2006 hydrology manual los angeles

Oxford retention basin hydrology study in response to your request, a revised hydrologic analysis for oxford retention basin. The rainfall isohyetal for the project site falls under 6. There are runoff coefficient curves in the manual for each of the soil types. The manual contains current standards and procedures, examples, runoff coefficient charts, and maps of rainfall isohyets and soil types. Calgary canada stormwater manual, 2000 includes event definitions added in hydrocad10. Hydrology and water quality sidewalk repair program draft environmental impact report 3. The bureau of engineering offers access to specific data to citywide users. We assigned an impervious factor of 6% which is the same designation used by ackerman et al. Location and description of property figure 1 shows the proposed location of the proposed avanti south residential development. Contains rainfall data, reservoir data, water conserve, spreading grounds, debris basins, runoff data, erosion control. The effect of forest roads and harvest on catchment hydrology in a mountainous maritime environment, in land use and watersheds. Technical info submitted by anonymous on january 26, 2017. The manual contains current standards and procedures. Box 1460 alhambra, california 918021460 october 17, 2006.

Seattle, washington, flow control technical requirements manual, november 2000. What is the difference between modrat and mora and if not. More detailed information related to class numbers and their meaning can be found. The modrat and mora software programs both do modified rational hydrology calculations. The software packages accepted by public works are found in chapter 15 of the 2006. The burned runoff coefficients versus rainfall intensities were input into the modrat program as new soil types. The format of these file is consistent with that defined in the modrat users manual. Wolfe, director 900 south fremont a venue alhambra, california 918031 telephone. This section of the draft eir evaluates the impacts related to hydrology and water quality, and evaluates. More detailed information related to class numbers. The burned runoff coefficients versus rainfall intensities. However, please note that certain information may only be available to city employees.

Postproject hydrograph modified from haltiner, 2006. Runoff rates were calculated for 50year storm events. Countywide construction contracting policy manual design manuals hydraulic design manual hydrology manual 2006 manual for preparation of. Human influence on hydrology and geomorphology in urban and forest areas, water science and application, the american geophysical union, 2, 145164. Rainfall distribution tables hydrocad stormwater modeling. Before starting a hydrology study on the site indicated above. Each area was analyzed for acreage, impervious cover, and time of concentration according to the rational method. Contemporary and historical hydrologic analysis of. Hydrology the project site is located within the downtown newhall specific plan dnsp and within the proposed. Report on the calibration analysis for the san diego county hydrology manual, may 2007 if you have trouble downloading the manual, please contact anthony barry at 8586942707. What is the difference between modrat and mora and if not significant difference, does ladpw will take analysis from mora.

The standards set forth in this manual govern all hydrology calculations done under public works jurisdiction. Methodology the rational method and modified rational method are empirical computation procedures for. The rainfall at this specific project site is determined to be 6. The standards set forth in this manual govern all hydrology calculations done. Precipitation, runoff, water levels and water conservation are detailed in annual reports developed electronically since water year 19571959. The standards set forth in this manual govern all hydrology calculations done under pub lic works jurisdiction. Contains rainfall data, reservoir data, water conserve, spreading grounds, debris basins, runoff data, erosion control, evaporations and so much more. Usgs national hydrology datasets, and area reduction factors from. Drainage area a1 drains south into wilshire boulevard and drainage area a2 flows west into fairfax avenue. The bureau of engineering is no longer using or accepting calculations using the base peak runoff method. Rainfall and soil characteristics for the project site are given in isohyetal map figure lacdpw 1hi. Shelbyville, in uses standard huff distributions, above. 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. The software packages accepted by public works are found in chapter 15 of the 2006 hydrology manual available online at.