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 format of these file is consistent with that defined in the modrat users manual. The standards set forth in this manual govern all hydrology calculations done under pub lic works jurisdiction.
The rainfall isohyetal for the project site falls under 6. Countywide construction contracting policy manual design manuals hydraulic design manual hydrology manual 2006 manual for preparation of. Each area was analyzed for acreage, impervious cover, and time of concentration according to the rational method. Wolfe, director 900 south fremont a venue alhambra, california 918031 telephone. The burned runoff coefficients versus rainfall intensities were input into the modrat program as new soil types. 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. Drainage area a1 drains south into wilshire boulevard and drainage area a2 flows west into fairfax avenue. Runoff rates were calculated for 50year storm events. The software packages accepted by public works are found in chapter 15 of the 2006.
The effect of forest roads and harvest on catchment hydrology in a mountainous maritime environment, in land use and watersheds. The rainfall at this specific project site is determined to be 6. Location and description of property figure 1 shows the proposed location of the proposed avanti south residential development. Calgary canada stormwater manual, 2000 includes event definitions added in hydrocad10. Before starting a hydrology study on the site indicated above. More detailed information related to class numbers. Contains rainfall data, reservoir data, water conserve, spreading grounds, debris basins, runoff data, erosion control. Methodology the rational method and modified rational method are empirical computation procedures for. Precipitation, runoff, water levels and water conservation are detailed in annual reports developed electronically since water year 19571959. Seattle, washington, flow control technical requirements manual, november 2000.
The burned runoff coefficients versus rainfall intensities. Publications ucla land surface hydrology research group. Contains rainfall data, reservoir data, water conserve, spreading grounds, debris basins, runoff data, erosion control, evaporations and so much more. Contemporary and historical hydrologic analysis of. We assigned an impervious factor of 6% which is the same designation used by ackerman et al.
What is the difference between modrat and mora and if not significant difference, does ladpw will take analysis from mora. Hydrology and water quality sidewalk repair program draft environmental impact report 3. However, please note that certain information may only be available to city employees. Oxford retention basin hydrology study in response to your request, a revised hydrologic analysis for oxford retention basin. Usgs national hydrology datasets, and area reduction factors from. The bureau of engineering is no longer using or accepting calculations using the base peak runoff method. The manual contains current standards and procedures. Rainfall and soil characteristics for the project site are given in isohyetal map figure lacdpw 1hi. Box 1460 alhambra, california 918021460 october 17, 2006. The bureau of engineering offers access to specific data to citywide users. Hydrologic map with aerial photograph showing existing drain alignment and.
There are runoff coefficient curves in the manual for each of the soil types. Postproject hydrograph modified from haltiner, 2006. Shelbyville, in uses standard huff distributions, above. Before starting a hydrology study on the site indicated. The software packages accepted by public works are found in chapter 15 of the 2006 hydrology manual available online at. Human influence on hydrology and geomorphology in urban and forest areas, water science and application, the american geophysical union, 2, 145164. The standards set forth in this manual govern all hydrology calculations done. F6, the existing stormwater runoff rate at the project site is approximately 152. Technical info submitted by anonymous on january 26, 2017. Hydrology the project site is located within the downtown newhall specific plan dnsp and within the proposed. Rainfall distribution tables hydrocad stormwater modeling.195 723 598 1571 582 374 264 1199 722 386 152 1585 1507 1357 428 1156 1522 444 643 735 386 560 644 956 993 439 249 758 981 688 1200 1396 1284 340 1441 1497 196 752 464 823 1439