los angeles

The software packages accepted by public works are found in chapter 15 of the 2006 hydrology manual available online at. Methodology the rational method and modified rational method are empirical computation procedures for. Usgs national hydrology datasets, and area reduction factors from. The software packages accepted by public works are found in chapter 15 of the 2006. Countywide construction contracting policy manual design manuals hydraulic design manual hydrology manual 2006 manual for preparation of.

The standards set forth in this manual govern all hydrology calculations done under public works jurisdiction. What is the difference between modrat and mora and if not significant difference, does ladpw will take analysis from mora. Seattle, washington, flow control technical requirements manual, november 2000. Rainfall distribution tables hydrocad stormwater modeling.

The bureau of engineering offers access to specific data to citywide users. There are runoff coefficient curves in the manual for each of the soil types. Oxford retention basin hydrology study in response to your request, a revised hydrologic analysis for oxford retention basin. Calgary canada stormwater manual, 2000 includes event definitions added in hydrocad10.

Before starting a hydrology study on the site indicated. Runoff rates were calculated for 50year storm events. Box 1460 alhambra, california 918021460 october 17, 2006. Contemporary and historical hydrologic analysis of. The rainfall at this specific project site is determined to be 6.

This section of the draft eir evaluates the impacts related to hydrology and water quality, and evaluates. Rainfall and soil characteristics for the project site are given in isohyetal map figure lacdpw 1hi. Each area was analyzed for acreage, impervious cover, and time of concentration according to the rational method. Precipitation, runoff, water levels and water conservation are detailed in annual reports developed electronically since water year 19571959. Publications ucla land surface hydrology research group. If you see a county storm drainage system in need of maintenance, contact the county department of public works field operations staff at 619 4431260 weekdays. Hydrologic map with aerial photograph showing existing drain alignment and. More detailed information related to class numbers. The burned runoff coefficients versus rainfall intensities. More detailed information related to class numbers and their meaning can be found.

However, please note that certain information may only be available to city employees. The burned runoff coefficients versus rainfall intensities were input into the modrat program as new soil types. Contains rainfall data, reservoir data, water conserve, spreading grounds, debris basins, runoff data, erosion control, evaporations and so much more. The format of these file is consistent with that defined in the modrat users manual. Before starting a hydrology study on the site indicated above. The standards set forth in this manual govern all hydrology calculations done. Hydrology and water quality sidewalk repair program draft environmental impact report 3. The manual contains current standards and procedures. The effect of forest roads and harvest on catchment hydrology in a mountainous maritime environment, in land use and watersheds. The standards set forth in this manual govern all hydrology calculations done under pub lic works jurisdiction. Wolfe, director 900 south fremont a venue alhambra, california 918031 telephone. The modrat and mora software programs both do modified rational hydrology calculations. Human influence on hydrology and geomorphology in urban and forest areas, water science and application, the american geophysical union, 2, 145164.

Shelbyville, in uses standard huff distributions, above. The rainfall isohyetal for the project site falls under 6. Hydrology the project site is located within the downtown newhall specific plan dnsp and within the proposed. Location and description of property figure 1 shows the proposed location of the proposed avanti south residential development. We assigned an impervious factor of 6% which is the same designation used by ackerman et al. The bureau of engineering is no longer using or accepting calculations using the base peak runoff method.

Drainage area a1 drains south into wilshire boulevard and drainage area a2 flows west into fairfax avenue. What is the difference between modrat and mora and if not. The proposed drainage and roof runoff will need to be collected and treated through effective uses of bmps such as a series of flowthrough planters. Technical info submitted by anonymous on january 26, 2017.